>From what Ed said, editing the color table is useless. Try to expand the tiff to rgb and proceed from there. At least the error message should change. ;-)<br><br><div class="gmail_quote">On Mon, Feb 8, 2010 at 8:52 PM, Grissom, Edward (Ed) <span dir="ltr"><<a href="mailto:ed.grissom@intergraph.com">ed.grissom@intergraph.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
Are you aware that the TIFF (and GeoTIFF) spec does not allow you to set<br>
a transparent color ?<br>
<br>
The TIFF spec allows a transparency bit-mask or an alpha channel -- each<br>
of which covers the entire image, but does not allow a specific color<br>
value to be used as transparent.<br>
<br>
I believe that the spec also forbids a alpha channel on the color table<br>
itself. It may allow one on a color indexed image, but it may be that<br>
GDAL has not implemented support for that yet.<br>
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--<br>
ed grissom<br>
<a href="mailto:ed.grissom@intergraph.com">ed.grissom@intergraph.com</a><br>
</font></blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br>/tʃaɪθənjə/ /kʊmɑr/ <br>+91-9848167848<br>17.241582N 80.142635E<br>