Color depth describes the maximum amount of colors an image can contain.. 32 bit images can contain over a billion colors; however, the final 8 bits of the image are commonly reserved fo
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Trang 3Table of Contents
CHAPTER 1 – DIGITAL GRAPHICS 1
The RGB Color Space 2
Image Resolution & Color Depth 2
Image Types 3
Bitmap Images 3
Vector Images 3
File Types 5
GIF Format 5
JPEG Format 6
PNG Format 6
Review Questions: Digital Graphics 7
CHAPTER 2 – THE PHOTOSHOP ENVIRONMENT 9
The Photoshop Workspace 10
Photoshop’s Menus 11
File 11
Edit 11
Image 11
Layer 11
Select 11
Filter 11
View 12
Window 12
Help 12
The Toolbox 13
Adobe Online 14
Painting Tools 14
Type Tool 15
Measure Tool 15
Gradient Tool 15
Paint Bucket Tool 15
Eyedropper Tool 15
Hand Tool 15
Zoom Tool 15
Foreground/Background Colors 15
Edit Mode 16
Screen Mode 16
Jump 16
Trang 4Table of Contents
Palettes 17
Navigator Palette 17
Info Palette 18
Options Palette 18
Color Palette 18
Swatches Palette 19
Brushes Palette 19
History Palette 19
Actions Palette 20
Layers Palette 20
Channels Palette 20
Paths Palette 21
Setting Preferences 21
Preferences - Units & Rulers 22
Preferences – General 23
Preferences - Saving Files 25
Preferences - Display and Cursors 26
Preferences - Transparency & Gamut 27
Preferences - Guides and Grid 28
Preferences - Plug-Ins & Scratch Disks 29
Preferences - Memory & Image Cache 30
ImageReady 31
Review Questions: The Photoshop Environment 32
CHAPTER 3 – CREATING NEW IMAGES 34
Creating New Images 35
Name 35
Width & Height 35
Resolution 36
Mode 36
Contents 36
Image Window 37
Scanning Images into Photoshop 38
Importing Existing Images into Photoshop 39
Open Dialog Box 39
Image Mode 39
Magnification/Navigation Controls 41
Navigator Palette 41
Zoom Tool 42
Trang 5Table of Contents
Hand Tool 42
The History Palette 42
The Snapshot 42
The State 42
Maximum History States 43
Automatically Create First Snapshot 43
Allow Non-Linear History 43
Review Questions: Creating New Images 45
CHAPTER 4 – USING SELECTIONS AND CHANNELS 47
Selections and Channels 48
Selection Tools 48
Marquee Tool 48
Multiple Selections 49
Modifying Selections 49
Info Palette 50
Moving Selections 50
Lasso Tool 51
Options Palette 52
Feather 52
Style 53
Lasso Width 54
Frequency 54
Edge Contrast 54
Magic Wand Tool 54
The Pen Tool 55
Direction Selection Tool 55
Convert Point Tool 55
Add/Delete Anchor Point Tools 56
Freeform Pen Tool 56
Magnetic Pen Tool 56
Creating a Selection from a Path 56
Creating Selections in Quick Mask Mode 57
Quick Mask Options 57
Creating a Selection with Color Range 58
Color Range Dialog-Box 58
Saving Selections with the Channel Palette 60
Trang 6Table of Contents
Color Channels 60
Alpha Channels 61
Restoring Your Selection 62
Load Selection Dialog Box 62
Review Questions: Using Selections and Channels 64
CHAPTER 5 – USING LAYERS 67
Layers 68
Layers Palette 69
Layers 69
Using Layers 71
Transparency 71
Moving Layers 71
Blend Modes 71
Preserve Transparency 72
Layer Masks 72
Transforming Layers 74
Creating New Layers 74
Text and Layers 75
Layer Effects 76
Managing Layers 77
Changing the Stacking Order 77
Duplicating Layers 77
Merge Options 77
Review Questions: Using Layers 78
CHAPTER 6 – EDITING IMAGES 81
Using the Painting and Drawing Tools 82
Color Palette Group 82
Brushes 82
Swatches 83
Color Palette 83
Airbrush Tool 84
Airbrush Options 84
Trang 7Table of Contents
Paintbrush Tool 85
Paintbrush Options 85
Rubber Stamp Tool 86
Rubber Stamp Options 86
Pattern Stamp Tool 87
History Brush Tool 87
Art History Brush 89
Art History Brush Options 89
Eraser Tool 90
Eraser Tool Options 90
Background Eraser Tool 91
Background Eraser Options 91
Magic Eraser Tool 92
Pencil Tool 92
Line Tool 92
Line Tool Options 92
Blur Tool 93
Sharpen Tool 93
Smudge Tool 93
Dodge Tool 93
Burn Tool 93
Sponge Tool 93
Gradient Tool 94
Gradient Tool Options 94
Gradient Editor 95
Paint Bucket Tool 96
Using the Type Tool 96
Type Tool Dialog Box 96
Using Filters 99
Applying Filters 99
Trang 8Table of Contents
Fine-Tuning Filters with Fade 100
Adjusting Images 101
Histogram 101
Channel 101
Mean, Std Dev, Median, Pixels 101
Level, Count, Percentile, Cache Level 102
Using Levels 103
Channel 103
Input Levels/Input Levels Sliders 103
Output Levels/Output Levels Sliders 104
Levels Eyedropper Tools 104
Auto 104
Preview 104
Auto Levels 104
Auto Contrast 104
Curves 105
Color Balance 107
Color Balance Fields and Sliders 107
Tone Balance 107
Preserve Luminosity 107
Brightness/Contrast 108
Hue/Saturation 108
Desaturate 108
Replace Color 109
Selective Color 110
Channel Mixer 110
Invert 110
Equalize 110
Threshold 111
Posterize 111
