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May 2005
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2005.06.01 01:02 "Re: hot to detect corrupt tif file", by Bob Friesenhahn
On Wed, 1 Jun 2005, Andy Cave wrote: > > Certainly in printing/prepress, most (if not all) images are compressed. > > Where/why do people not compress them in the RGB/color world? Which > applications don't do this? [Nice to see statements such as this backed up by > 'proof'.] Photoshop and many other software packages (including the one I maintain) default to no compression. So when people say that they have an "80MB" scan, they likely mean that the TIFF file on disk also consumes 80MB. One reason for this may be that one of the best lossless compression algorithms for color images (LZW) was patent encumbered until recently. Uncompressed files have the best chance for interoperability. Compression on RGB images is much less effective than for monochrome images. There is also the performance aspect. If the file is often loaded and saved (common for desktop publishing), doing so is usually faster if the file is not compressed. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/