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May 2007
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2007.05.02 13:00 "[TIFF] CCITT RLE image is inverted", by <tame@lexmark.com>
Hi all, I have a CCITT RLE compressed image with photometric interpretation of MinIsZero that appears "correct" in Windows Viewer, but appears "inverted" in GIMP, Photoshop and IrfanView. >From the output from libtiff, it appears that GIMP, et al is honoring the photometric interpretation, but Windows Viewer is not? I wasn't sure if that was the case, or maybe libtiff is inverting the data before passing back to the caller. I saw the same topic posted in 2004 that says that some viewers may not honor the photometric interpretation, but wasn't sure if that was the case here. Here's the output from tiffinfo and tiffdump TIFF Directory at offset 0x8 (8) Subfile Type: multi-page document (2 = 0x2) Image Width: 200 Image Length: 200 Resolution: 96, 96 pixels/inch Bits/Sample: 1 Compression Scheme: CCITT RLE Photometric Interpretation: min-is-black FillOrder: msb-to-lsb Orientation: row 0 top, col 0 lhs Samples/Pixel: 1 Rows/Strip: 8 Planar Configuration: single image plane Page Number: 0-1 Color Map: (present) Software: Paint Shop Pro 9.0 DateTime: 2006:03:10 13:17:15 Artist: Magic: 0x4949 <little-endian> Version: 0x2a Directory 0: offset 8 (0x8) next 0 (0) SubFileType (254) LONG (4) 1<2> ImageWidth (256) LONG (4) 1<200> ImageLength (257) LONG (4) 1<200> BitsPerSample (258) SHORT (3) 1<1> Compression (259) SHORT (3) 1<2> Photometric (262) SHORT (3) 1<1> FillOrder (266) SHORT (3) 1<1> StripOffsets (273) LONG (4) 25<521 537 585 759 824 882 1051 1104 1195 1361 1393 1434 1506 1529 1564 1732 1816 1856 2026 2099 2173 2339 2388 2423 ...> Orientation (274) SHORT (3) 1<1> SamplesPerPixel (277) SHORT (3) 1<1> RowsPerStrip (278) SHORT (3) 1<8> StripByteCounts (279) LONG (4) 25<16 48 174 65 58 169 53 91 166 32 41 72 23 35 168 84 40 170 73 74 166 49 35 71 ...> XResolution (282) RATIONAL (5) 1<96> YResolution (283) RATIONAL (5) 1<96> ResolutionUnit (296) SHORT (3) 1<2> PageNumber (297) SHORT (3) 2<1 0> Software (305) ASCII (2) 19<Paint Shop Pro 9.0\0> DateTime (306) ASCII (2) 20<2006:03:10 13:17:15\0> Artist (315) ASCII (2) 1<\0> Colormap (320) SHORT (3) 6<65280 0 65280 0 65280 0> Thanks Alot! Elaine