[gdal-dev] vrt removes transparent pixels?
wendell at enflight.com
Tue Apr 6 16:49:21 EDT 2010
On Wed, Apr 07, 2010 at 01:59:35AM +0530, Chaitanya kumar CH wrote:
> Can you provide the exact commands you used?
gdal_translate -of VRT centgrtlakes_radaronly.gif foo.vrt
cp centgrtlakes_radaronly.gif test.gif
gdal_translate foo.vrt test.gif
gimp centgrtlakes_radaronly.gif test.gif
Also, I notice that the test.gif file is about ten times the
size of the original one.
> On Wed, Apr 7, 2010 at 12:52 AM, Wendell Turner <wendell at enflight.com>wrote:
> > I want to change the color palette on a gif file. The
> > instructions on the wiki here:
> > http://trac.osgeo.org/gdal/wiki/FAQRaster#Howtocreateormodifyanimagecolortable
> > explain how to do it:
> > gdal_translate -of VRT your.tif your.vrt
> > gdal_translate your.vrt your_fixedup.tif
> > but doing this (without editing the .vrt file) changes
> > transparent pixels to white. Is there a way to use
> > gdal_translate to do this and also keep transparent pixels?
> > Or is that related to error message from gimp?
> > .gif: unknown field with tag 42113 (0xa481) encountered
> > (gimp didn't complain about the original image)
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