Canon MF419x User Manual page 332

(Histogram)
A histogram is a graph that shows the distribution of brightness in an image. You can
adjust the image while checking the preview image and histogram. Specify the part of
the image you want to make brightest (or darkest) in the preview image, so that the
brightness balance of the original image is automatically adjusted with the specified
part being the average. Likewise, you can also adjust the balance with the brightness
of the medium tone being the average.
[Channel]
● If you select [Color] for [Color Mode], you can adjust the [Red], [Green] and [Blue] color channels
separately. To adjust all three colors at the same time, select [Master]. You can combine the
adjustments made in [Master] and those made in the individual color channels.
● If you select [Grayscale] for [Color Mode], only [Grayscale] is displayed.
(Black-point Eyedropper) /
Click the parts on the preview image (or cropping frame) you want to specify as the darkest, the medium,
and the brightest. Slide
(Gray Balance Eyedropper Tool)
Click a part on the preview image (or cropping frame) you want to render as an achromatic color, which is
black, grey, or white, each of which does not have color depth. Color tone on the rest of the image is
adjusted with the clicked part being the average. For example, if snow on a photograph image is bluish,
click this part because you essentially want to render this part as white. When you click this part, the snow
is no longer bluish, and the entire image is adjusted so that it comes closer to natural colors. Click
different parts little by little while checking the preview image to produce the optimum color tone.
(Tone Curve Settings)
The tone curve is a curved line that indicates the brightness and contrast levels of the
image before and after adjustment. Select a registered tone curve to adjust the
brightness and contrast levels of the image.
[Channel]
● If you select [Color] for [Color Mode], you can adjust the [Red], [Green] and [Blue] color channels
separately. To adjust all three colors at the same time, select [Master]. You can combine the
adjustments made in [Master] and those made in the individual color channels.
● If you select [Grayscale] for [Color Mode], only [Grayscale] is displayed.
[Select Tone Curve]
Using the Machine as a Scanner
(Mid-point Eyedropper) /
, , or . Alternatively, you can enter a value.
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(White-point Eyedropper)