Message-Id: <199608171510.KAA12219@library.wustl.edu> Date: Sat, 17 Aug 1996 11:05:27 -0400 From: Joel Wolfson <mailto:DigiWolf@AOL.COM> Subject: Scanner color correction and film types To: Multiple recipients of list IMAGELIB
Regarding Jeff Huestis questions Aug 16:>Does
>anyone know if there are scanners which specifically correct this problem
>by allowing adjustment *before* the scan?
Yes. Most scanners have this capability to a greater or lesser extent depending upon the individual scanner and software. Usually one performs a preview scan, makes the necessary color adjustments and then performs a final scan at which point those settings are applied. A related factor is whether or not adjustments can be performed at greater bit depth than the standard 8 bits (aka 24 bit for RGB). Most good scanners scan at least 10 bits per color (if not 12). I have had a difficult time trying to find out from various manufacturers whether or not their scanners actually perform color and tonal adjustments at 10 or 12 bits. Agfa's tech rep claimed with certainty that their scanners do apply adjustments at the higher bit depths. Some digital cameras such as Kodak and Leaf allow you to keep the capture file, or "scan" in it's native 12 or 14 bit format and make adjustments after the capture in Photoshop or third party apps like Colorshop (Not many people are aware that Photoshop can support up to 48 bit files, although with limited use of features)
> Have any software packages
>produced menus of standard correction values for different film types?
Again, these are generally integrated with the scanning software. I've seen this method implemented on various scanners. Some are more generic using choices like "Color negative" instead of listing specific films such as "Vericolor".
Hope this helps.
Joel Wolfson Imaging Consulting & Services 3610 N. Stone Crest Street Flagstaff, AZ 86004-6811 Phone: (520) 526-3726 E-mail: mailto:digiwolf@infomagic.com