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  #11  
Old 07-25-2005, 12:18 AM
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Craig Walters Craig Walters is offline
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hmm, ok, not what i thought it might have been then. so, why would you have to 'compensate in the blacks for dot gain,..' ? do the blacks saturate more or less than the other inks?

Craig
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  #12  
Old 07-25-2005, 08:28 AM
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Wow... Why Black....Think about it Craig...

We talk about 256 "shades of gray". So what does gray consist of in terms of putting the image on paper? Black (ink) and White (paper). Shades of gray in printing are represented by dots of ink or toner. To simplify, solid black consists of big dots printed close together, light gray conisists of smaller dots printed further apart (half toning)

The same basic theory applies when printing four color process (CMYK). Color=ink, White=paper. Other factors come into play in printing such as the resolution capability of the output device, paper absorbtion. Black is the "evil" color because it is used to define the shadows and midtones of all colors. Being able to control black gives you control of all the colors.

Here's an excellent site that explains how to set up PhotoShop to compensate for dot gain http://www.techcolor.com/help/dotgain.html
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  #13  
Old 07-25-2005, 01:21 PM
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a bit more contrast

Hi everybody,

I am a new member of the forum from brasil. Your work is very nice. I just think you need to remove a bit of the red yellowish cast of the image (wich can be done by decreasing a little bit of the red channel curve on its mid range with a curves ajustment layer. after that, simply contrast the image a little bit - on the same curve, by increasing the entry level on the bottom of the RGB curve to 10 and decreasing the top of the curve to 245 (that will contrast the image a bit). After that I did a slight sharpen with a high pass / overlay layer on top of it. Hope you like the suggestions

george rutherford
www.seagullsfly.com
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  #14  
Old 07-25-2005, 04:38 PM
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Thanks rutherford,

on the subject of colour casts, do you think THIS has a slight blue tinge to it?

I can't pinpoint it. ( Ignore the patching work its only just been started. )

I am starting to get the hang of colour correction, although I still have a way to go.

Also, I'm losing the detail on the dark areas, how do I prevent this?

Any suggestions on curve methods here folks, along with the thinking behind your ideas?

Thanks

LP
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  #15  
Old 07-25-2005, 07:05 PM
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LP

You're almost there. There is not enough red so it's heavy on the blue AND green. Do a curves or levels adjustment layer and use the white eye dropper to click in a white area of her shirt. This should bring up the reds.
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  #16  
Old 07-26-2005, 02:19 AM
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Good stuff:
Quote:
Do a curves or levels adjustment layer and use the white eye dropper to click in a white area of her shirt.
I assume you mean on the red channel?
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  #17  
Old 07-26-2005, 05:42 AM
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Sorry... no, on the RGB channel
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  #18  
Old 07-26-2005, 08:26 AM
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dee dee,

thanks for that site link. the first few lines explained dot gain:
Quote:
When working with screens of ink, a designer must always remember that things tend to get darker on a printing press. This happens when the ink absorbs into the paper and spreads outward, making each dot spread out and grow larger.
... the dot gains. ok.

Craig
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  #19  
Old 07-26-2005, 03:19 PM
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What about now, ignore the stains and blotches, I'm concentrating on colour cast.

Hows this?

LINK
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  #20  
Old 07-26-2005, 05:12 PM
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LP, Much Better! :-)
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