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April 2005
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2005.04.27 16:07 "Re: How to find a Image is Bilevel", by Joris Van Damme
Kumar, > 1] How to find an image is only Bilevel image ( black and white ) ? The SamplesPerPixel and BitsPerSample tag are the ones to consult. If both are 1, you've got a single bit per pixel image. Theoretically, this could also be a palette image, though that is rare. If you want to exclude this possibility, check also the PhotometricInterpretation flag, to see if it is either MinIsBlack or MinIsWhite, and not Palette. SamplesPerPixel: http://www.awaresystems.be/imaging/tiff/tifftags/samplesperpixel.html BitsPerSample: http://www.awaresystems.be/imaging/tiff/tifftags/bitspersample.html (note that LibTiff only supports all values being the same, and pretends this is a single value tag to the upper layer) PhotometricInterpretation http://www.awaresystems.be/imaging/tiff/tifftags/photometricinterpretation.html > 2] I am able to read a raw and strip format image using TIFFReadScanline I > do even want to READ TILED IMAGES line by line how do i doso? See http://www.remotesensing.org/libtiff/libtiff.html#Tiles Joris Van Damme info@awaresystems.be http://www.awaresystems.be/ Download your free TIFF tag viewer for windows here: http://www.awaresystems.be/imaging/tiff/astifftagviewer.html