AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2005.05.31 19:41 "[Tiff] hot to detect corrupt tif file", by Gordon Hu
2005.05.31 23:46 "Re: [Tiff] hot to detect corrupt tif file", by Bruno Ledoux
2005.05.31 23:52 "Re: [Tiff] hot to detect corrupt tif file", by Edward Lam
2005.05.31 23:56 "Re: [Tiff] hot to detect corrupt tif file", by Andy Cave
2005.06.01 00:02 "Re: [Tiff] hot to detect corrupt tif file", by Bob Friesenhahn
2005.06.01 00:11 "Re: [Tiff] hot to detect corrupt tif file", by Andy Cave
2005.06.01 00:45 "Re: [Tiff] hot to detect corrupt tif file", by Bob Friesenhahn
2005.06.01 00:50 "Re: [Tiff] hot to detect corrupt tif file", by Andy Cave
2005.06.01 01:02 "Re: [Tiff] hot to detect corrupt tif file", by Bob Friesenhahn
2005.06.02 13:21 "[Tiff] Re: how to detect corrupt tif file", by Gordon Hu
2005.06.02 15:11 "Re: [Tiff] Re: how to detect corrupt tif file", by Antoine
2005.06.02 15:38 "Re: [Tiff] Re: how to detect corrupt tif file", by Edward Lam
2005.06.02 15:50 "Re: [Tiff] Re: how to detect corrupt tif file", by Antoine

2005.06.01 01:02 "Re: [Tiff] hot to detect corrupt tif file", by Bob Friesenhahn

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
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Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/