Canon PIXMA MX392 Online Manual page 103

Images with more data distributed to the shadow side
Move the Mid-point Slider toward the shadow side.
Adjusting Histograms (Using the Droppers)
When you select a Channel and click the Black-point, Mid-point, or White-point Dropper, the mouse pointer
on the preview image changes to a dropper. Click a Dropper displayed below the histogram to change the
setting.
- The point clicked with
to 245).
- The point clicked with
value (5 to 250).
- The point clicked with
(10 to 255).
- Click (Dropper) for Gray Balance and click the area you want to adjust the color in the preview
image.
The clicked point will be set as the achromatic color reference, and the rest of the image is adjusted
accordingly. For instance, if snow in a photo appears bluish, click the bluish part to adjust the whole image
and reproduce natural colors.
(Black-point Dropper) will be the darkest point. You can also enter a value (0
(Mid-point Dropper) will be the middle of the tonal range. You can also enter a
(White-point Dropper) will be the brightest point. You can also enter a value