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2009.12.10 22:31 "Re: YCbCr", by Steve Mills
I used the dump function to see what the differences between the jpeg-compressed cmyk files might be. Here's the output for the file saved in Photoshop CS3, the one that produces incorrect results: TIFFSetField: dummy: Unknown pseudo-tag 65538. Magic: 0x4d4d <big-endian> Version: 0x2a Directory 0: offset 8 (0x8) next 0 (0) SubFileType (254) LONG (4) 1<0> ImageWidth (256) SHORT (3) 1<4> ImageLength (257) SHORT (3) 1<4> BitsPerSample (258) SHORT (3) 4<8 8 8 8> Compression (259) SHORT (3) 1<7> Photometric (262) SHORT (3) 1<5> StripOffsets (273) LONG (4) 1<25360> Orientation (274) SHORT (3) 1<1> SamplesPerPixel (277) SHORT (3) 1<4> RowsPerStrip (278) SHORT (3) 1<4> StripByteCounts (279) LONG (4) 1<128> XResolution (282) RATIONAL (5) 1<72> YResolution (283) RATIONAL (5) 1<72> PlanarConfig (284) SHORT (3) 1<1> ResolutionUnit (296) SHORT (3) 1<2> Software (305) ASCII (2) 30<Adobe Photoshop CS3 Maci ...> DateTime (306) ASCII (2) 20<2009:12:10 15:08:12\0> JPEGTables (347) UNDEFINED (7) 558<0xff 0xd8 0xff 0xdb 00 0x84 00 0x2 0x2 0x2 0x2 0x2 0x2 0x2 0x2 0x2 0x2 0x3 0x2 0x2 0x2 0x3 0x4 0x3 ...> 700 (0x2bc) BYTE (1) 15890<0x3c 0x3f 0x78 0x70 0x61 0x63 0x6b 0x65 0x74 0x20 0x62 0x65 0x67 0x69 0x6e 0x3d 0x22 0xef 0xbb 0xbf 0x22 0x20 0x69 0x64 ...> 33723 (0x83bb) LONG (4) 2<469893120 33554432> 34377 (0x8649) BYTE (1) 8552<0x38 0x42 0x49 0x4d 0x4 0x4 00 00 00 00 00 0x7 0x1c 0x2 00 00 0x2 00 00 00 0x38 0x42 0x49 0x4d ...> 34665 (0x8769) LONG (4) 1<25488> And here's the file from CS4, which produces correct results: TIFFSetField: dummy: Unknown pseudo-tag 65538. Magic: 0x4d4d <big-endian> Version: 0x2a Directory 0: offset 8 (0x8) next 0 (0) SubFileType (254) LONG (4) 1<0> ImageWidth (256) SHORT (3) 1<4> ImageLength (257) SHORT (3) 1<4> BitsPerSample (258) SHORT (3) 4<8 8 8 8> Compression (259) SHORT (3) 1<7> Photometric (262) SHORT (3) 1<5> StripOffsets (273) LONG (4) 1<18814> Orientation (274) SHORT (3) 1<1> SamplesPerPixel (277) SHORT (3) 1<4> RowsPerStrip (278) SHORT (3) 1<4> StripByteCounts (279) LONG (4) 1<117> XResolution (282) RATIONAL (5) 1<72> YResolution (283) RATIONAL (5) 1<72> PlanarConfig (284) SHORT (3) 1<1> ResolutionUnit (296) SHORT (3) 1<2> Software (305) ASCII (2) 30<Adobe Photoshop CS4 Maci ...> DateTime (306) ASCII (2) 20<2009:12:10 14:35:21\0> JPEGTables (347) UNDEFINED (7) 285<0xff 0xd8 0xff 0xdb 00 0x43 00 0x2 0x2 0x2 0x2 0x2 0x2 0x2 0x2 0x2 0x2 0x3 0x2 0x2 0x2 0x3 0x4 0x3 ...> 700 (0x2bc) BYTE (1) 15863<0x3c 0x3f 0x78 0x70 0x61 0x63 0x6b 0x65 0x74 0x20 0x62 0x65 0x67 0x69 0x6e 0x3d 0x22 0xef 0xbb 0xbf 0x22 0x20 0x69 0x64 ...> 34377 (0x8649) BYTE (1) 2324<0x38 0x42 0x49 0x4d 0x4 0x25 00 00 00 00 00 0x10 00 00 00 00 00 00 00 00 00 00 00 00 ...> 34665 (0x8769) LONG (4) 1<18932> The StripOffsets and StripByteCounts are different, as are the JPEGTables. I certainly don't understand any of that, but shouldn't we expect the same row data for each row read? _________________________________________________________ Steve Mills Me: 952-401-6255 Senior Software Architect MultiAd smills@multiad.com www.multi-ad.com