Graphics Programs Reference
In-Depth Information
You also have the ability to grab a point in the image itself and change it by moving your
cursor up and down (I have added a Yellow background to the Icon that you have to click
to activate this feature). The diagonal line in the panel will change at the same time as the
image.
Every pixel in the image will correspond to a tone on the histogram. When you click on a
point in the image, you are also clicking on a point along the diagonal line. This point on
the line, will determine how the curve changes as you drag your cursor up or down in the
image.
If you click on the pencil icon along the left side of the panel, you can draw in your own
curve. I added a red backdrop for this icon.
Most images will look their best with an S-Shaped curve, but the curves can get quite elab-
orate.
In general, moving a point upward will brighten part of the image and moving it down
will darken part of the image. The range of tonal values that are affected depends on how
well the change blends with adjoining points. The Curves Adjustment wants to maintain a
smooth curve and will change as much of the image as necessary to achieve that balance.
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