Variations 111
Trang 9Table of Contents
Adjustment Layers 112
Using Guides and the Grid for Alignment 112
Using Guides 112
Using the Grid 113
Review Questions: Editing Images 114
CHAPTER 7 – CREATING STATIC IMAGES FOR THE INTERNET 118
Creating a Logo in Photoshop 119
Importing Vector Based Logo Files 119
Preparing the Logo for the Internet 121
Save for Web 123
Preview Windows 123
Compression Options 124
Building Compression Options 124
Compressing Photographic Images 125
JPEG Compression 126
Compression Levels 126
Creating a Custom Logo 127
Review Questions: Creating Static Images for the Internet 132
CHAPTER 8 – CREATING BANNERS AND ANIMATED GIFS 134
Banner Dimensions and Restrictions 135
Creating a Static Banner 135
Creating an Animated GIF Banner 138
The ImageReady Environment 138
The Animation Palette 139
Frame Thumbnails 139
Frame Controls 139
Animating in ImageReady 140
Review Questions: Creating Banners and Animated GIFs 143
CHAPTER 9 – CREATING BUTTONS AND ROLLOVERS 145
Trang 10Table of Contents
Creating Buttons with ImageReady 146
Button Size 146
New Document 146
The Rectangle Tool 147
Rectangle Options 147
Rounded Rectangle Options 148
Ellipse Tool Options 148
Styles Palette 149
Creating Custom Styles 149
ImageReady’s Type Tool 150
Centering Layers 151
Creating Rollovers 152
Rollover Palette 152
HTML Options 154
Tags Case 155
Indent 155
Attribs Case 155
Line endings 155
Always Quote Attributes 155
TD W, H 155
Spacer Cells 155
Empty Cells 155
Include Comments 155
Image Maps 155
Code 156
Photoshop’s Menus 156
Compatibility 156
Background Image 156
Subfolder 156
Copyright 157
Review Questions: Creating Buttons and Rollovers 158
CHAPTER 10 – CREATING NAVIGATION BARS 160
Tables and HTML Layout 161
Creating a Navigation Bar 161
Slices 164
Trang 11Table of Contents
Slice Tool 164
Slice Select Tool 164
Slice Palette 165
Type 165
Name 165
URL 165
Target 165
BG 165
Optimizing Slices 166
Image Maps 166
Creating Image Maps 166
Review Questions: Creating Navigation Bars 168
CHAPTER 11 – CREATING WEB PAGES WITH IMAGEREADY 170
Creating a Web Page with ImageReady 171
Web Page Dimensions 171
Navigation Bar 172
The Logo 174
Corporate Headquarters 175
Using Slices for Layout 178
Optimize Slices 180
Review Questions: Creating Web Pages with ImageReady 182
Trang 121 Digital Graphics
In this chapter you are introduced to the nature of computer generated
images as well as Internet browser image standards
Objectives
Upon completing this section, you should be able to:
1 Understand resolution and color depth
2 Differentiate between bitmap and vector graphics
3 Explain standard image file-types for the Internet
Trang 13
The RGB Color Space
Computer displays are made up of individual dots or units called pixels placed in rows and columns, like a chart or grid Each pixel can be one of up to 16 millions colors Essentially your computer has a palette that holds a swatch or blob of red paint, green paint, and blue paint By mixing these colors together, other colors are created Because Red, Green, and Blue are a computer’s primary or
fundamental colors, computer displays are said to operate in the RGB (Red, Green, Blue) color space or spectrum Each primary color is made up of 256 individual values or shades (measured from 0 – 255.) By mixing Red at a value
of 190, Green at a value of 81, and Blue at a value of 14 for instance, we get a dark orange color Mixing all the colors together at a level of 0 produces black Red, Green, and Blue all set to a value of 255 produces white
Image Resolution, Dimensions, and Color Depth
Resolution in digital imagery refers to pixels per inch (ppi) or density, similar to how many square feet a particular room in a house might have Currently,
computer displays are limited to a range of 72 to 96 ppi For the web, 72 ppi is the standard Increasing the density is practical only for images intended for print and results in large file sizes which in turn result in longer download times
The amount of pixels contained in the width and height of an image is referred to
as an image’s dimensions For instance, an image might be 320 pixels wide by
200 pixels high (commonly expressed as 320x200.) Image dimension is a key element of web design Currently computers have a common group of fixed desktop dimensions ranging from 640x480 to 1280x1024 or higher Web sites are usually designed “resolution-safe” meaning to the lowest common
denominator, a desktop display at 640 pixels wide by 480 pixels high (640x480) Within the browser itself a width of 600 pixels is the common limit This ensures that everyone viewing web sites with image capable browsers will be able to view your site
