Archived posting to the Leica Users Group, 2006/11/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks, Hoppy. I think I'm getting a much better education on PS then I ever expected. Thanks to everybody for helping. Len On Nov 28, 2006, at 7:04 PM, G Hopkinson wrote: > Len, as you know I sent you my attempt off list and a link to > Julianne Kost at Adobeevangelists, where I learnt this approach. > I'd like to add to the suggestions regarding setting the black and > white points. I thought that this might be of interest to others > and maybe promote some discussion. I know that there are some > Photoshop gurus on the list. > As was pointed out you can use thresholds to locate the darkest and > lightest areas, then sample there. But unless those points are > truly pure white and black (which your monitor and print won't > reproduce anyway) you are losing some tonal information there. That > becomes particularly important where the scan is only 8 bit (as in > a jpeg). So you end up with gaps in your histogram, that is not a > smooth range. > So for a white, for example, firstly there has to be one in the > image. Only a specular light source would truly be close. I'd > suggest that you look at the sampled RGB values, find the lowest > value and then adjust the other two channels to the same value. Use > a levels adjustment layer. Now you've neutralised the highlight, > Similar process for the darkest point. > For the mid tones choose a point that you think should be a NEUTRAL > grey. You may not necessarily have or want exactly a mid-tone. > If you do set that point as say 133 and it wasn't close, you are > altering the tonal range once again. It may not be bad, but it may > not be what was there, either. The important point is to adjust the > three channels at that point to be the same value. Use a curve > adjustment layer. > > The other point I mentioned off list is that, once you have > established a corrected version, you can drag the adjustment layer to > other similar images where you have a number to correct. > > Well let's see what our knowledgeable LUG folk think of these > suggestions > > Cheers > Hoppy > -----Original Message----- > From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org > [mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] On > Behalf Of > Don Dory > Sent: Tuesday, 28 November 2006 14:24 > To: Leica Users Group > Subject: Re: [Leica] IMG: Need help with C22 degs > > Len, > You shouldn't panic, this is a relatively easy correction. If > using PS then > open an adjustment layer:levels. Use the white point eye dropper on > something that should be white in the image; you can use the > pointer to find > something near 255,255,255. Then find something that should be > black and do > the same with the black point eyedropper. Most of the time the > color gets > really close at this point. > > This is your original: > http://gallery.leica-users.org/v/DoryG/On-the-road/ > OrchidIsland_1.jpg.html > > and this is what happens after I did the above: > http://gallery.leica-users.org/v/DoryG/On-the-road/ > OrchidIsland_1copy.jpg.html > > Possibly a little bit blue but pretty close to reality as seen by > thirty > year old print film. In actuality I would add another adjustment > layer for > color and tweak in a little bit of yellow back. > > Don > don.dory@gmail.com > > > On 11/27/06, Leonard Taupier <len-1@comcast.net> wrote: >> >> I have a large number of C22 color negatives from the 70's I'm trying >> to scan. I find it impossible to get the color right. I have spent >> hours with the following two images and they still aren't right. Does >> anybody know of a profile for Nikon scanners what will handle C22 >> processed negatives? >> >> Nearly all my old negatives were taken in the Far East in Taiwan, >> Hong Kong, and off shore Islands. About two years worth. >> >> http://gallery.leica-users.org/v/LeonardT/Orchid+Island/ >> OrchidIsland_1.jpg.html >> >> >> http://gallery.leica-users.org/v/LeonardT/Orchid+Island/ >> OrchidIsland_2.jpg.html >> >> Thanks, >> Len >> > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information