[APML] Histograms, curving and layers

[Alan Voetsch <critter12952@yahoo.com>]

I finally got around to reading Matt's article on
'Curving Your Astrophotos'. I'd like to congratulate
Matt on an informative, well written article. I'm
either getting smarter, or the article is written with
little jargon and tech-talk. Probably the latter. :-)

The text explained one area that has continually
confused me; that was whether to curve individual
channels, or to curve the composite. I also now know
what a histogram needs to look like and that the left
side represents black and the right, white. Thanks
Matt, you may have accomplished the impossible:
getttng me to begin understanding what goes on in PS.

Under 'Anti-vignetting' Matt states that the AV layer
should be under the curve layer. Why? Is a processed
image really just an assemblage of processing layers
as opposed to a single integrated image? Would it
change the appearance much if the layers were
reversed?

Thanks,
Alan


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