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May 2007
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2007.05.02 16:27 "Re: [TIFF] CCITT RLE image is inverted", by Chris Cox
Photoshop does not use LibTIFF. And as far as I can tell Photoshop is always honoring the interpretation of CCITT images. So, yes, it sounds like Windows Viewer is incorrect (is anyone really surprised?). Chris On 5/2/07 6:00 AM, "tame@lexmark.com" <tame@lexmark.com> wrote: > > 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 > > > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/