Color depth describes the maximum amount of colors an image can contain The number of colors an image contains is dependent on the image’s bit-depth Confused? When users describe an image’s color depth, they might also
describe it in terms of bit-depth The higher the bit value the more colors the image can contain
Trang 14Images are made up of one of four standard bit depths: 1 bit, 8 bit, 24 bit, and 32 bit A 1-bit image consists of either black or white, or two colors 8 bit images contain a maximum of 256 colors or 256 shades of gray 24 bit images contain a maximum of 16 million colors 32 bit images can contain over a billion colors; however, the final 8 bits of the image are commonly reserved for alpha channel information rather than color Alpha channels are covered later
Image Types
In addition to resolution and color depth, images are also distinguished by the type or kind of image it is There are two primary image types, bitmaps and vectors
Bitmap Images
Bitmap images are the most common type of image file Bitmap files map out or plot the image pixel by pixel Think of a grid once again, where each square represents each pixel in the image The image file basically describes each pixel, such as pixel 300 wide by 250 high is red Pixel 301 wide by 250 high is also red Pixel 302 wide by 250 high is yellow and so on The larger the image and the greater the color or bit-depth the larger the file size Because bandwidth is a major concern when developing web sites keeping the size of your images to a minimum is very important The main benefit of bitmap images is photographic color, tone, and texture are accurately produced
Vector Images
Vector images do not plot images on a pixel-by-pixel basis Instead vector files contain a description of the image expressed mathematically Essentially the file tells the computer about the image and the computer draws it For instance, an image of a red circle in vector format, written in plain English, might look
something like this:
• Draw a circle
• Radius is 2 inches
• Color is red
Trang 15The main benefit of vector images is there file size, particularly relative to the file size of bitmap images Imagine the same circle in a bitmap file In plain English
it might look something like this:
o Pixel 2x2 is white, etc
As you can see, describing the circle, and the color surrounding it, on a pixel basis is a much more laborious and lengthy process than telling the
pixel-by-computer to draw the circle itself
Unfortunately, vector images, because they describe images in terms of shapes, lines, curves, points, colors, length, etc., cannot reproduce photographic images Vectors are limited to images with continuous tones and definitive outlines Furthermore, with the exception of Macromedia’s Flash vector format, vector images are not yet supported by web browsers Vector support is coming to the Internet in the form of the Scalable Vector Graphics format For information, consult http://www.w3.org/Graphics/SVG/
Photoshop is a bitmap image editor It can, however, load or import vector based images On import Photoshop translates the vector description and a bitmap image is created Importing vector images is covered in detail later
Trang 16File Types
Bitmap files, at the most basic or fundamental level, are just as described, a map
or plot of each individual pixel However, image files can and often do contain other information depending on their use For instance, the author or creator of the image might be included, as well as the date and copyright information In addition, because bitmaps tend to be large, various methods of compression or methods to reduce file size have been developed To designate extra
information and compression methods, different file types have been developed File type is not the same as image type where the image is either a bitmap or a vector File type designates a particular variety of bitmap or even a particular variety of vector With Windows the file type is usually identified by adding a period followed by three letters to the end of the filename, as in “circle.gif” or
“circle.jpg.” This is called a file extension On the Macintosh file extensions are not used to designate file types A file designating the file type and the
application that created it is attached to the image file instead However, Web servers and browsers also use file type extensions so it is advisable that
Macintosh users do the same for images generated for the web
Web browsers currently support three image file types They are gif, or
Graphics Interchange Format (GIF), jpg or Joint Photographic Experts Group (JPEG), and png or Portable Network Graphics (PNG.)
