Why brightness changes when subtitles appear?

Good evening, I’d like to ask for advice about a problem I found on iTunes running on Mavericks. I convert a video content (using handbrake) adding subtitles from .srt file. When I watch that movie, if (and onlu when) subtitles appear, picture brightness becomes clearer. The same file opened using VLC has no problem. My mac mini (latest generation entry-level) is connected via HDMI to a LCD TV. Searching the net I found nothing, does anyone have an idea on how to fix it? Thanks!

I am experiencing the same issue and it seems to be indeed a problem caused solely by iTunes as I only see this issue with movies (rented from the iTunes store and) played back with iTunes. Streaming videos in Safari (e.g. Netflix) and activating subtitles doesn't show the brightness adjustment issues.
It's really annoying as dark movie scenes become almost unwatchable as the brightness level changes all the time. I hope that Apple will fix this issue in the next release of iTunes or Mavericks whichever is causing this issue. In the meantime, I will look for alternative movie players. I'll give VLC a try, but wonder if it can play back movies rented from the iTunes store.

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So, I'm pretty confused. I created an .stl closed caption file in MovieCaptioner which I then imported into DVD Studio Pro. Understandibly (if not, annoyingly), I lost my original subtitle formatting, including font size, color, font, and the black bar I had originally positioned the text over to make it easier to read.
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CanonMan49 a écrit:
Thanks for your reply Michel ...
The colour setting in both Editor and Organiser is: 'Always Optimise Colours for Computer Screens'
I believe this option will select the sRGB colour space by default and that the option 'Always Optimise for Printing' will default the colour space setting to Adobe RGB. Is this so? I only print occasionally (most of my viewing is on the monitor or the TV) but it would be nice to know if the chosen colour space chosen produce this odd effect I'm experiencing (although I sincerely doubt that it's got anything to do with it).
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My camera (EOS 5D MkIII) is always set to sRGB. Is this significant?
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Why brightness changes when subtitles appear?

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