Re: filmscanners: Photoshop Curves vs Levels
On Sun, 11 Feb 2001 10:41:19 -0800 Alan Womack ([EMAIL PROTECTED]) wrote: > Is there a fundamental difference between using levels to stretch the histogram versus using > curves to stretch the same with a very steep line? Not necessarily :) Levels changes the gamma pure and simple. Curves do the same if you drag the exact midpoint of the curve in either direction perpendicular to the curve. But if you drag one or more other points or in different directions you will get a more complex mapping. Regards Tony Sleep http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner info & comparisons
Re: filmscanners: Photoshop Curves vs Levels
If the curve(s) are straight lines, linear, then I guess you should be able to do the same adjustment in Levels. This image appears to cry for non-linear adjustment in separate channels. I don't think the real highlights are in skin tones. Bob Wright - Original Message - From: Alan Womack <[EMAIL PROTECTED]> To: Majordomo leben.com <[EMAIL PROTECTED]> Sent: Sunday, February 11, 2001 10:41 AM Subject: filmscanners: Photoshop Curves vs Levels > Last couple of days I was working on a scan from my ScanWit from Fuji Super G 400 of my 2 year old son playing with his trucks. I had used a couple of flash units and screwed up the light level a bit and certainly the background shadows. > > The local minilab printed crap, but the expression was cute.. So into VueScan I went, aweful. Color balance wouldn't come close, way too blue. Also there was bad posterization in highlights from his face. I went to MiraPhoto and found I couldn't control where it placed the actual highlights what so ever, it was mapping the brightest part (those skin reflections) up to 255. Obviously this wouldn't work. > > I took a look at a RAW scan from VueScan in PS and found there was a difference in skin values or maybe 3 RGB and way too much blue. 7-10 points more blue than red, which is typically in my children 30-40 below red when skin tones are in the low 200 range. (the Raw scan was in the 37 to 41 range) > > I then took up a curve that was nearly straight up to move my highlights in tke skin into the 200 neighborhood and spent another couple hours fixing the skin tones. > > So my question is: > > Is there a fundamental difference between using levels to stretch the histogram versus using curves to stretch the same with a very steep line? > > alan >
filmscanners: Photoshop Curves vs Levels
Last couple of days I was working on a scan from my ScanWit from Fuji Super G 400 of my 2 year old son playing with his trucks. I had used a couple of flash units and screwed up the light level a bit and certainly the background shadows. The local minilab printed crap, but the expression was cute.. So into VueScan I went, aweful. Color balance wouldn't come close, way too blue. Also there was bad posterization in highlights from his face. I went to MiraPhoto and found I couldn't control where it placed the actual highlights what so ever, it was mapping the brightest part (those skin reflections) up to 255. Obviously this wouldn't work. I took a look at a RAW scan from VueScan in PS and found there was a difference in skin values or maybe 3 RGB and way too much blue. 7-10 points more blue than red, which is typically in my children 30-40 below red when skin tones are in the low 200 range. (the Raw scan was in the 37 to 41 range) I then took up a curve that was nearly straight up to move my highlights in tke skin into the 200 neighborhood and spent another couple hours fixing the skin tones. So my question is: Is there a fundamental difference between using levels to stretch the histogram versus using curves to stretch the same with a very steep line? alan
