[gdal-dev] Issue with writen colortables

[Joaquim Manuel Freire Luís]

Ah, thanks. So the solution is to not call GDALSetRasterNoDataValue() unless we really want to set one color as transparent.

From: Even Rouault <even.rouault at spatialys.com>
Sent: Thursday, March 26, 2020 11:24 PM
To: Joaquim Manuel Freire Luís <jluis at ualg.pt>
Cc: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] Issue with writen colortables


On jeudi 26 mars 2020 23:19:47 CET Joaquim Manuel Freire Luís wrote:

> Funny, I made it nodata = 1 and the zero moved to second place.



Fully determinstic behaviour: GDAL sets the alpha component of the entry in

the color table whose value is nodata to 0:



https://github.com/OSGeo/gdal/blob/master/gdal/frmts/png/pngdataset.cpp#L1820



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