Why is the image brighter after converting H264 to Apple Prores 422 in Compressor ?

Hello -
Very strange situation, keep reading please!
I am using Compressor to convert H264 1080p footage from a D600, to Apple Prores 422HQ for editing. Normal.
I am using the default Quicktime Settings named "Apple Prores 422 (HQ)".
The converted file is a bit brighter than the original... Why is this even possible! I find this a bit problematic because I'm loosing some details in the whites, at a way too early stage for signal alterationt!
So I tried different other stuff that you will find interesting:
• changing gamma correction in the codec settings had no effect
• I can see the change happening already in the Preview window
• and this is the best one : if I apply a resize, to anything, like 1919 X 1079, or 1280 X 720... then the color change does not occur, even when exported! If I apply a resize to the same size, then the output is brighter again.
I am proof checking in Quicktime 7 of course, with "FCP compatibility" enabled and disabled.
I know this is a hot topic and there are many unsolved aberrations like this around this topic, but maybe there is something I don't get ?
Thanks

Apple are so thoughful for making us loose the discussion we clicked on after we log in..
Alex CVideo > I am so happy that you wrote about this
Yes: this is the exact problem. Very nice screencap, this is exaclty it (even if I said it 2 times now).
I have a little secret for you:
I read in another discussion saying that he had this problem too.
The only time I ever did in the entire Internet.
here it is :
this guy re-installed her entire system
mac os + final cut systems
and this time it worked.
Right now I prefer to convert to 1079p than risk this entire operation even it it worked 100% lol
At least not right now
but maybe you will be boosted up enough to give it a try
Good luck to all of us and thanks again to Apple for these great moments we spend together talking about their wonderful mysteries

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Why is the image brighter after converting H264 to Apple Prores 422 in Compressor ?

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