Ramble: Masking with Equalize — OZONE Asylum, home of the Mad Scientists

Ramble: Masking with Equalize

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Your Text: Insert Slimies » Insert UBB Code » Close Last Tag \| All Tags UBB Help	[quote]Now, there are two main branches of this technique that I use. I'm only going to talk about one of them.[/quote] Just for shits, gonna talk about the other main branch that I use. One thing I absolutely adore is extracting Lum and then using that. It has its advantages. Unfortunately, it has its disavantages. The big disadvantage being that it's 1d. On the other hand, RGB is 3d. We can take advantage of the 3dness of RGB when it comes to some things. - start with some random photograph - copy to new layer - Filter > Blur > Blur just get rid of some noise - Filter > Stylize > Find Edges What are you now looking at? You should be looking a bunch of white, some black lines, and some lines of various hues. What if you want a yellow line to be just as black as a blue line? Ah, the subject of desaturating with intent has just popped up. I'm trying to keep my feelings out of this, but a great deal of people out there need to STFU when it comes to desaturating. They have no real grasp on contrast, data, or tools. Fuck 'em right in the ear. Let's say you have a photograph of a flower. The petals are blue and the background foliage is dark green. Two seperate elements, pedals and foliage. If you desaturate something like that to Lum, chances are good that the Lum will be a bit washed out between the two and not the best for finding edges between them. Two obviously different hues, and we can use RGB in 3d to find the edges between them. All you have to know is your ChOps. Remember [url=http://tech-slop.serveit.org/wiki/index.php?title=Finding_min]Finding Min[/url] and [url=http://tech-slop.serveit.org/wiki/index.php?title=Finding_max]Finding Max[/url]? Disco if you do. That will take care of the hue and edge problem. All of the edges will have maximum difference from pure white. See? Decide what contrast you are after, see how it is manifested in the data, and then use to tools to amplify it. Rant! Cuss! Rant! Cuss! Stomp feet! Scream! That was Sobel, or Find Edges. What about High Pass using the same idea of maximizing difference? - random photograph - copy to new layer - Filter > Other > High Pass to taste - Edit > Fill -- Use: 50% Grey -- Mode: Difference - ChOps to Find Max Ta-freaking-da. Now ready for further tweaking as you see fit. Levels, Invert, whatever. We took advantage of RGB and found maximum difference in Find Edges and High Pass. This is good when you have lots of hue. Also good with diagrams, logo-ish things, and signs. There is a great deal more to contrast than a handful of the same ol' tricks. And, of course, if you understand what I'm babbling about, you should be able to adapt things to your own flow as needed. You don't always need maximum difference in Find Edges, and you don't have to use Finding Min/Max to get it. Rawr! [small](Edited by [url=http://www.ozoneasylum.com/user/351]warjournal[/url] on 10-02-2006 07:36)[/small] Loading...
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