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Colourspace gurus - help please!


jimthistle73 10 2.4k 1 United Kingdom
20 Dec 2011 11:44AM
Morning all.

I'm having occasional printing issues - it's happening with cheap online printing (Photobox) and with my local pro lab too. The prints have the same issues no matter where I print them.

So I have a nice photo of a couple at a church door (for instance). Skin tones look great, nice punchy curves layer, but nothing over the top. It comes back from the printers looking a bit washed out, the couple have yellowy-grey skin and there's hardly any red at all.

It is only an occasional problem - I've got round it in the past by just knocking the red channel up to silly amounts but the prints still aren't the best. I callibrate my monitor frequently with a Spyder2.

Everything goes from Lightroom to Photoshop (if required) and I wonder if the problem is creeping in here? I've just checked some recent 'problem prints' and they all tell me that they are "North American General Purpose" and sRGB so far as I can tell.

However, if I key in; Edit, Assign Profile, it looks like the default is ProPhoto RGB, rather than sRGB - is that right? When I set 'Assign Profile' to sRGB I get all the nasty tones which appear in my prints on my screen.

Image > Mode tells me my files are 8 Bit/Channel, RGB jpegs.

Any help would be amazing - I'm wasting lots of money on reprints and experiments :-(

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GlennH 9 1.9k 1 France
20 Dec 2011 12:00PM
You don't ordinarily need to use 'assign profile'.

Open 'convert to profile' and check the source space. You're probably sending files in too large a colour space, as you suspect, which most labs won't be able to deal with.
User_Removed 10 3.3k 4 United Kingdom
20 Dec 2011 12:02PM
My guess is you're sending stuff in ProPhoto colourspace to a lab which doesn't see that's what it is (or can't handle it) so assigns sRGB. You should convert them to sRGB before sending em off
jimthistle73 10 2.4k 1 United Kingdom
20 Dec 2011 12:04PM
Hi Glenn,

I wouldn't normally 'assign profile' - in fact, until this started happening I never even looked at it Smile When I open 'convert to profile', it looks like it's already on sRGB IEC etc, etc.
jimthistle73 10 2.4k 1 United Kingdom
20 Dec 2011 12:06PM
Hi Chris - how's tricks? Is it possible that when I right click on a LR image, and send it off to PS, it's converting it to ProPhoto do you think?
JJGEE 9 6.4k 18 England
20 Dec 2011 12:07PM
Why are you going into PS ?
jimthistle73 10 2.4k 1 United Kingdom
20 Dec 2011 12:09PM
JJGEE - it's usually for delicate retouching work - most of it could be done in Lightroom, but I find it easier in Photoshop.
User_Removed 10 3.3k 4 United Kingdom
20 Dec 2011 12:09PM
Hi Jamie, I'm good, hope you're well.

I think that could be it, the point where you send it to PS, but some Lightroom or Photoshop setting must come into play at that instant.
GlennH 9 1.9k 1 France
20 Dec 2011 12:10PM
One thing you should ensure is that you have all the profile warning boxes ticked in colour settings, just to warn you of any colour anomalies when the photo is being opened. If you haven't got a profile embedded, for instance, Photoshop makes the assumption that the file is in the same colour space as your Photoshop working space and will encode the colour accordingly, potentially causing colour shifts (the same as the ones you observe in Assign Profile).
User_Removed 10 3.3k 4 United Kingdom
20 Dec 2011 12:12PM
Glenn's hit the nail on the head. If you have the warnings ticked you'll see where and when it's happening.

20-12-2011-12-11-30.jpg

jimthistle73 10 2.4k 1 United Kingdom
20 Dec 2011 12:14PM
Chris, the more I look at the images which I've had bother with, the more I think you're right - the LR>PS>LR thing seems to be the common link.

Glenn, thanks again - I've done that now. As a workaround in the meantime, I'll just export everything from LR first, and open in PS using File>Open.
jembo 11 104 United Kingdom
20 Dec 2011 7:09PM
Ask your lab to put their colour profile on a disc and load it into Photoshop. (That's what I had to do with my local lab).

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