Nothing? Any ideas at all?
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I have calibrated my Mac's monitor several times
You really do need to get the signal onto a properly calibrated television. Until you do, there's no way to ensure you're seeing the signal accurately.
So a properly calibrated television is better than a properly calibrated monitor? Should I just run the monitor signal to a TV and grade that way?
It's strange though - on my home PC with an unremarkable LG monitor there is zero (or at least, barely noticeable) shift from the source monitor to export to upload - it's 99 per cent consistent. But on the Mac, even comparing the export file to the source monitor the contrast is still off, then becomes WAY off when uploaded to YouTube/Vimeo...
Should I just run the monitor signal to a TV and grade that way?
That would be better, yes. You need to get the operating system, graphics driver and software out of the way of the signal, because all of them can and often do alter the signal. So a device from AJA, Blackmagic, Matrox or BlueFish might be in order. Once you have the signal coming out of PP, you can use a calibration disk to get your TV as close to accurate as possible. I like the Disney WOW disk myself. Very good calibration tool.
It's strange though
Not really. As yet, you have no baseline reference, so variations in display are not all that surprising.
Sorry, just to be clear, when you say a device from any of those brands, are you referring to a television monitor or and an SDI capture device? I've only ever edited within a computer, using native hardware, so I'm a bit confused. Do you mean capture onto something like this: http://www.blackmagicdesign.com/products/intensity/, then edit on any 1080p TV (properly calibrated)?
Any chance your Mac is equipped with a wide gamut monitor?
Or any chance your Mac graphic card performs any sort of colour management, including managing dynamic range?
Do you mean capture onto something like this
Yes, something like that. Besides capture, such devices also serve to get the signal out for proper monitoring.
There is a "Wide Gamut RGB" Display Profile, if that's what you mean. Selecting this makes my source video look extremely flat and desaturated, maybe that's better since I'll grade it with much more contrast? I don't know. The card is an ATI Radeon HD 4670. If it's performing any sort of colour/dynamic range management, how would I go about changing those settings?
There is a "Wide Gamut RGB" Display Profile, if that's what you mean. Selecting this makes my source video look extremely flat and desaturated...
I mean Premiere Pro is not a colour managed ('colour aware') application in nature, and unlike After Effects it normally can't utilise your monitor colour profile so as to display colours properly, it simply transfers colour data from a footage to a display without any conversion/compensation. Meanwhile, Rec.709, the colour space for HD video, is close to sRGB, in which conventional computer monitors operate, whereas wide gamut monitors colour space is something close to Adobe RGB. If you colour corrected your images/footages in a wide gamut colour space, they would look oversaturated on a conventional monitor (see this article about the issue). According to your last note, I guess, that's not exactly what you're facing.
However, you still need to establish proper colour management workflow so as to see proper colours on your Mac. I'm not on a Mac and, therefore, can't be of a great help, but as far as I understand it is argued that Apple ColorSync Utility and AppleScript allow users to set appropriate working space (sRGB in your case, 'cos your goal is to upload your video on YouTube or Vimeo) for any non-'colour aware' application. Check for example this manual for Mac OS Panther or better yet find one for your version of Mac OS.
The card is an ATI Radeon HD 4670. If it's performing any sort of colour/dynamic range management, how would I go about changing those settings?
Well, as far as I understand, there is no advanced graphic card control panel on a Mac, you control everything you're allowed to via System Preferences -> Displays and Appearance...
Hi! I have this same problem and I can't find anyone to answer it. Everyone always over thinks it or blames QT. it's not a calibrated monitor issue because my color is perfect when editing and then on the export it renders with way less saturation and contrast.
All my monitors are calibrated every week.
So the question is why does the video deplete in quality after the render?
I just want someone to tell me why....
I feel your pain cultureshot..
If I ever figure it out ill let you know.
Secret words: colour management.