[gdal-dev] how to create an image with a colortable?

[Samantha Goodchild-Brown]

After using gdal info to confirm my input image is a greyscale, using 
the FAQRaster intructions I used gdal_translate to create a VRT.
I then opened it in crimson editor to edit the colorinterp and add in 
the colortable. I used

<ColorInterp>Palette</ColorInterp>
<ColorTable>
        <11 c1="181" c2="69"  c3="15"/>
        <12 c1="224"  c2="86"  c3="20"/>
        <13 c1="229"  c2="130"  c3="21"/>


AHA, I see my first error. I forgot to add the '/' to close the 
paragraph. I am VERY RUSTY at this.

Gdal was complaining about not being able to close the file and refering 
me to </VRTRasterBand> and
</VRTDataset> which confused me greatly as I didn't touch it at all.

Now it runs, but fails because it tells me my datatype is not compatiable.
This is a different issue I will take up separately as I expect has 
nothing to do with GDAL.

Many thanks. Will keep at it.


On 2012/09/26 11:54, Chaitanya kumar CH wrote:
> Sam,
>
> What did you do? What errors did you get?
>
> On Wed, Sep 26, 2012 at 12:23 PM, Samantha Goodchild-Brown 
> <samanthag at geograph.co.za <mailto:samanthag at geograph.co.za>> wrote:
>
>     I need to change a greyscale image to Palette and specify the
>     colors to use for specific values.
>
>     However I am getting very confused with all the 'comments' and
>     references and instructions
>
>     eg.
>     In "
>     http://trac.osgeo.org/gdal/wiki/FAQRaster#Howtocreateormodifyanimagecolortable"
>     it is explained how to edit a VRT to make a new tif with a color
>     palette of your choice.
>     However in later 'fishings' I saw someone mention that this
>     doesn't work and that the only way to do it is with scripting or
>     programming.
>
>     I am now also trying as it seems to be the simplest method but I
>     am also failing.
>
>     Other tickets etc that come close are in the region of 4 years old
>     etc and way over my head.
>
>     Besides the obvious (gdal error messages), can anyone tell me why
>     this is happening? what I need to tweek? if a fix is on the way?
>     is it still valid that the only workaround is with scripting?
>     Does anyone know of another open source method that doesn't
>     involve scripting?
>
>     Many thanks
>     Sam
>     _______________________________________________
>     gdal-dev mailing list
>     gdal-dev at lists.osgeo.org <mailto:gdal-dev at lists.osgeo.org>
>     http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>
>
>
> -- 
> Best regards,
> Chaitanya kumar CH.
>
> +91-9494447584
> 17.2416N 80.1426E

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