Hello List:
I have imported into ERMapper a USGS DRG (Digital Rater Graphic). These
files are 8-bit index colored files. Each indexed color value is comprised
of a R, G, and B value. When I show a cell value in the .ERS for the green
pixels for instance I see displayed the value for each of the R,G and B
components. Ultimately my goal is to turn all pixels that are not green to
null and leave just those that are green. I am very familiar with writing
formulas when the pixel has only one value such as a height, but not sure
what to do when a pixel has a value for R,G and B. I do not really care
what the exact new value would be just so I could differentiate from other
pixels that are blue or red, etc.
Any help would be appreciated.
Greg
-----------------------------------------------------------
To make changes to your subscription, please visit our website,
http://www.ermapper.com/technicl/ermapperl/index.htm
