Canon PRO-10 Series Manual page 212

Setting "Brightness" and "Adjust levels"
You can set "Brightness," "Adjust levels" and "Red-eye corr. (Red-eye correction)" for printing.
Brightness Correction
You can adjust the overall image brightness by increasing or reducing the midtone brightness, without
changing the colors of the darkest (blackest) and brightest (whitest) areas.
Even for a photo of "blue sky and shadows," you can make the shadowy areas clearer by "brightening"
the photo.
Brighten
Darkest (blackest) area
Level Adjustment
By detecting the darkest (blackest) and brightest (whitest) areas automatically or by specifying them,
you can print images suitable for the midtone brightness.
Exposure can be corrected even if set incorrectly when shooting an image.
Auto
Detects the darkest (blackest) and brightest (whitest) areas of an image by analyzing it, then adjusts to
the appropriate level.
Manual
Specify the darkest (blackest) and brightest (whitest) areas and adjust to the desired level.
Red-eye Correction
Corrects red eyes caused by a camera flash.
Setting "Contrast," "Saturation," "Color tone" and "Color balance"
You can set "Contrast," "Saturation," "Color tone" and "Color balance" in Detail set. in Natural M.
Contrast Adjustment
You can adjust the overall image sharpness by increasing or reducing the contrast of the midtone
brightness, without changing the colors of the darkest (blackest) and brightest (whitest) areas.
You can improve images lacking sharpness by "emphasizing" the contrast to turn them into sharp
images.
Brightest (whitest) area
Standard
Brightest (whitest) area
Darken