To:openjpeg@googlegroups.com Subject:[OpenJPEG] PNG codec for OpenJPEG_v1_3

This could have been the final version for OpenJPEG_v1_3. But the 'tiled image' case and other cases are unsolved.

This codec has been tested with bit_depth: 16, 8, 4, 2; with/without alpha transparency; with color/gray. In both directions: PNG --> J2K --> reversePNG .

READ:

16 Bit and parameters->cp_cinema are not used: I do not know what cp_cinema is.

1,2,4 Bits are expanded to 8 Bits: I do not know whether the library accepts these depths.

READ/WRITE:

Time and Text are not used: I do not know whether the library accepts Time/Text.

If this version should be accepted, I could write the codec for OpenJPEG_v2.

winfried

Thanks Winfried for this patch. I committed it (rev554) but still have problems to make it functional under windows. Currently, an error message will show under WIN32 if you try to (de)compress PNG files.

I tried compiling a libpng static library as we did for libtif, but I can't seem to have a working compilation. I have linking problems, and libtif and libpng libraries don't seem to be happy together.

Experts are welcome ;-)

Hi With current trunk and opj-1.5 version, the build of png and tiff lib seems to be correctly handle.

We should closed this issue.

Best Mickael

Ok. Closing then.