Applying Special Color Effects To Images; To Desaturate Colors; To Invert Colors - Adobe PHOTOSHOP CS2 User Manual

You can use the Equalize command when a scanned image appears darker than the original and you want to balance
the values to produce a lighter image. Using Equalize together with the Histogram palette lets you see before-and-
after brightness comparisons.
(Optional) Select an area of the image to equalize.
1
2 Choose Image > Adjustments > Equalize.
If you selected an area of the image, select what to equalize in the dialog box, and click OK:
3
Equalize Selected Area Only
Equalize Entire Image Based On Selected Area

Applying special color effects to images

To desaturate colors

The Desaturate command converts a color image to grayscale values, but leaves the image in the same color mode.
For example, it assigns equal red, green, and blue values to each pixel in an RGB image. The lightness value of each
pixel does not change.
This command has the same effect as setting Saturation to -100 in the Hue/Saturation dialog box.
Note: If you are working with a multilayer image, Desaturate converts the selected layer only.
Choose Image > Adjustments > Desaturate.

To invert colors

The Invert command inverts the colors in an image. You can use this command as part of the process of making an
edge mask to apply sharpening and other adjustments to selected areas of an image.
Note: Because color print film contains an orange mask in its base, the Invert command cannot make accurate positive
images from scanned color negatives. Be sure to use the proper settings for color negatives when scanning film.
When you invert an image, the brightness value of each pixel in the channels is converted to the inverse value on the
256-step color-values scale. For example, a pixel in a positive image with a value of 255 is changed to 0, and a pixel
with a value of 5 is changed to 250.
Do one of the following:
Choose Image > Adjustments > Invert.
•
• (Photoshop) Choose Layer > New Adjustment Layer > Invert. Click OK in the New Layer dialog box.
Evenly distributes only the selection's pixels.
Evenly distributes all image pixels based on those in the selection.
ADOBE PHOTOSHOP CS2 312
User Guide