Greg Coats <gregcoats <at> mac.com> writes: > > I would prefer to obtain in one step the absolute value of the difference between two pixels, in part because > I do not see the meaning of a negative pixel value. In my example, I do not see meaning to a signed byte value > for a pixel channel being red=-51. Greg
Hi, If somebody is doing for example change detection by comparing satellite images from different dates, it is not at all the same if the result is 99-150=-51 or 150-99=51. -Jukka Rahkonen- _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
