HI Alistair, I ran into a similar problem recently which may be related - see https://github.com/MapServer/MapServer/pull/7200 This was related to bindings though, so it may not resolve it. Are you able to test your use case with this patch?
Seth -- web:https://geographika.net & https://mapserverstudio.net mastodon: @geographika@mastodon.social On Thu, Dec 19, 2024, at 3:35 PM, Alistair Everett via MapServer-users wrote: > > Hi all, > > Using the python API I'm trying to set a colorrange which includes a gradient > to alpha (so that the bottom end of the colorscale is transparent). I've seen > examples which suggest this should work from the mapfile eg. > https://github.com/MapServer/MapServer/blob/main/msautotest/gdal/heat.map. > > I'm trying to do it using the python API, I've tried setting the max and the > min like this: > > color_style.maxcolor = ms.colorObj("#00ffff00") > color_style.mincolor = ms.colorObj("#000000ff") > > but the alpha value disappears when I check the color style, and also > defining manually like `COLORRANGE "#00ffff00" "#000000ff"` and then using > updateFromString(). > > When I check the string everything looks correct: > > STYLE > COLORRANGE "#00ffff00" "#000000ff" > DATARANGE 0.100000 1.000000 > END # STYLE > but after I've run update from string, it seems to reinterpret as RGB without > the alpha value: > > CLASS > NAME "Yellow-brown shade gradient" > GROUP "Yellow-brown_shade_gradient" > STYLE > COLORRANGE 0 255 255 0 0 0 > DATARANGE 0.100000 1.000000 > END # STYLE > END # CLASS > > And then I don't get any transparency in the resulting layer. Am I doing > something wrong, or is there any way around this using the API? > > Thanks, > Alistair > > _______________________________________________ > MapServer-users mailing list > MapServer-users@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/mapserver-users >
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