Color is not right after jpeg decoding to rgb4

[cvidkal]

System information

• CPU information(model name : Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz):
• GPU information(00:02.0 VGA compatible controller [0300]: Intel Corporation UHD Graphics 620 [8086:5917] (rev 07)):
• Display server if rendering to display(X or wayland):

Issue behavior

Describe the current behavior

I use media sdk sample_decode to decode jpg to rgb4, when I dump the rga4 bytes to png, the color is not same as the original jpg ./sample_decode jpeg -jpeg_rgb -rgb4 -i ~/2.jpeg -gpucopy::on -o test.rgb And I Use OpenCV to load test.rgb, then use imwrite to write png file.

original jpg decoded rgb4 png

Describe the expected behavior

Debug information

• What's libva/libva-utils/gmmlib/media-driver/Media SDK version?
• Could you confirm whether GPU hardware exist or not by ls /dev/dri?
• Could you attach dmesg log if it's GPU hang by dmesg >dmesg.log 2>&1?
• Could you provide vainfo log if possible by vainfo -a >vainfo.log 2>&1?
• Could you provide strace log if possible by strace YOUR_CMD >strace.log 2>&1?
• Could you provide libva trace log if possible? Run cmd export LIBVA_TRACE=/tmp/libva_trace.log first then execute the case.
• Media SDK tracer output (https://github.com/Intel-Media-SDK/MediaSDK/blob/master/tools/tracer/README.md)?
• Do you want to contribute a PR? (yes/no):

[brmarkus]

Can you maybe share the original file 2.jpeg and the dumped file test.rgb, please? Can you confirm the decoded (and converted to RGB4) input is what you expect (e.g. by rendering on the screen)?

[cvidkal]

test.zip 2.jpg and test.rgb are in test.zip above.

The decoded file (test.rgb) I think is 4 channel image (RGBA or BGRA) , I loaded it and use opencv to show, didn't get the same image as the original encoded one (2.jpeg). I don't know what's the problem is. Could you please some advice ?

[brmarkus]

When using the "test.rgb" and display in one of my "raw content viewer" tools then I can see the correct picture when selecting the color-format like "AYUV 4:4:4:4". Are you sure your OpenCV code interprets the raw data in "test.rgb" correctly?

[cvidkal]

Thanks for you reply. I got right result after I removed -jpeg_rgb in command line parameters