Hi Steve, I am trying to achieve the transparency effect as described in the documentation: "IMAGECOLOR [r] [g] [b]Color to initialize the map with (i.e. background color). When transparency is enabled (TRANSPARENT ON) for the typical case of 8-bit pseudocolored map generation, this color will be marked as transparent in the output file palette. Any other map components drawn in this color will also be transparent, so for map generation with transparency it is best to use an otherwise unused color as the background color."Perhaps I'm not clear on what constitutes "8-bit pseudocolored map generation". I am using the AGG/PNG driver with TRANSPARENT ON.
Glenn Waldron : Pelican Mapping : http://pelicanmapping.com : +1.703.652.4791 On Thu, Feb 5, 2009 at 2:04 PM, Steve Lime <steve.l...@dnr.state.mn.us>wrote: > IMAGECOLOR just sets the background color for an image. > > Steve > > >>> On 2/5/2009 at 1:02 PM, in message > <70fbea790902051102p52a8067ar643666f056264...@mail.gmail.com>, Glenn > Waldron > <gwald...@gmail.com> wrote: > > Hi Thomas, > > > > In that case maybe I am misunderstanding the purpose of IMAGECOLOR. What > is > > it supposed to do, if not make all pixels of the specified color > > transparent? > > > > > > Glenn Waldron : Pelican Mapping : http://pelicanmapping.com : > > +1.703.652.4791 > > > > > > On Thu, Feb 5, 2009 at 1:24 PM, thomas bonfort > > <thomas.bonf...@gmail.com>wrote: > > > >> On Thu, Feb 5, 2009 at 14:43, Glenn Waldron <gwald...@gmail.com> wrote: > >> > Stephen, > >> > > >> > However, I am trying to > >> > get the pixels in the final composited image to be completely > >> transparent. > >> > > >> > >> There's no way you can set pixels to become transparent once the image > >> is saved with the AGG outputformat. > >> > >> regards, > >> thomas > >> > >
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