GIF Format
Graphic Interchange Format (.gif) uses a maximum of 256 colors (8-bit color depth) and uses combinations of these to simulate colors beyond that range The GIF format is best for displaying images such as logos, icons, buttons and other images with uniform colors and tones
GIF images come in two different versions and have some extra functionality that JPEGs do not You can save GIF images in GIF 87 or GIF 89a format (the
extension gif remains the same.) GIF 89a has the following features that GIF 87 and JPEG files do not:
Transparency
With GIF 89a format images you can set a single color to be transparent, that is,
it will allow the background color or image to show through it, similar to using a
Trang 17blue screen in cinema Transparency is most commonly used to make the
rectangular background canvas of an image invisible; this feature can be very effective in web page design
Animated GIFs
GIF 89a images can also be animated Animated GIF images are simply a number of GIF images saved into a single file and looped Netscape Navigator and Microsoft Internet Explorer both display animated GIFs, but many other browsers cannot, and may not be able to display even the first image in the loop Animated GIFs also take longer to download, therefore use animated GIFs with caution
JPEG Format (JPEG, JPG)
Joint Photographic Expert Group is the best format for photographs because JPEG files contain millions of colors (24-bit color space.)
JPEG images do not support transparency or interlacing, but Photoshop allows you to specify the degree of file compression so you can create a balance
between image quality and file size JPEG compression for the web is covered
256 colors (8-bit color depth) and PNG-24 can have up to 16 million colors (24-bit color depth.) Unfortunately, neither Netscape Navigator nor Microsoft Internet Explorer offers full support for PNG images As a result, using PNG images for your web site at this time is not recommended
Trang 18Review Questions
1 What are the primary colors computers mix to create other colors?
2 What are the primary image types and how do they differ?
3 Color depth is also referred to as?
4 What file types are currently supported by Netscape Navigator and
Microsoft Internet Explorer?
5 Why would you choose to use a JPEG image type instead of a GIF image type?
Trang 19Summary
As a result of this chapter, you should be able to:
• Understand resolution and color depth
• Differentiate between bitmap and vector graphics
• Explain standard image file-types for the Internet
Trang 202 The Photoshop Environment
This chapter introduces you to Photoshop’s workspace Photoshop’s
tools, menus, palettes and preferences are summarized
This section contains a lot of information It’s important to familiarize
yourself with the Toolbox and the Palettes before proceeding with the rest
of the material You might find the Preferences information of additional value after you’ve mastered Photoshop’s workspace The two most
important Preferences are Units & Rulers
Objectives
Upon completing this section, you should be able to:
1 Identify Photoshop’s default tools, menus, and palettes
2 Customize Photoshop’s environment
3 Set preferences specifically for Web development
4 Understand the relationship between Photoshop and ImageReady
Trang 21The Photoshop Workspace
When you first open or start Photoshop the work area is made up of a set of default or standard Tools, Palettes and menus Photoshop’s Tools are contained
in the Toolbox Each Tool has a set of properties or features that you can
modify These properties are contained in what are called Palettes For
instance, when you select the Paintbrush tool you use the Brushes Palette to select the size of the brush and the Options Palette to modify or affect how the brush operates Palettes also contain other functions unrelated to Photoshop’s tools, such as advanced image manipulation tools Photoshop’s menus, like most standard applications, run along the top of the workspace
Trang 22Edit
The Edit menu contains options to copy, cut, and paste entire images or parts of images, fill areas of an image, stroke selections or paths (covered in depth in later chapters) and transform or modify images
Image
The Image menu contains options to modify color depth or mode, manipulate or adjust color and other image properties, modify image size, canvas size and orientation, examine color information and extract areas of an image from
Select
The Select menu contains options to create, modify and manipulate Photoshop’s selections Selections are areas of an image that you choose to isolate from the rest of the image For instance, you might want to isolate a person’s hair to change the color without affecting the rest of the image
Filter
The Filter menu contains a variety of different special effects, called Filters that you apply to an image or parts of an image For instance, you might have an
