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Selecting local highlights and local shadows
I feel rather stupid now...i know quite something about behind IHP, FS, illuminosity masks,...but somehow this keeps eluding me, as if it's like being on the tip of my tong...: how to select local highlights and local shadows in order to create masks. Probably with a given radius i guess if i have to put it different what is outside a certain median.... Jul 30 14 11:01 am Link Have you tried color range for highlights and shadows? Jul 30 14 11:07 am Link DevKevin wrote: that doesn't do local does it?... Jul 30 14 11:09 am Link ha got it...but only with creating 2 layars after HiRaLoAm, one to blend "lighten", other to blend "darken" and do a "difference"...the result is respectively 2 masks, 1 for the local lights, other for the local shadows.. But if somebody knows a smarter way? Herman www.hermanvangestel.com Jul 30 14 11:15 am Link Jul 30 14 12:24 pm Link Why do you think luminosity mask wouldn't work? Jul 30 14 12:53 pm Link Tulack wrote: it's not local... it takes only certain "tonalities" in the luminosity....and not the deviation of medians...hence local Jul 30 14 01:12 pm Link If you convert it to TSL would it work? Jul 30 14 02:28 pm Link I guess you want to blur it somewhat and subtract the blur from the original to get the differences. I'm never sure what to do with negative numbers in Photoshop, though. In Nuke or Shake you subtract something and if parts of the image go negative it's no big deal. You can't directly view it, but the data is still fine. This whole "50% gray is like zero" thing seems like a kludge to me. Jul 30 14 02:58 pm Link NothingIsRealButTheGirl wrote: so far i got already..you do that through differences....once you have your 50% mask you can use levels to extract the mask....i guess it must be possible with "Apply Image" as well....must be faster Jul 30 14 03:04 pm Link As an experiment I looked at differences of several high pass layers, and I also looked at differences between an original image and one with Nik > Color Efex Pro > Pro Contrast applied, since that seems to do the local contrast thing already, so why not just capture the differences from it (assuming one has it installed) Jul 30 14 03:09 pm Link creating the masks is possible...just USM generates too weak local contrast detection....any idea? I tried with median....not much luck there too... Jul 30 14 04:39 pm Link Herman van Gestel wrote: I guess I don't totally follow. If you have weak deviations from a gray base then can levels accentuate them to what you need? Jul 30 14 04:46 pm Link Select channels. Open channels palette and Command+click on a channel (even RGB one) to select the channel, then you can enhance the mask with curves or dodge and burn tools. Jul 30 14 10:19 pm Link Jakov Markovic wrote: that doesn't do local contrast (with a radius of 60 pixels for example..), that's based on luminosity instead of the difference of luminosity... Jul 31 14 02:25 am Link NothingIsRealButTheGirl wrote: you are right there...but with USM it takes also quite some of the "even"areas... Jul 31 14 02:26 am Link |
