Click the Optimized File Format list arrow, and then click PNG-24.. Click Save to save the current image using the Save Optimized As dialog box... Click the Optimized File Format list
Trang 1The PNG-24 file format is used primarily for images that contain lots of colors with soft transitional edges, such as photographs, and was designed as an alternative to the JPEG file format The PNG-24 format generates an image with millions of colors, and still manages to reduce the size of a file While similar to the JPEG file format, the PNG-24 uses lossless compression, and does not compress files as small as the JPEG format So for the time being, most designers are still using the JPEG format for creating faster-loading web graphics
Optimizing a PNG-24
Document
Optimize a PNG-24 Document
Open a document
Click the File menu, and then click
Save For Web & Devices.
Click the Original, Optimized, 2-Up,
or 4-Up tabs to view the document
using different layouts
Click one of the sample images to
change its default format
Click the Optimized File Format list
arrow, and then click PNG-24.
Select from the following options:
Transparency Options:
◆ Transparency Check to keep
the transparent areas of a
PNG-24 image transparent
◆ Matte Click to fill the
trans-parent areas of a PNG-24
image
Other Options:
◆ Interlaced Check to have the
PNG-24 image load in three
scans
Click Save to save the current
image using the Save Optimized
As dialog box
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Trang 2The WBMP file format is used for images that are displayed on small hand-held devices such as PDAs and cell phones The WBMP format generates an image with only 2 pixel colors (black and white), which significantly reduces the file size of the image The WBMP for-mat is new to the world of wireless devices, and while it creates small images, using only black and white pixels results in very low-quality images
Optimizing a WBMP
Document
Optimize a WBMP Document
Open a document
Click the File menu, and then click
Save For Web & Devices.
Click the Original, Optimized, 2-Up,
or 4-Up tabs to view the document
using different layouts
Click one of the sample images to
change its default format
Click the Optimized File Format list
arrow, and then click WBMP.
Select from the following options:
◆ Method Click the list arrow,
and then select from the
available dithering schemes
(None, Diffusion, Pattern, or
Noise) Dithering is how the
WBMP format mixes the
available colors in the image
◆ Amount Enter or select a value
from 0% to 100% to instruct the
WBMP compression utility how
many of the image’s colors
should be dithered
Click Save to save the current
image using the Save Optimized
As dialog box
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Trang 3An animation is a sequence of images, or frames, that vary slightly to
create the illusion of movement over time One of the most Internet-compatible animation formats is the animated GIF The original designa-tion, GIF89a, gives you an idea of how long this format has been around The GIF file format (Graphics Interchange Format) is used pri-marily for clip art, text, and line art, or for images that contain areas of solid color Once the image is created, you can open and use it in any application that supports the GIF file format
Creating an Animated
GIF
Create an Animated GIF from
Scratch
Open Photoshop
Click the File menu, and then click
New.
Enter a name in the Name box
Click the Preset list arrow, and
then select from the available
presets, or enter in a customized
Width, Height, and Resolution
Click the Color Mode list arrow,
and then select a color mode for
the image
Click the Bit Size list arrow, and
then choose a bit depth for the
image (8 bit recommended)
Click the Background Contents list
arrow, and then click White,
Background Color, or Transparent
(animated GIF files look best using
transparency)
Click OK.
Create the first image for the
animated GIF
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9 First image Copied layers for the animation
Trang 4Press Ctrl+J (Win) or A+J (Mac)
to create a copy of your first
animation in a separate layer
Modify the second image
(animations are essentially the
same image, modified slightly
between each animation frame or,
in this case each layer)
Repeat steps 10 and 11 until you
have enough layers for the
animation
Click the Window menu, and then
click Animation.
Click the Animation Options button
on the Animation panel, and then
click Make Frames From Layers.
Click the Play button to view your
animation in the document
window
Click the File button, and then
click Save For Web & Devices.
Fine-tune the image using the
available options
Click Save to save the current
image using the Save Optimized
As dialog box
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See Also
See Chapter 9, “Using the Paint, Shape
Drawing, and Eraser Tools,” on page
215 for more information on using the
various drawing tools
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Trang 5After you create an animation using the Animation panel, you can use controls at the bottom of the panel to work with the animation You can use controls to select frames, play back the animation, and specify how many times you want to play it back If you need to quickly copy or remove frames, you can use the Duplicate Selected Frames or Delete Selected Frames buttons Animation is all about creating motion, which can be time intensive to do on a frame-by-frame basis In Photoshop, it's not necessary to create every frame You can use the Tweens Animation Frames button to help you create frames between one frame
and another Tweening allows you to quickly animate objects The
ani-mation appears by default in the Frames view; however, you can also
display it in Timeline view (Extended) In Timeline view, you can see
how each layer within the animation plays In this view, you can also
use Onion Skin mode, which allows you to view multiple frames
simul-taneously
Working with
Animation
Work with an Animation
Open a document with an
animation
Click the Window menu, and then
click Animation.
Select any of the following options
to play and select frames in the
animation:
◆ First Frame Selects the first
frame
◆ Previous Frame Selects the
previous frame
◆ Play Plays the animation.
◆ Next Frame Selects the next
frame
Click the Loop Count list arrow,
and then select the option you
want
◆ Once/3 Times Plays the
animation one time or three
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Timeline view
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Trang 6Select any of the following options
to work with frames:
◆ Tween Frames Creates motion
tween between frames
◆ Duplicate Frames Duplicates
the selected frames
◆ Delete Frames Deletes the
selected frames
To switch to Timeline view
(Extended), click the Convert to
Timeline Animation button.
◆ This is a toggle button that
switches back and forth
between Timeline and Frames
animation view
Select any of the following options
to play and select frames in the
animation:
◆ Zoom In and Zoom Out
Changes the Timeline view to
see more or less of the
animation window
◆ Onion Skinning Displays
multiple frames simultaneously
To display other commands and
options, click the Animation
Options button.
To switch to Frames view, click the
Convert to Frame Animation
button
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Options menu for Frames view
Options menu for Timeline view
Onion skinning