Trang 23image of a runner By applying the Motion Blur filter to the image, you create a greater sense of speed
View
The View menu contains options to modify viewing your image, including
zooming in and out and how images might look when printed or viewed on
another computer In addition, options to view rulers and guides are available to aid in editing your images
Window
The Window menu contains options to view and/or hide the Toolbox and Palettes
as well as options to organize images within Photoshop’s workspace
Help
The Help menu contains options for online help, information about plugins and information about the version of Photoshop you are using Use “Help Topics” for reference or finding out how to accomplish objectives you might be having
problems with
Trang 25The Marquee, the Move, the Lasso, the Magic Wand, and the Pen Tool make up Photoshop’s Selection Tools Selections are areas of an image you wish to isolate in order to modify it, such as changing the color of someone’s hair A Marquee, a dotted line in constant motion, represents the shape of your
selection The Marquee is also known as a selection path
Painting Tools
Airbrush Paintbrush Rubber Stamp Art History Eraser Pencil Blur Dodge
The Airbrush, Paintbrush, Rubber Stamp, Art History Brush, Eraser, Pencil, Blur, and Dodge Tools make up Photoshop’s Painting Tools Use the Painting Tools
to create or modify images, recolor images, clone parts of images and other paint and drawing effects
Trang 26toward the horizon
Paint Bucket Tool
The Paint Bucket Tool effectively pours a solid color of your choice into a
designated area of an image The Paint Bucket replaces or paints over the color
you {Click} on You can also set the Paint Bucket to paint over colors within a
certain range, such as pink to red
The Eyedropper Tool is used to sample color from an image {Click} the
Eyedropper over the color you wish to select The color you choose to sample becomes the current Foreground color
Hand Tool
The Hand Tool is used to move areas of a magnified image around For
instance, Photoshop allows you to zoom in to specific areas of an image
However, when you do that, other areas of the image are no longer visible By using the Hand Tool, you can grab and shift the image to bring other sections under the magnified area
Zoom Tool
The Zoom Tool is used to get closer too or magnify particular areas of the image, useful for precise image editing and manipulation
Foreground/Background Colors
Trang 27The currently selected Foreground color, or color you are currently painting with
is displayed in the Foreground Color box By default, the Foreground Color is black
The currently selected Background color is displayed in the Background color
box By default, the Background color is white {Click} the Default Colors icon to
restore or return the Foreground and Background colors to default black and
white To switch the Foreground and Background colors {Click} the Swap Arrow
Edit Mode
Photoshop works in Standard Edit Mode and Quick Mask Edit Mode To work in
either mode {Click} the Standard or Quick Mask button Editing modes are
covered in depth in later chapters
Screen Mode
Photoshop has three primary Screen Modes, Standard Screen Mode, Full
Screen Mode with Menu Bar, and Full Screen Mode By default, Photoshop starts in Standard Screen Mode Selecting Screen Mode with Menu Bar pushes Photoshop’s Main Menu to the top of the screen Selecting Full Screen Mode eliminates the Main Menu entirely
Jump (to Default Graphics Editor Application)
Clicking this button transfers the currently edited image into another graphics program of your choice The default application is Adobe ImageReady 2.0, an integral part of Photoshop 5.5
Trang 28Palettes
Photoshop stores many of the modifiers or options for Tools and image
manipulation in Palettes Palettes are a collection of commonly used options and functions made available by a mouse-click or two away Essentially even the Toolbox is a Palette By default, Photoshop starts with 11 Palettes organized or grouped into four Palette sets
• Palette Set 1 consists of the Navigator, Info, and Options Palettes
• Palette Set 2 consists of the Color, Brushes, and Swatches Palettes
• Palette Set 3 consists of the History and Actions Palettes
• Palette Set 4 consists of the Layers, Channels, and Paths Palettes
Palettes are said to be “floating” because, like the Toolbox, you can {Click} and
drag them to any location on screen Furthermore, Palettes can be grouped
together or pulled apart by {Clicking} on the Tabs and dragging them out of or into any Palette Set you desire For instance, you can {Click}, hold and drag the
Navigator Palette out of Set 1 and drop it into Set 2 Alternately you can simply drag the Navigator Palette out of its default group and drop it on screen to make
a Palette Set of one
