Справочник Пользователя для Adobe photoshop cs2
645
ADOBE PHOTOSHOP CS2
User Guide
To use masks to modify JPEG quality
When you use masks to optimize the range of quality in a JPEG image, white areas of the masks yield the highest
quality, and black areas of the masks yield the lowest quality. You can adjust the maximum and minimum level of
quality in the Modify Quality Setting dialog box.
quality, and black areas of the masks yield the lowest quality. You can adjust the maximum and minimum level of
quality in the Modify Quality Setting dialog box.
1
In the Optimize panel/palette, choose a JPEG setting from the Preset menu, or choose JPEG from the file format
menu.
2
Click the Mask button
to the right of the Quality text box.
3
Choose which masks to use:
All Text Layers
Uses the masks from all text layers in the image.
All Vector Shape Layers
Uses the masks from all shape layers in the image.
Channel
Specifies an alpha channel. (In ImageReady, you can choose Save Selection to create a new alpha channel
based on the current selection.)
4
To preview the results of the weighted optimization, select the Preview option.
5
Define the quality range:
•
To set the highest level of quality, drag the right (white) tab on the slider, enter a value in the Maximum text box,
or use the arrows to change the current value.
or use the arrows to change the current value.
•
To set the lowest level of quality, drag the left (black) tab on the slider, enter a value in the Minimum text box, or
use the arrows to change the current value.
use the arrows to change the current value.
6
Click OK.
To use masks to modify GIF lossiness
When you use masks to optimize the amount of lossiness (or quality reduction) in a GIF image, white areas of the
masks yield the highest quality, and black areas of the masks yield the lowest quality. You can adjust the maximum
and minimum level of quality reduction in the Modify Lossiness Setting dialog box.
masks yield the highest quality, and black areas of the masks yield the lowest quality. You can adjust the maximum
and minimum level of quality reduction in the Modify Lossiness Setting dialog box.
1
In the Optimize panel/palette, choose a GIF setting from the Preset menu, or choose GIF from the file format
menu.
2
Click the Mask button
to the right of the Lossy text box.
3
Choose which masks to use:
All Text Layers
Uses the masks from all text layers in the image.
All Vector Shape Layers
Uses the masks from all shape layers in the image.
Channel
Specifies an alpha channel. (In ImageReady, you can choose Save Selection to create a new alpha channel
based on the current selection.)
4
To preview the results of the weighted optimization, select the Preview option.
5
Define the quality range:
•
To set the highest level of quality, drag the left (white) tab on the slider, enter a value in the Minimum text box, or
use the arrows to change the current value.
use the arrows to change the current value.
•
To set the lowest level of quality, drag the right (black) tab on the slider, enter a value in the Maximum text box, or
use the arrows to change the current value.
use the arrows to change the current value.