seems that videoclips loaded on Kdenlive looks more contrasted.
Maybe a Windows issue, or a video card issue, but my videos when loded on Kdenlive looks like more contrasted. (look at the black spot on the grass on the left of the 3 images)
and if i render a video the result is less/contrasted (real contrast).. and if i re-import the generated (from kdenlive) video on Kdenlive again .. it seems again more contrasted.
Old references about yuv /colors issues:
here what happens when importing a BMP (no color filters, nothing, just a simple BMP)
there are changes from 1 to 2 decimals on colors.
P.S. also colors seems a lot different (looks at project and looks at youtube)
i'm not sure this is an issue with yuv/bits/standards... the only thing i'm sure that the rendering has same colors and contarst using every codec/profile of kdenlive.
EDIT [ME]: Similar issues here, with simple color comparison and a layered gimp file for comparison: https://bugs.kde.org/show_bug.cgi?id=425012. Including test files and a GIMP comparison.