Справочник Пользователя для Adobe photoshop cs2
447
ADOBE PHOTOSHOP CS2
User Guide
8
To apply the results only to opaque areas in the result layer, select Preserve Transparency.
9
If you want to apply the blending through a mask, select Mask. Then choose the image and layer containing the
mask. For Channel, you can choose any color or alpha channel to use as the mask. You can also use a mask based on
the active selection or the boundaries of the chosen layer (Transparency). Select Invert to reverse the masked and
unmasked areas of the channel.
the active selection or the boundaries of the chosen layer (Transparency). Select Invert to reverse the masked and
unmasked areas of the channel.
To use the Calculations command
The Calculations command lets you blend two individual channels from one or more source images. You can then
apply the results to a new image or to a new channel or selection in the active image. You cannot apply the Calcula
tions command to composite channels.
apply the results to a new image or to a new channel or selection in the active image. You cannot apply the Calcula
tions command to composite channels.
1
Open the source image or images.
Note: If you are using more than one source image, the images must have the same pixel dimensions.
2
Choose Image > Calculations.
3
To preview the results in the image window, select Preview.
4
Choose the first source image, layer, and channel. To use all the layers in the source image, choose Merged for
Layer.
5
To use the negative of the channel contents in the calculation, select Invert. For Channel, choose Gray if you want
to duplicate the effect of converting the image to grayscale.
6
Choose the second source image, layer, and channel, and specify options.
7
For Blending, choose a blending mode.
For information on the Add and Subtract options, see “About the Add and Subtract blending modes” on page 447.
For information on other blending options, see “List of blending modes” on page 487.
For information on other blending options, see “List of blending modes” on page 487.
8
Enter an Opacity value to specify the effect’s strength.
9
If you want to apply the blending through a mask, select Mask. Then choose the image and layer containing the
mask. For Channel, you can choose any color or alpha channel to use as the mask. You can also use a mask based on
the active selection or the boundaries of the chosen layer (Transparency). Select Invert to reverse the masked and
unmasked areas of the channel.
the active selection or the boundaries of the chosen layer (Transparency). Select Invert to reverse the masked and
unmasked areas of the channel.
10
For Result, specify whether to place the blending results in a new document or in a new channel or selection in
the active image.
About the Add and Subtract blending modes
The Add and Subtract blending modes are available only for the Apply Image and Calculations commands.
Add
Adds the pixel values in two channels. This is a good way to combine nonoverlapping images in two channels.
Because higher pixel values represent lighter colors, adding channels with overlapping pixels lightens the image.
Black areas in both channels remain black (0 + 0 = 0). White in either channel results in white (255 + any value = 255
or greater).
Black areas in both channels remain black (0 + 0 = 0). White in either channel results in white (255 + any value = 255
or greater).
Add mode divides the sum of the pixel values by the Scale amount and then adds the Offset value to the sum. For
example, to find the average of the pixels in two channels, add them, divide by 2, and enter no Offset value.
example, to find the average of the pixels in two channels, add them, divide by 2, and enter no Offset value.
The Scale factor may be any number between 1.000 and 2.000. Entering a higher Scale value darkens the image.