A profile query

[Severin Crisp]

As part of my operation I record many clips off air to a hard disk  
recorder and save them on a disk in DVD format to carry upstairs to my  
computer and save for archive.  In the computer I edit and convert to  
digital video (.dv) using Cinematize 2 Pro.  I then view this on Quick  
Time and save individual frames  (Export/ Movie to Picture/ Millions  
of colours, best quality, no compression) which gives me .pct stills  
which I open in CS3.  Sounds complicated but it is a good working  
system for me.
On opening the .pct file in Photoshop CS3 the dialog notes that the  
file has no embedded profile and gives the usual options.  Whether I  
choose not to colour manage or to Assign my working space profile  
(Adobe RGB(1998)) the opened still frame differs significantly from  
the QT view, usually being significantly darker.  This makes sense as  
it had no profile embedded.   Naturally I can tweak to what I want in  
Photoshop but it would be nice to know what profile it had at an  
earlier time of life, and which presumably is applied in QT,  but  
which has been lost along the way in saving the frame.  If I assigned  
this profile, then converted to Adobe RGB(1998) I should get back to  
the QT view.

Any words of wisdom would be much appreciated!
Severin Crisp

   Assoc Professor R Severin Crisp, FIP, CPhys, FAIP
   15 Thomas St, Mount Clarence, Albany, 6330, Western Australia.
Phone  (08) 9842 1950   (Int'l +61 8 9842 1950)
email  mailto:sevcr...@westnet.com.au




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Re: A profile query

[James Devenish]

Hi Severin,

Since I don't export from Quicktime, I don't know the exact answer to
your question, but typical default profiles are (a) sRGB (which is
like a lowest common denominator) and (b) the source device profile.
I'd assume that QT passes along the colour values provided by your
recorder software, and if that was recording PAL TV (e.g., DVB-T
MPEG), then I'd assume the closest profile is would be the PAL/SECAM
RGB profile in Photoshop. But if you have edited them as DV in
Cinematize, you'd better check the specifics of DV/Cinematize.

Also, in Photoshop, be aware that you may have Proof Colours turned
OFF or turned ON.

Depending on where the images are going to be used, the best strategy
could be to assign PAL/SECAM to the images and them CONVERT the
colours to sRGB as your working space (pretty much the default for
JPEG).

James.

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