For TIFF in B/W, you can use CCITT group4 to do lossless compression. The alg is very simple and I believe it is part of TIFF 6 standard.
For TIFF in grayscale and color, the common approach is not to compress, but you can try to compress them in LZW, a well-known compression alg (see http://en.wikipedia.org/wiki/LZW). However, I believe that you have to monitor the file format very closely. Yan Han University of Arizona libraries -----Original Message----- From: mcn-l-bounces at mcn.edu [mailto:mcn-l-boun...@mcn.edu] On Behalf Of Howard Brainen Sent: Wednesday, January 31, 2007 2:24 PM To: 'Museum Computer Network Listserv' Subject: Re: [MCN-L] compressing TIFFs for museum collection images There is a real question about whether or not you'll be able to read those compressed TIFF's off in the future. That's why the best practice is to store them uncompressed. Storage is 1/2 the price it was 18 months ago and that trend will continue into the future. Howard Brainen Digital Imaging Consultant TWO CAT DIGITAL INC. 14719 Catalina Street San Leandro, CA 94577 USA 510-940-2670 x201 www.twocatdigital.com/consulting.html blog: www.digitalenabler.blogspot.com > -----Original Message----- > From: mcn-l-bounces at mcn.edu [mailto:mcn-l-bounces at mcn.edu] On Behalf > Of Friscia, Jeanne > Sent: Wednesday, January 31, 2007 1:08 PM > To: Museum Computer Network Listserv > Subject: [MCN-L] compressing TIFFs for museum collection images > > We at SFMOMA are on the heels of ingesting our permanent collection > high resolution TIF files into our DAMS system and faced with the > issue of whether or not to use compressed tiffs. While we know that > they represent a lossless standard, we wonder if anyone has thoughts > on issues that may arise concerning corruption, preservation, etc. In > other words, is this really a good idea and are there cons to the pros > of saving storage space? > > Thanks, > > Jeanne Friscia > > > > Jeanne Friscia > > Visual Resources Specialist > > Collections Information Access Department > > SFMOMA > > (415) 357-4103 > > > > > The information contained in this electronic mail message (including > any attachments) is confidential information that may be covered by > the Electronic Communications Privacy Act, > 18 USC Sections 2510-2521, intended only for the use of the individual > or entity named above, and may be privileged. If the reader of this > message is not the intended recipient, you are hereby notified that > any dissemination, distribution, or copying of this communication, or > the taking of any action based on it, is strictly prohibited. If you > have received this communication in error, please immediately notify > me and delete the original message. Thank you > > _______________________________________________ > You are currently subscribed to mcn-l, the listserv of the Museum > Computer Network (http://www.mcn.edu) > > To post to this list, send messages to: mcn-l at mcn.edu > > To unsubscribe or change mcn-l delivery options visit: > http://toronto.mediatrope.com/mailman/listinfo/mcn-l _______________________________________________ You are currently subscribed to mcn-l, the listserv of the Museum Computer Network (http://www.mcn.edu) To post to this list, send messages to: mcn-l at mcn.edu To unsubscribe or change mcn-l delivery options visit: http://toronto.mediatrope.com/mailman/listinfo/mcn-l