To close a Palette or Palette Set {Click} on the close icon at the top right corner
To restore a Palette you have closed select the desired Palette from the Window pull-down menu
Many of the functions Palettes feature are covered in depth in later chapters What follows is a summary of the default Palettes to familiarize you with
Photoshop’s environment
The Navigator Palette
Use the Navigator Palette to quickly zoom into (magnify) or zoom out from your image
Trang 29The Info Palette
As you pass the pointer over an image the Info Palette displays color and
coordinate information When using any of the Selection Tools the Info Palette also displays the width and height of the selection
The Options Palette
The options listed in the Options Palette change depending on the Tool you are using For instance, when using the Airbrush Tool the Options Palette includes items to change the brush Pressure, the Paint mode, and how many Steps are used before the brush Pressure drops to a value of zero Options or modifiers for Tools are examined in Chapters 3 and 4
The Color Palette
The Color Palette is used to create new colors Select the box (called a swatch)
you wish to make the color change to by {Clicking} on it The swatch at the top is
the Foreground color and the swatch beneath it is the Background color, as in
the Toolbox {Click} and drag the sliders side to side beneath either the R (Red),
Trang 30G (Green), and B (Blue) bar until you create the color you wish Alternately you can manually enter the color values in the text boxes beside the color bars
The Swatches Palette
The Swatches Palette contains a number of pre-created colors to choose from You create your own Swatches with your favorite colors as well as load other color sets Photoshop includes a color set of web-safe swatches, a collection of colors that both Netscape Navigator and Microsoft Internet Explorer support as standard
The Brushes Palette
The Brushes Palette contains a number of pre-built or pre-set brushes of different sizes and shapes You can build your own brushes as well
The History Palette
The History Palette makes a record of all the changes you make to your image
If you’re not satisfied with a change or series of changes you can use the History Palette to restore your image as it was before the undesired changes Similar to Undo you find in other programs
Trang 31The Actions Palette
The Actions Palette is used to automate repetitive tasks Automated Tasks are called Actions
The Layers Palette
The Layers Palette is used to create, manipulate and modify Layers Layers are covered in depth in later chapters
The Channels Palette
The Channels Palette is used to create, manipulate and modify Channels Channels are covered in depth in later chapters
Trang 32The Paths Palette
The Paths Palette is used to create, manipulate and modify Paths Paths are covered in depth in later chapters
Setting Preferences
In addition to customizing the look and feel of Photoshop’s workspace, you
should also set Photoshop’s preferences before you begin using the program
{Click} “File” and select “Preferences/Units & Rulers” from the pull-down menu
Customize or change your Preferences by selecting the Preference type from the drop-down menu Photoshop currently has a number of preferences unrelated to web development that we will not explore What follows is a list of Photoshop’s preferences and recommendations to optimize Photoshop for web development
We begin with Units & Rulers to ensure that you use pixels rather than inches as your standard unit of measurement You may want to return to the other
Preferences settings as you proceed through the material Until you familiarize yourself with Photoshop’s environment and some of it functions and features, the purpose of some of the Preferences might not be readily apparent Feel free to proceed to the next chapter
Trang 33Preferences - Units & Rulers
Units
Select Pixels Pixels are the recommended measurement as they are the standard unit for web site development Other options relate to images created for Print
Trang 34Check Anti-alias Postscript to make the edges of imported vector graphics
appear smooth Anti-aliasing compares the color of the edge of an image, such
as the outline around a circle, with the color the edge sits against and creates a color in between that makes the transition from one to the other smooth For instance, you might have an image of a black circle sitting on a white
background The edge of the circle, if not anti-aliased will appear jagged With anti-aliasing enabled, Photoshop will surround the black edge with a very light gray or grays so that the contrast between the background and edge is not so pronounced As a result, the edge of the circle appears smooth
Trang 35Export Clipboard
Check Export Clipboard if you want images or selections you have copied made accessible to other programs Similar to cut and pasting text from a word
