[mapserver-users] AGG - FORMATOPTION PALETTE

[thomas bonfort]

hi,
you can send me your rgb.png, I'll have a look, but gdal does "seem"
to find  an rgba file, as shown by the quadruples printed out ( eg:
17,12,12,255)

cheers
--
Thomas Bonfort
Camptocamp France SAS
http://www.camptocamp.com

On Thu, Apr 24, 2008 at 3:29 PM, Léveillé, James
<James.Leveille at mtq.gouv.qc.ca> wrote:
>
>
>
> Hi,
>
> I'm trying to use my own palette for AGG as described here by Thomas :
> http://www.nabble.com/forced-palette-and-quantization-for-RGBA-images-td14645869.html
>
> As explained in the article, I'm using a typical PNG 24 bits image (produced
> in RGBA mode - 4 bands).
> But from this image, I'm not able to produce a 8 bits PNG image with the
> ALPHA, only in RGB with 3 channels - see the GDALINFO below.
> I need this 8 bits image to generate my palette.
>
> gdalinfo rgb.png
> Driver: PNG/Portable Network Graphics
> Size is 1203, 813
> Coordinate System is `'
> Corner Coordinates:
> Upper Left  (    0.0,    0.0)
> Lower Left  (    0.0,  813.0)
> Upper Right ( 1203.0,    0.0)
> Lower Right ( 1203.0,  813.0)
> Center      (  601.5,  406.5)
> Band 1 Block=1203x1 Type=Byte, ColorInterp=Palette
>   Color Table (RGB with 256 entries)
>     0: 17,12,12,255
>     1: 27,101,44,255
>     2: 0,132,0,255
>     3: 19,130,16,255
> ...
>
> How can I generate a 8 bits RGBA image from the original 24 bits image ?
>
> Regards.
>
>
>
> JAMES
>
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