Create a gradient that goes from pure black to pure white to represent your bump map.
Your gradient is an example of a bump map that is difficult to adjust within the needed range.
This is your 50 percent gray marker. This is the point that is flat, neither going up nor down.
Don’t worry if your marker doesn’t hit the spot when you first lay it down. If you place the mouse pointer over the marker and it changes to a triangle, you can drag it to a better spot.
Your markers don’t have to be in the same place as mine, but your values should read the same.
Say that your bump map is perfect, except that you can’t have the values go within the 10 percent range of either end of the grayscale. In other words, your bump map has to be within 10 percent and 90 percent gray. The general relation to itself is perfect as is. If you tried to paint out just the nine percent gray and below, for example, the overall bump map values would not have the same relationship, resulting in a flattening out at either end, The lower figure is the result of adjusting the bump to keep the relative relationship of the values.
How you adjust your bump map affects how it is rendered.
What you really want is to squish the values that you have right now within 10 percent and 90 percent gray. Luckily, the solution is easy.
Bringing in the output range to be within the 10 percent and 90 percent range.
As you can see, your midgray(50 percent flat mark) is unaffected, but your extreme ends have been brought in between 10 percent and 90 percent. This simple method works as long as you bring in the range evenly on both sides.
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Adobe Photoshop Tutorial
Preferences And Settings
Customizing Your Workspace
Starting With Color Maps
Tiling And Transformations
Matte Paintings From Pictures
Quick Fixes For Common Problems
Masks And Mattes
Noise And Grain
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