Acer Film Scanner User Manual page 44

Brighter images
brighter pixels, therefore the
bars in the right are higher than
that in the left.
In addition, if we take a look at the two images below:
Image 1
We notice that in Image 1, there is higher contrast between the
brighter and darker part of the image; that is, bright and dark pixels
occupy a larger portion of the total image pixels. Therefore, in the
histogram, there are higher bars in the left (darker side) and right
(brighter side), while the bars are much lower relatively in the center.
This implies that there are only a few midtone pixels in the image.
In image 2, pixels in objects have more brightness and darkness
levels, and the distribution is more even than that in Image 1.
Therefore, the brighter, midtone and darker pixels share evenly the
total pixels in the image, which makes the histogram for Image 2 look
smoother.
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Darker images have
darker pixels, therefore the bars
in the left are higher than that in
the right.
Image 2
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