Re: Matching profile of image with a QuickTime movie frame?
Re: Matching profile of image with a QuickTime movie frame?
- Subject: Re: Matching profile of image with a QuickTime movie frame?
- From: Dan Wood <email@hidden>
- Date: Fri, 1 Jan 2010 08:31:10 -0800
Happy new year! Thanks, Marco, for your explanation. I'm going to follow up with Scott's latest message since the two are related.
(Also, Thanks Steve for your shot at this -- I did play with changing my monitor's gamma and it changed things a bit, but it didn't quite work enough. Why aren't you on Snow Leopard yet?) :-) :-) :-)
I have tested the screenshot mechanism, using the command-shift-4 and then spacebar technique. It actually does the right thing, but what you end up with is a screenshot of the entire window frame and the shadow around the window too. That's why I pointed out that if I would have to crop the image to the right size, because what I want is the contents of the movie frame, not what the movie looks like in a window.
It sounds like there is just no official way to do this. I'll file a couple of bugs, then: one that QuickTime player 7, in its capacity to copy out a frame of a movie, leaves the image on the clipboard without a profile that can't be matched to what is on the screen, and another that QuickTime Player X doesn't have a facilility to export the current frame to an image at all!
Dan
On Dec 31, 2009, at 5:36 PM, Marco Ugolini wrote:
>
>
> QuickTime Player is not color-managed (at least not in the Mac OS up to 10.5.x, as far as I know, since I'm not yet using 10.6.x) -- which means that what you see on the screen is shown using the currently active monitor profile.
>
> So, the task is really very simple: open the movie in QuickTime Player, stop it at the frame that you wish to make a still of, take a screenshot (Command-Shift-4, then select the area to copy), open the captured screenshot in Photoshop and make sure that it has been assigned the active monitor profile. If it should not open as having an embedded profile at all, or if the embedded profile should be different from the active monitor profile, then assign the latter to the image (important: ASSIGN, do NOT convert!), and it will match what you see in QuickTime.
>
> If you need to publish the image on a web site, for example, then you should CONVERT it from the monitor profile to sRGB (which is often enough the preferred compromise on the web), after which you optimize its size and format for online viewing.
>
On Jan 1, 2010, at 5:33 AM, Scott Martin wrote:
>
> On Dec 31, 2009, at 5:54 PM, Dan Wood wrote:
>
>> Unfortunately, there are some practical issues that make it really tedious ... I'd either have to manually drag a perfect rectangle, or edit the image later to be the correct size. Workable, but tedious.
>
>
> Glad to hear that works well for you too. As for drawing a perfect rectangle, there's an easier way.
>
> 1) Select Shift-Command-4 and then let go
> 2) After a brief, half-second pause, tap the Space Bar
> 3) Using the mouse, put the cursor over the Quicktime player window and left click.
>
> This technique is my favorite screen grab method. It's been around for years and years but is not commonly known. It's a big time saver as it only grabs a particular window at a time which is almost always the desired result. It's color managed and leads to consistent color results. As Marco discussed, I like to convert my screen grabs to sRGB (for the web) or to the appropriate press profile for print work using Photoshop droplets. Leaving the screen grabs in the display profile can make for some large files, especially if you use high res LUT based display profiles. Cheers.
>
> Scott Martin
> www.on-sight.com
>
On Dec 31, 2009, at 5:44 PM, Steve Upton wrote:
> I think there are a couple of things working against you.
>
> QuickTime doesn't use a *profile* to display the movie on screen (as far as I know) but it *might* be assuming something about screen gamma. Up until Snow Leopard the "standard" gamma of a Mac was assumed to be 1.8.
>
> There are certain applications / technologies that use that assumption (DVD Player for one, perhaps QuickTime Player) and the assumption cannot be changed. It has nothing to do with the calibration of your screen or what the current monitor profile is stating the actual display gamma is set to.
>
> So, without reviewing your situation in detail, if your display is calibrated to gamma 2.2 then you might be fighting something in the Quicktime display path. If QuickTime assumes that video is in gamma 2.2 and alters it to be displayed on a gamma 1.8 screen then screen shots with the monitor profile assigned might appear different than frame copies with the monitor profile assigned.... make sense?
>
> You could try a few things as tests:
>
> - calibrate your display to gamma 1.8 (even if just temporarily) and then see if the color difference problem goes away.
>
> - upgrade to Snow Leopard (obviously not the simple test). Snow Leopard reportedly uses gamma 2.2 as the system gamma and so DVD and QuickTime playback on a 2.2-calibrated display should look better (correct).
>
> I'm interested to hear of any results you might have to offer...
>
> regards (and Happy New Year)
>
> Steve
--
Dan Wood
Twitter: http://twitter.com/danwood
Karelia Software — Sandvox for the Mac
http://www.karelia.com/
"According to some estimates we cannot track $2.3 Trillion in transactions"
- Donald Rumsfeld, September 10, 2001
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