Canon PIXMA MG4200 Series On-Screen Manual page 634

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Adjust the Blue channel.

Only Grayscale will be displayed in Channel when Color Mode is Grayscale.

Adjust the image brightness. Move

the image. You can also enter a value (-127 to 127).

Highlights may be lost if you brighten the image too much, and shadows may be lost if you darken the

image too much.

"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.

(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

Increasing the contrast is effective in adding a three-dimensional feel to soft images. However,

shadows and highlights may be lost if you increase the contrast too much.

(Slider) under Brightness to the left to darken and right to brighten

Original image

Increased contrast

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Pixma mg4250