Canon MG5500 series Online Manual page 119

Adjust the Blue channel.
Note
Only Grayscale will be displayed in Channel when Color Mode is Grayscale.
Brightness
Adjust the image brightness. Move
right to brighten the image. You can also enter a value (-127 to 127).
Darkened
Note
Highlights may be lost if you brighten the image too much, and shadows may be lost if
you darken the image too much.
Contrast
"Contrast" is the degree of difference between the brighter and darker parts of an image.
Increasing contrast will increase the difference, thus sharpening the image. Decreasing
contrast will decrease the difference, thus softening the image.
Move (Slider) under Contrast to the left to decrease and right to increase the contrast of
the image. You can also enter a value (-127 to 127).
Decreased contrast
(Slider) under Brightness to the left to darken and
Original image
Original image
119
Brightened
Increased contrast