Sử dụng photoshop cs5 part 38 pot

Shadows/Highlights preserves more pixels in each tonal range than Levels and Curves, which can be confirmed by studying the Histogram panel before and after applying the command to an im

Applying the Shadows/Highlights

command

Shadows/Highlights Ais one of our favorite tonal

adjustment commands because it provides very

tar-geted controls It adjusts the luminance of each

indi-vidual pixel depending on the darkness or lightness

of neighboring pixels, and lets you apply corrections

to a specific tonal range without overadjusting other

areas of the image The command does a good job

of recovering details in the shadows and highlights,

making it invaluable for correcting overexposed and

underexposed areas, such as subjects that are in

shadow due to strong side or back lighting

Shadows/Highlights preserves more pixels in each

tonal range than Levels and Curves, which can be

confirmed by studying the Histogram panel before

and after applying the command to an image.BAnd

because Shadows/Highlights lets you pinpoint the

tonal ranges to be corrected, you won’t have to use

multiple adjustment layers and layer masks to limit

the area of adjustment, as you do when using Levels

and Curves

B No gaps or spikes appear on the Histogram panel when you apply Shadows/Highlights because the command pre-serves an adequate number of pixels in each tonal range.

Continued on the following page

A We checked Show More Options at the bottom of the Shadows/Highlights dialog to display the Shadows, Highlights, and Adjustments sliders The sliders will give us extra control over which image areas are affected by the adjustment.

2 Choose Image > Adjustments > Shadows/

Highlights The Shadows/Highlights dialog

opens and the image is adjusted automatically

using preliminary settings Check Show More

Options to display all the available options

3 For the Shadows:

Adjust the Amount value BTo lighten the

shadows in order to recover details in those

areas, start with the default Amount of 35%

If your photo needs a stronger correction,

increase this value to 70%

Change the Tonal Width value to control the

range of midtones that are included in the

too much, as allowing too many pixels to be compared could diminish the contrast and coun-teract the desired adjustment

Note: After adjusting the Tonal Width or Radius value, you may need to readjust the Amount value

4 For the Highlights:

Adjust the Amount value Increase this value to

darken and recover details in the highlight areas

By lowering the brightness of the highlights, you are allowing the midtones to stand out more

A The shadow areas in this original image lack detail B In the Shadows/Highlights dialog, our Shadows setting

of Amount 57 successfully lightened the shadows but also lightened too many of the midtones.

Instructions continue on page 230

A We reduced the Shadows: Tonal Width value to limit the

adjustment to just the lower midtones and shadows, and with

that new tonal restriction in place, increased the Shadows:

Amount value (slightly) to further lighten the shadows.

B Our choice of increased Shadows: Amount and reduced Shadows: Tonal Width values (shown at left) successfully restored details to the shadows and midtones.

Continued on the following page

Use the Midtone Contrast slider to increase or

decrease the contrast in the midtones

8 Optional: To save your Shadows/Highlights

set-tings as a preset for use with other images, click

Save, enter a descriptive name (keep the shh

extension), choose a location for the preset file,

then click Save again To load a saved settings

preset in the dialog, click Load

9. Click OK

➤ To restore the default settings to the dialog,

hold down Alt/ Option and click Reset (Cancel

becomes Reset)

B This is the original photo, for comparison with the final

corrected image at right.

C Using the Shadows/Highlights controls, we lightened the shadows and midtones in this photo and improved the over-all balance between the midtones, shadows, and highlights.

A Next, we increased the Highlights: Amount value to subdue the sky This had the unintended result of making the lower part of the sky too dark To lighten just the upper midtones, we increased the Radius value (instead of chang-ing the Highlights: Tonal Width value).

Applying a tint via a Solid Color fill

layer

If you apply a color to a layer (or to a selection on a

layer) via a Solid Color fill layer, you will be able to

edit or remove it at any time This is a simple but

effective way to correct a color cast or apply a color

tint — typically, to a selected area of an image

To apply a tint via a Solid Color fill layer:

1 Optional: To restrict the tint to part of an image,

create a selection.A

2 From the New Fill/Adjustment Layer menu

on the Layers panel, choose Solid Color

3. In the Color Picker dialog,choose a color for the

tint.B Don’t sweat over this; you can change the

color later if you wish Click OK

4 The fill layer is fully opaque Lower the layer

opac-ity to make it semitransparent and/or change its

blending mode (press Shift- + or Shift- –) to make

it interact differently with underlying layers.C

➤ To change the tint for a color fill layer,

double-click the adjustment layer thumbnail; this

reopens the Color Picker

➤ You can limit the effect of a Solid Color, Gradient,

or Pattern fill layer by clicking the layer mask

thumbnail, then applying black strokes to areas

in the document (This couldn’t be done for

the Color Overlay, Gradient Overlay, or Pattern

Overlay layer effect.) Note: Keep the Use Default

Mask on Fill Layers option checked in the Panel

Options dialog, which opens from the Layers

panel menu, to ensure that all new fill layers that

you create will automatically have a mask

A The sky in this image looks washed out To select that area before applying a tint, we chose the Quick Selection tool, then dragged across the sky Next, we clicked the sky area below each arm, then Alt/Option dragged to deselect any selected areas of snow

C The blue tint that we applied via a Solid Color fill layer enlivened the sky In addition, we chose Vivid Light as the blending mode for the adjustment layer to restore some definition to the clouds.

B In the Color Picker, the color we chose has values of

H: 230, S: 35, and B: 41.

a specific area of the image, create a selection

3 Click an image layer or the Background, Athen

on the Adjustments panel, click the Levels

button The Levels controls display

4 To reduce contrast in the image, move the

Output Levels shadows (black) slider to the

right.B

5 To lighten the midtone values in the image,

move the Input Levels midtones (gray) slider to

the left.C

6 Optional: Hold down the View Previous State

button to view the original state of the image

temporarily, then release A The original document contains an editable type

layer above an image layer

C With the image screened back, now the type is more eye-catching and easier to read.

B We used these settings for a Levels

adjust-ment layer to lighten the image.