Microtek ScanMaker IIG User Manual page 172

The Shadows and Highlights screen (cont.)
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5 Output edit boxes show the 0-to-255 pixel range to where the Input levels are
mapped. For example, if you modified input values to 30 and 255 and then change
output values to 0 to 250, the input values of 30 to 255 will be "stretched" to fit the
output range of 0 to 250. This means you have a total of 250 shades (250-0=250).
Unless you have very specific effects in mind, it is better to leave this feature alone, so
everything is always mapped to 255 shades (255-0). You can experiment with this
feature to see what it does, however, and how it interacts with the input levels.
6 The Original / Enhanced box lets you choose which histogram to see: the original,
before the image was modified; or enhanced, after the image had been modified (with
shadows and highlights or any other tool).
7 The Channel button lets you control the Shadow and Highlight settings for a particular
color channel (red, green or blue) or for the Master channel (red, green, and blue
simultaneously).
8 The Input / Count / Percent figures provide information about the histogram. The
figures will appear only when the cursor is inside the histogram or if a triangle is being
moved.
• Input value indicates the color value of the data displayed in the histogram.
• Count value indicates the number of pixels at the Input value. If Input value is 2 and
Count value is 1300, then there are 1300 pixels in the image at the input value of 2.
• Percent value is the percentage of all pixels in the image where color value is less
than or equal to the input value. If Percent is 15% and Input value is 2, it means that
15% of all pixels in the image have a value of 2 or less.
5-64 Microtek User's Guide for Windows
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