[gdal-dev] Issue with writen colortables

[Osahon Oduware]

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On Mar 26, 2020 20:59, "Joaquim Manuel Freire Luís" <jluis at ualg.pt> wrote:

> Attached are two tinny indexed images created with GMT but via GDAL.
>
> The .tif file looks right but if look at the .png (it needs lots of zoom)
> we can see that the top left pixel is missing. That happens, I think,
> because the transparency column has a first value of 0 whilst all the
> others are 1’s. I checked this both with GDAL and Matlab.
>
>
>
> The code that writes it is
>
> https://github.com/GenericMappingTools/gmt/blob/
> master/src/gmt_gdalwrite.c#L343
>
> where .c4 is well set to 255. However when it lands on the file, the first
> was converted to 0.
>
>
>
> Again, I’m doing this the Julia bindings so have no C code to provide a
> MWE.
>
>
>
>
>
>
>
> Thanks
>
>
>
> Joaquim
>
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