Hi Robert, attached a modified jpeg plugin that allows writing of grayscale images.
The attached test app shows that currently (svn 10495) the jpeg writer assumes 3 component images as input. So when a grayscale image is passed in, one either gets a segfault or a corrupted output image.
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osg_jpeg_test.tgz
Description: application/compressed-tar
ReaderWriterJPEG.cpp.gz
Description: GNU Zip compressed data
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