Comparison of screenshot filesize by LosslessCut and VLC

I used a single coloured video to test screenshots taken by LosslessCut and VLC.

Both tests were done on "keyframes" identified by LosslessCut. I think I've done a good job of making sure the VLC screenshots were taken at the exact same frames as LosslessCut.

Here're the filesizes in KB.

                            Test 1            Test 2

                        PNG    JPG    PNG    JPG

VLC                2559    842    2708    932

LosslessCut    3484    803    3621    885

I dont know how to assess image quality though. Therefore, I dont have a conclusion on which has better screenshot quality.

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