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June 2009
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2009.06.16 21:56 "Re: Tiff 16 bit and 32 bit images + some more questions about tiff file format", by Chris Cox
It doesn't say bilevel, it says min-is-black: aka grayscale. See the TIFF6 spec., section 3. Zero is black, higher values are brighter. For the integer forms, that means that the full scale value is white. For floating point the white point is undefined, but is typically 1.0. Chris On 6/16/09 2:50 PM, "Keshab Neupane" <neupane.keshab@yahoo.com> wrote: 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