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November 2003
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2003.11.17 17:25 "reading Affymetrix tiff images", by Frank Warmerdam
sridhar duggireddy wrote: > Hi , > I am trying to read affymetrix tiff images. As you said before I > printed the tiffinfo. It gave like this: > > sample.tif: Warning, invalid TIFF directory; tags are not sorted in > ascending order. > sample.tif: Warning, TIFF directory is missing required "StripByteCounts" > field, calculating from imagelength. > TIFF Directory at offset 0x8 > Image Width: 4733 Image Length: 4733 > Bits/Sample: 8 > Compression Scheme: None > Photometric Interpretation: min-is-black > Image Description: "[30..46140] PGA-HCL-astM_atop-10aUA-s2:CLS=4733 > RWS=4733 XIN=3 YIN=3 VE=17 2.0 09/04/02 15:32:34 \024 \024 > HG-U133A.1sq \024 \024 \024 \024 \024 \024 \024 \024 \024 6" > Planar Configuration: single image plane > > my tiff image is sample.tif. from the above I understood that my tiff > image doesn't use any compression. It also says single image plane. In the > above output what does XIN and YIN and VE mean? Now can you explain me > with a program(if possible) how to read the image data? one more doubt is > in the above output where should i look for the type of image like is it > scanline-based or strip based or tile based? Sridhar, You asked if this is a stripped or tiled image. The answer is it doesn't include any information on strips so I imagine this means the image is implicitly one big strip. In fact, the image seems pretty poorly populated and missing required fields. Presumably the image has 1 sample per pixel. The values in the Image Description are specific to the generating application, and not a general TIFF thing. You might need to talk to the Affymetrix people to find out more. 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 | Geospatial Programmer for Rent