Can you send me a before and after file? Email attachment off-list would be great. sshire@... Stan Shire Associate Professor/Department Chair Photographic Imaging Community College of Philadelphia Adobe Photoshop 6 A.C.E. Author: Hands On Photoshop 7: Tutorial Workshops 215 751-8320 sshire@... -----Original Message----- From: Stephen Kobrin [mailto:skobrin@...] Sent: Tuesday, December 03, 2002 4:09 PM To: DigitalBlackandWhiteThePrint@yahoogroups.com Subject: [Digital BW] Re: Convert to B&W plugins Stan's data seem clear, but all I can say is that when I scan B&W film as rgb, for some negatives, using the channel mixer to convert to grayscale makes a big difference. Steve --- In DigitalBlackandWhiteThePrint@y..., "Shire,Stanley" <sshire@c...> wrote: > Austin: > That was the first thing that I did (look at the channels in the histo display) > tiny, tiny differences. > ----- Original Message ----- > From: Austin Franklin > To: DigitalBlackandWhiteThePrint@y... > Sent: Tuesday, December 03, 2002 1:51 PM > Subject: RE: [Digital BW] Re: Convert to B&W plugins > > > Stan, > > You can just scan the B&W negative, in RGB, and bring it into PS and compare > the three channels. You can compare RGB using the histogram, as well as > compare them visually by hitting <ctl> ~, 1, 2 and 3...for All Channels, > Red, Green, Blue... Depending on the image, you will see anywhere from > small tonal differences, to quite noticeable tonal differences in the > different channels. > > Regards, > > Austin > > > > -----Original Message----- > > From: Shire,Stanley [mailto:sshire@c...] > > Sent: Tuesday, December 03, 2002 1:21 PM > > To: DigitalBlackandWhiteThePrint@y... > > Subject: Re: [Digital BW] Re: Convert to B&W plugins > > > > > > BW neg scans in color neg mode > > > > Quick on-the-fly-between-classes test results > > > > 35mm tmax 100 neg > > Tmax developer > > > > The scans were made on an Imacon 848 and a Coolscan 1000 (I > > figured that the greatest differences would show with these two) > > > > Both scanners set to scan at 8 bit, color neg mode. > > Scan sizes were matched as closely as possible to 25mb > > > > 4 Markers placed in the same areas on each file. Tried to place > > them in areas of differing densities. > > > > Imacon 848 scan > > Marker R G B > > 1 22 22 22 > > 2 255 255 255 > > 3 240 234 234 > > 4 166 165 159 > > > > > > Nikon Coolscan 1000 > > > > Marker R G B > > 1 5 5 4 > > 2 255 255 255 > > 3 206 199 186 > > 4 174 171 166 > > > > Did not correct for density differences between the scans as I > > wanted make no changes to the raw data as it came from the scanners. > > > > > > Interpret this data as you will. My conclusion is that yes, there > > are slight differences with red being higher in density than > > green and blue being ther lowest density. > > > > The similar density differences between the two scans might > > indicate a slight warm color in the film base. > > > > Big conclusion (YMMV): Very minimal difference between scanning > > in RGB and GS modes. > > Very minor tonal changes when converting with the ConvertToBW Pro > > plugin. Not enough (if I were shooting a lot of BW film) to make > > me go with a file that's 3x larger. > > > > Any thoughts appreciated. > > > Yahoo! Groups Sponsor > ADVERTISEMENT > > > > > Please visit the Group Homepage to check the Files, Bookmarks, Polls and other resources as they are often being updated. The page is at: > > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint > > If you wish to receive no emails or just a daily digest, or you wish to unsubscribe, please edit your Membership preferences by visiting this same page. > > Please follow these basic guidelines: > - Include your full name with your message. > - Include the address of your website, if you have one. > - As threads develop, trim off excess portions of earlier messages to keep them short. > - As the topic of a thread changes remember to change the subject header. > - Good manners are required at all time. 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Message
RE: [Digital BW] Re: Convert to B&W plugins
2002-12-04 by Shire,Stanley