I'm trying to create gtiffs with transparent areas where there are voids between my original images.
I have successfully done it by using an alpha band but this process created 3x larger images. I think partly because of an additional 4th band and partly because I cannot use ycbcr to compress with jpeg. So I thought of using internal masks expecting to get smaller images but cannot get it to work. When converting from the rgba image using -mask 4 I cannot "see" the transparency and get black areas: gdal_translate -b 1 -b 2 -b 3 -ma sk 4 --config GDAL_TIFF_INTERNAL_MASK YES test_alpha.tif test_internalmask.tif I tried looking at the images using qgis and paint.net. Any hints or help appreciated. Thanks, Duarte Duarte Carreira Diretor | Dep. Informa??o Geogr?fica e Cartografia www.edia.pt<http://www.edia.pt> www.alqueva.com.pt<http://www.alqueva.com.pt> Tel. +351 284315100 [http://www.edia.pt/edia/images/edia_logo2.gif]<http://www.edia.pt>
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