Map GPS Coordinates - GPS Map Coordinates ... - Global Mapper

The Color Balance sliders allow you modify the relative amounts of red, green, and blue in the image, thus
allowing precise control over the color balance in the image.
The Contrast Adjustment options are used to adjust the contrast of imagery. The Linear (Percentage Stretch)
contrast adjustment method applies a standard deviation contrast adjust to each color channel in the image.
You can specify how many standard deviations from the mean that the range is stretch to for rendering,
although you'll generally want to stick with the default of 2. This is particularly useful for improving the
display of dark or satellite imagery, such as IKONOS images, and is required for the display of imagery with
more than 8 bits per color channe. The Linear (Min/Max Stretch) method finds the minimum and maximum
values in each color channel and stretches that range to a range of 0 to 255. For most imagery with 8 bits or
less per color channel this will have no effect, but can produce a good result for high-color imagery.
The Share Contrast Adjustment with Other Layers checkbox allows you to specify that the calculated contrast
adjustment used should be based on all loaded raster layers that have contrast adjustment enabled rather than
just the color histogram for this single layer. This is enabled by default and provides consistent results when
adjusting the contrast for multiple mosaiced images.
Cropping Tab
Global Mapper User's Manual
The Cropping tab (pictured below) allows you to crop the selected overlay(s) to a particular boundary,
including support for automatically removing the collars from USGS DRG topographic maps.
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