User's Manual

15
ADOBE PHOTOSHOP CS2
User Guide
5. Adjust the midtones.
The middle input slider (the gray triangle below the histogram) adjusts the gamma, or contrast, of the midtone
values. It moves the midtone (level 128) and changes the intensity values of the middle range of gray tones without
significantly altering the highlights and shadows.
Move the middle input slider to the left to lighten the image or to the right to darken the image.
6. Remove the color cast.
Select the Set Gray Point Eyedropper tool in the Levels dialog box (the middle eyedropper). Click an area in the
image that should be gray. That area becomes neutral gray, and the color cast is removed.
The Set Gray Point Eyedropper tool works best on images with easily identified neutral tones. Advanced users often
us
e the Levels command to adjust individual channels and remove a color cast.