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July 2007
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2007.07.03 13:55 "Re: Big TIFF Compression", by Frank Warmerdam
Andy Cave wrote: > I presume that georeferencing and medical imaging are all 8 bits per > pixel, multi-channel for the former (and possibly latter). Andy, Speaking for geospatial images, they are not all 8bit per pixel. Many are 16bits per pixel (the IKONOS sensor for instance), and scientific data sometimes uses other data types (floating point for instance). Multi-channel (ie. multi-sample) is common but there are also a lot greyscale datasets (one sample per pixel). > I'm interested in hearing real examples as to why BigTIFF is useful for > georeferencing and medical imaging. Are the images really that big? > After compression or only without? Are they big 'cause they are > multi-channel, or multi-page, or uncompressed, or, ...? Geospatial images are often mosaiced into seamless images for large regions. As you can imagine an image with 1m x 1m pixels for the entire united states gets very large. Previously other formats were used for this, or supertiling of many medium sized TIFF files. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | President OSGeo, http://osgeo.org