No, you didn't misunderstand, that's what I was looking for (duh)... However, I get really inconsistent behavior using that method. Partially because upon closer inspection my RGB has more than 6 colors (anti-aliasing). Still large blocks of pixels don't match when using an expression like ([red] = 255 AND [green] = 0 AND [blue] = 0) even though they should, based on inspection with a tool like Photoshop. I figured out a workaround.
On Thu, Sep 16, 2021 at 12:26 PM Daniel Morissette <dmorisse...@mapgears.com> wrote: > Maybe I misunderstood the question, is it not what raster class > expressions are for? > > https://mapserver.org/input/raster.html#classifying-rasters > > CLASS > NAME "red -> blue" > EXPRESSION ([red] = 255 AND [green] = 0 AND [blue] = 0) > STYLE > COLOR 0 0 255 > END > END > > > On 2021-09-16 12:46, Steve Lime wrote: > > Hi all: I think this is possible. What's the easiest/best way to recolor > > a raster image, so for example, turning all pixels of 255 0 0 to 0 0 > > 255? There are only 6 colors in the input image I need to deal with. > > > > --Steve > > > > _______________________________________________ > > MapServer-users mailing list > > MapServer-users@lists.osgeo.org > > https://lists.osgeo.org/mailman/listinfo/mapserver-users > > > > > -- > Daniel Morissette > Mapgears Inc > T: +1 418-696-5056 #201 > _______________________________________________ > MapServer-users mailing list > MapServer-users@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/mapserver-users >
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