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TIFF and LibTiff Mail List Archive

Thread

2001.05.02 12:45 "Pixel Raster (DIB) into TIFF G4", by Wolfram Bettermann
2001.05.02 13:30 "Re: Pixel Raster (DIB) into TIFF G4", by Frank Warmerdam
2001.05.17 18:25 "Tif to Text Conversion", by Dan Longfield
2001.05.17 19:17 "Re: Tif to Text Conversion", by Lee Howard

2001.05.02 12:45 "Pixel Raster (DIB) into TIFF G4", by Wolfram Bettermann

Hi y'all,

I would like to ask you guys for your help. In my app I do have a rectangular pixel raster, width times height, a pure black&white image, where 8 pixel are packed into one byte, aligned to 32 bit boundary (padded with 0, which is the typical Microsofts Device Independent Bitmap version of the raster).

I have tried to convert this packed raster into a TIFF G4 using TIFFWriteEncodedSTrip, but do get an error message that the ImageLength is not set (altough I did with TIFFSetField) but was not sure how to tell libtiff where this raster buffer resides.

My question is, do I first have to unpack the bytes that 1 pixel (1bit) is in ne byte (so width is now really one pixel per byte) and then pass this buffer to libtiff using WriteEncodedStrip? And if yes, how do I pass this raster buffer to the libtiff?

Any help is highly appreciated!

wolfram

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