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How to apply Pantone skin tones

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  #101  
Old 02-25-2016, 05:30 AM
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marameo marameo is offline
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Re: How to apply Pantone skin tones

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Originally Posted by klev View Post
You haven't given any indication what you see as an advantage in cmyk, so it's hard to comment. What makes channel mixer seem powerful there? I've used it in both cases, and I still don't know your reasoning.
The video where the author changes the colour of the ladybug. I coundn't do it in Channel Mixer RGB. The author himself claims the benefit of having shadow information in the K channel.
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  #102  
Old 02-25-2016, 10:07 AM
skoobey skoobey is offline
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Re: How to apply Pantone skin tones

You are overthinking it yet again.
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  #103  
Old 02-25-2016, 11:15 AM
klev klev is offline
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Re: How to apply Pantone skin tones

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Originally Posted by marameo View Post
The video where the author changes the colour of the ladybug. I coundn't do it in Channel Mixer RGB. The author himself claims the benefit of having shadow information in the K channel.
You can experiment, but you're likely to bump into one or more of the reasons I don't work this way. Make sure that you alleviate any potential clipping issues before you convert rgb --> cmyk or cmyk --> rgb. Otherwise you will lose detail. This can be a case of too bright or too saturated. The black channel will have clipping in cmyk. The other channels should not experience clipping.

I didn't look at what cmyk profile he used. They can specify different ink limits, which will be respected during conversion from rgb.
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  #104  
Old 02-25-2016, 02:33 PM
skoobey skoobey is offline
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Re: How to apply Pantone skin tones

If we change any of the color aspects, like the hue, saturation, or lightness, you are affecting how that color is affecting it's surroundings, and vice versa. Meaning that you most likely have to shade, and do additional color corrections to the surroundings, or it will look "pasted on".

So the short answer being, there is no point to trying to change color with a tool you don't find intuitive, you can just use the ones you know, because whatever you do you'll likely have to do some manual adjustment anyway. Selective color adjustments like selective color, hue saturation and black and white can be very effective methods to reduce the number of masks needed, but none of those are perfect as Photoshop is a raster-based program after all, and every pixel has it's own individual values, so the more you push, the more apparent differences in values between pixels become.
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  #105  
Old 02-25-2016, 04:16 PM
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Re: How to apply Pantone skin tones

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Originally Posted by skoobey View Post
there is no point to trying to change color with a tool you don't find intuitive
I believe I have come to find the Channel Mixer intuitive the way I see it now.

This is the starting point, regular CMYK colours (foto)

To add yellow on the cyan I target Yellow in the output channel and move the cyan slider to the right until I get green (foto)

To add yellow on the magenta I target Yellow and move the magenta slider to the right until I get red (foto)

To add magenta to the yellow and remove from the magenta I target Magenta and move the yellow slider to the right (until I get red) then move the magenta slider to zero (until I get yellow) (foto)

Apparently, this seems to give a lot of ways to colour.
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  #106  
Old 02-25-2016, 06:09 PM
skoobey skoobey is offline
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Re: How to apply Pantone skin tones

I thought you were working on an image... keep experimenting, experimenting is good for you.
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  #107  
Old 02-25-2016, 07:16 PM
klev klev is offline
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Re: How to apply Pantone skin tones

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Originally Posted by marameo View Post
I believe I have come to find the Channel Mixer intuitive the way I see it now.

This is the starting point, regular CMYK colours
Most people referring to "regular" cmyk mean one of the swop web profiles, since it's the default. I would suggest you pick something with a 350% ink limit instead. Check cyan, magenta, and yellow for clipping. If there is clipping step back in history, resolve it in rgb, then convert again. You may need to do the same when converting back to rgb.

With some software, especially older color engines, it's also possible to run into signed value problems with the profile connection space. Thankfully this isn't typical.
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  #108  
Old 02-25-2016, 07:23 PM
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Re: How to apply Pantone skin tones

There's no such thing a 'regular' CMYK! It's like saying 'regular' human being. Again, CMYK is a highly device dependent output color space.
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  #109  
Old 02-26-2016, 04:38 AM
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Re: How to apply Pantone skin tones

CMYK profile is SWOP (Coated), 20%, GCR, Medium (350% Ink Limit).

If I ever printed I think I'd have to bring it down to 300% though.
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  #110  
Old 02-26-2016, 01:49 PM
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andrewrodney andrewrodney is offline
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Re: How to apply Pantone skin tones

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Originally Posted by marameo View Post
CMYK profile is SWOP (Coated), 20%, GCR, Medium (350% Ink Limit).
If I ever printed I think I'd have to bring it down to 300% though.
I probably shouldn’t ask, but why would you say that?
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