opj_compress with lossy compression results in strange pixel values #851
Description
When calling opj_compress with lossy compression enabled, I got output pixel values that are completely diffferent than the input pixels. I used the following command (in this case lossy compression with ratio 5):
opj_compress -I -r 5 -i test.tif -o test.jp2
For example, the pixel at position (0,0) in the original TIFF image "test.tif" has pixel value 97, while the corresponding pixel in the output jpeg2000 image "test.jp2" has value 62069. Once could expect that the compressed pixel values are slightly different than the original pixel values, but such a huge difference is strange and unexplainable to me.
Even when I specify a lower compression rate (e.g. rate 2), the huge difference in pixel values remains. When I use lossless compression ("opj_compress -i test.tif -o test.jp2"), the result is as expected (output = input). The compression rate I got when using lossless compression is approx. 3,85.
Attached the test files "test.tif" and "test.jp2". I'm using openjpeg-v2.1.1.