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Edges

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Your Text: Insert Slimies » Insert UBB Code » Close Last Tag \| All Tags UBB Help	Just... Edges! Yeah, looking like I'm finally going that way again. Some things have been on my mind for a long time. Going on about a year for this. Maybe a bit longer. I really detest the bulk of the edge mask tutorials out there. As a matter of fact, I have yet to see one that I even come close to liking. One of my beefs is that there is never any preping the photograph. A few hit on this aspect, but most don't. Sure, there is plenty of post, but never any pre. But my biggest beef is the desaturing. OMG this makes a big difference. When desaturing anything, the method makes a difference. RGB is 3d - take advantage damnit. ---- Desaturating Several different methods to try [i]after[/i] running Find Edges: -[url=http://tech-slop.serveit.org/wiki/index.php?title=Finding_min]Finding Minimum[/url] -[url=http://tech-slop.serveit.org/wiki/index.php?title=Finding_max]Finding Maximum[/url] -[url=http://tech-slop.serveit.org/wiki/index.php?title=Extract_luminosity]Extracting Luminosity[/url] - Channel Mixer - Image > Adjustments > Desaturate ([url=http://tech-slop.serveit.org/wiki/index.php?title=Min_Max_Shop]Min Max Shop[/url] for those Win/PC folks. Man, this bauble plug comes in handy. Or you can easily record yourself an action.) ---- Channels In the places were an edge mask is used, greyscale is required. I have yet to see someone use an edge mask in full RGB. What we usually see is RGB > Find Edges > greyscale. But it doesn't have to be like that. Try RGB > greyscale > Find Edges. Now, the greyscale step can be any channel you want - it does not have to be RGB or any of them taken individually. One of the better all-purpose methods is to extract Lum and run Find Edges on that. Or even try this: RGB > Raw Hue > Find Edges > greyscale For even more savviness: RGB > Colour (hue + sat) > Find Edges > greyscale And don't forget that you can use Layer ChOps or regular ChOps to compliment the different methods. Find Edges on Lum, Find Edges on Sat, then Multiply them together. I suppose some of that would fall under [i]pre[/i] tricks. ---- Pre Tricks Rather than wait to try to tease out the data after Find Edges, try to tease it out [i]before[/i] Find Edges. Here is a trick I'm fond of when dealing with low contrast: - Channels > R + Image > Adjustments > Equalize - Channels > G + Image > Adjustments > Equalize - Channels > B + Image > Adjustments > Equalize - RGB + Filter > Stylize Find Edges Or you can try Equalize on full RGB, but I prefer on the seperate channels because of how Equalize works. (Equalize on seperate RGB channels can lead to some interesting colour balance tricks.) Or you can use other adjustment like Auto Levels or whatever. They all work differently and I highly recommend getting to know them. ---- Seems like I am always harping on contrast. To set in opposition in order to show or emphasize differences. That's what Find Edges is all about. Do some reading on Sobel and you'll see what I mean. Where do you want the edges? What differences already exist in those places? How do you tease it out or capitalize on existing differences? Loading...
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