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October 2007
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2007.11.15 15:45 "Re: Simple code to write Tiff images from Raw data", by Frank Warmerdam
Ron Croonenberg wrote: > Hello Frank, > > here's the tiffinfo: > > the first one is the one I built using the tifflib. The 2nd one is the > same image but viewed and than saved as a tiff with irfanview. > > After I built the tiff irfanview and vliv recognize the image but not > too many other viewers (so far I only found irfanview and vliv to read > them). After I opened the tiff and saved it again as a tiff all viewers > so far can read it. > > So I figured I must have done something wrong or forgot something. > > btw: After irfanview saves the file below it's size grows > from 4.96Mb to 8.71M (but that's due to compression. apparently > irFanview doesn't create "deflated" files ?) > > TIFF Directory at offset 0x4f6222 (5202466) > Image Width: 4096 Image Length: 3072 > Bits/Sample: 8 > Compression Scheme: Deflate > Photometric Interpretation: RGB color > Orientation: row 0 top, col 0 lhs > Samples/Pixel: 3 > Rows/Strip: 16 > Planar Configuration: single image plane > ImageDescription: 3D Simulation > Predictor: none 1 (0x1) > [ronc@wolf359 ~]$ tiffinfo fractal_3a.tif > TIFF Directory at offset 0x8b1f42 (9117506) > Image Width: 4096 Image Length: 3072 > Resolution: 0, 0 pixels/inch > Bits/Sample: 8 > Compression Scheme: LZW > Photometric Interpretation: RGB color > Orientation: row 0 top, col 0 lhs > Samples/Pixel: 3 > Rows/Strip: 1 > Planar Configuration: single image plane > Software: IrfanView Ron, The most obvious issue here is that you used the Deflate compression scheme which is relatively new, and not very widely supported while Irfanview used LZW which is more widely supported. I'd guess that is the source of the problem. 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