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June 2009
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2009.06.16 21:50 "Re: Tiff 16 bit and 32 bit images + some more questions about tiff file format", by Keshab Neupane
Hi, Bilevel images only need 1 bit per pixel. Larger values make no sense for bilevel images – I think you have made a mistake in parsing those files. Here, what I get from tiffinfo...please note that these are not normal tiff images but geotiff images.... TIFF Directory at offset 0x8 (8) Image Width: 2160 Image Length: 900 Bits/Sample: 16 Sample Format: unsigned integer Compression Scheme: None Photometric Interpretation: min-is-black Samples/Pixel: 1 Rows/Strip: 1 Planar Configuration: single image plane ==> bps = 16, but bi-level images ?? TIFF Directory at offset 0x8 (8) Image Width: 2160 Image Length: 900 Bits/Sample: 16 Sample Format: signed integer Compression Scheme: None Photometric Interpretation: min-is-black Samples/Pixel: 1 Rows/Strip: 1 Planar Configuration: single image plane ==> bps = 16, but signed integer sample format, and bi-level images ?? TIFF Directory at offset 0xac074 (704628) (why the offset isn't at 8) Image Width: 719 Image Length: 245 Bits/Sample: 32 Sample Format: IEEE floating point Compression Scheme: None Photometric Interpretation: min-is-black Samples/Pixel: 1 Rows/Strip: 2 Planar Configuration: single image plane ==> bps = 32, but bi-level-images and floating point sample format This is what made me confused. Thanks to Chris and Bob for your support. I just started playing with tiff files, definitely a long way to go. :) Cheers, Keshab