processor to an HTML document for instance
Uncheck Short Pantone Names
Uncheck Short Pantone Names This is an option for Print production and will not be covered You may need to match colors with a client’s corporate color set, in which case you may need to use Pantone color Using Pantone color is covered in Chapter 4: Editing Images
Show Tool Tips
Check Show Tool Tips if you want to see the name and Keyboard shortcut of each Tool when you roll the mouse over the tool
Auto-update open documents
Check Auto-update open documents if you want Photoshop and ImageReady to automatically update changes you have made to an image in one application when you switch to the other This option is covered in depth in Chapter 4:
Editing Images
Beep When Done
Check Beep When Done if you want Photoshop to beep when it has completed a task, such as applying a filter to an image
Dynamic Color Sliders
Check Dynamic Color Sliders to make the color bars in the Color Palette update
as you move the sliders back and forth
Save Palette Locations
Check Save Palette Locations to make Photoshop remember where you’ve placed your palettes and the toolbar When you open Photoshop again your setup will be the same
Show Font Names in English
Display Font Names in English rather than True Type or Postscript Code
Reset Palette Locations to Default
{Click} “Reset Palette Locations to Default” to restore Photoshop’s original layout
Trang 36Preferences - Saving Files
Image Previews
To save previews or thumbnails of your images select “Always Save” in the Image Previews drop-down menu You will see these thumbnails when you open
and {Single-Click} images stored in a directory using Photoshop’s Open
command To save disk space select “Never Save.” Select “Ask When Saving”
if you want Photoshop to ask if you desire a thumbnail or not whenever you save
an image
File Extension
Select “Use Lower Case” to force Photoshop to save files with lower case file type extensions Lower case extensions have become the de-facto standard and are recommended Unix servers are case sensitive so a consistent character-case, upper or lower is important to maintain when using your images for the Internet
File Compatibility
Check “Include Composited Image With Layered Files” under File Compatibility
to ensure programs or applications that don’t support Photoshop’s Layers can load the image Uncheck to create a smaller file
Trang 37Preferences - Display and Cursors
recommend selecting Brush Size so you can see the area and size your brush will be covering
Other Cursors
Select Standard or Precise Standard displays an icon of the tool, such as the Eye Dropper, and Precise displays a cross hair For increased accuracy in editing, we recommend selecting Precise
Trang 38Preferences - Transparency & Gamut
Leave the transparency and Gamut settings at default These features are
covered in depth in later chapters
Trang 39Preferences - Guides and Grid
Guides
Select “Color” and “Style” to designate how your guides appear in Photoshop Guides are straight lines, either horizontal or vertical, that you use as points of reference when editing your images
Grid
Select “Color,” “Style,” “Gridline every,” and “Subdivisions” to customize Grid settings Similar to Guides, the Grid is used as a point of reference when editing images Both Guides and Grid are covered in later chapters
Trang 40Preferences - Plug-Ins & Scratch Disks
Plug-Ins are extra features that extend Photoshop’s capabilities Filters, for
instance are actually Plug-Ins that can be added and removed
Plug-Ins Folder
By default, Plug-Ins are stored under the Photoshop\Plug-Ins directory To
change the path select “Choose” and enter the new path However, we
recommend you keep the path at default
Scratch Disks
Scratch Disks are areas of your hard drive Photoshop uses for memory when physical memory (your RAM) is full An image in Photoshop takes approximately 3-5 times its file size For instance, if your file takes up 10 Megabytes on your hard drive, Photoshop requires approximately 40 Megabytes of RAM when
working with it As you work on multiple images RAM requirements increase and Photoshop will begin to use your hard drive for virtual (rather than physical) RAM
It is recommended that free space on your hard drive for the Scratch Disk equals
at least the amount of physical RAM in your system If you have 128 Megabytes
of RAM for instance, you should have at least 128 Megabytes of storage space
on your hard drive for the Scratch Disk The greater the RAM and free space the better Photoshop performs If you have more than one hard drive, we
recommend installing Photoshop on one and designating your Scratch Disk
space on another Photoshop can have up to four Scratch Disks To designate what hard drive will act as your Scratch Disk select the drive letter or volume from the drop down list By default, Photoshop uses your Startup hard drive