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Posted on 17/08/06 11:06:51 PM |
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michael sinclair
Off-Topic Opportunist Posts: 1871 Reply  |
What's the difference between the two neutral grey methods?
When I choose New Layer and select a Blending Mode I get the option of "Fill with 50% neutral grey (pic1); alternatively, I can choose Selective colour Options and select Neutral Grey(pic2). Two questions: why are neutral greys needed, and what do the "Relative" and "Absolute" do? Edit: why does a clear screen shot become degraded when uploaded? Mike |
Posted on 17/08/06 11:09:35 PM |
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michael sinclair
Off-Topic Opportunist Posts: 1871 Reply |
Re: What's the difference between the two neutral grey methods?
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Posted on 17/08/06 11:10:36 PM |
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michael sinclair
Off-Topic Opportunist Posts: 1871 Reply |
Re: What's the difference between the two neutral grey methods?
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Posted on 18/08/06 07:55:24 AM |
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Bob
Expert Expressionist Posts: 130 Reply  |
Re: What's the difference between the two neutral grey methods?
Mike, You are talking about two entirely different things here. First the new layer blending mode: Notice that the message next to the check box says "neutral color". Certain blending modes have "neutral colors" that will not affect the underlying image. For some blending modes that is white, others have black, or 50% grey. Some blending modes do not have a neutral color at all. Painting with a shade other than the neutral color will affect the image in a way that depends on the blending mode. For example, a soft light layer filled with the neutral color and painted on with a low opacity white or black brush effectively creates a non-destructive dodge/burn layer. See this link for a description and discussion of the various blend mode/neutral color effects. http://www.adobeevangelists.com/pdfs/photoshop/Blendmodemagic.pdf Any method that will fill the layer with the neutral color is acceptable. The checkbox in the new layer dialog is a handy shortcut which has the advantage that you don't have to remember which color is the neutral color. Selective color, on the other hand, is used to adjust the amount of process colors in each of the primary color components. It's generally used in making separations. It works internally in cmyk but can be used with rgb images. "Relative" changes the amount relative to the components percentage of the total. For example a pixel with 60% cyan increased by 10% will result in 66% (10% of 60 is 6). "Absolute" works on the absolute values 60% increased by 10% is 70%. |
Posted on 18/08/06 2:44:11 PM |
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michael sinclair
Off-Topic Opportunist Posts: 1871 Reply |
Re: What's the difference between the two neutral grey methods?
Thanks Bob, thats one less thing to worry about. Mike  |