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December 2001
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2001.12.10 14:18 "Translation of Tiff", by Harry Williams
I am trying to translate this to a machine which is not supported by TIFFLIB. In the tiff file I do not understand where the image starts. The first 2 bytes are 4949 Next two are 2A00 which is translated to 002A means tiff. Next 4 bites is 0800 0000 translated to 00000008 this is the location of the start of the IFD 00000008 is the offset so the location is the ninth byte and is 2 long. So at location 9 is 1400 this translates to Hex 0014 which shows there are 20 IFD entries. These are the IFD entries FE00 0400 0100 0000 0000 0000 is 00FE 0004 00000001 00000000 New Subfile ype 0001 0300 0100 0000 AB04 0000 is 0100 0003 00000001 000004AB Image Width 0101 0300 0100 0000 3402 0000 is 0101 0003 00000001 00000234 Image Length 0201 0300 0100 0000 0100 0000 is 0102 0003 00000001 00000001 Bits per sample 0301 0300 0100 0000 0400 0000 is 0103 0003 00000001 00000004 Compression 0601 0300 0100 0000 0000 0000 is 0106 0003 00000001 00000000 Photometric 0A01 0300 0100 0000 0100 0000 is 010A 0003 00000001 00000001 Fill Order 0E01 0200 2D00 0000 0001 0000 is 010E 0002 0000002D 00000001 Image Description 1101 0400 0100 0000 5E04 0000 is 0111 0004 00000001 0000045E Strip Offset 1201 0300 0100 0000 0100 0000 is 0112 0003 00000001 00000001 Orientation 1501 0300 0100 0000 0100 0000 is 0115 0003 00000001 00000001 Samples per pixel 1601 0400 0100 0000 3402 0000 is 0116 0004 00000001 00000234 Rows per strip 1701 0400 0100 0000 4024 0000 is 0117 0004 00000001 00002440 Strip Bytes Count 1801 0300 0100 0000 0000 0000 is 0118 0003 00000001 00000000 Min Sample Value 1901 0300 0100 0000 0100 0000 is 0119 0003 00000001 00000001 Max Sample Value 1A01 0500 0100 0000 2D01 0000 is 011A 0005 00000001 0000012D Xresolution 1B01 0500 0100 0000 3501 0000 is 011B 0005 00000001 00000135 Yresolution 1C01 0300 0100 0000 0100 0000 is 011C 0003 00000001 00000001 Planar Config 2501 0400 0100 0000 0000 0000 is 0125 0004 00000001 00000000 T6Option 2801 0300 0100 0000 0200 0000 is 0128 0003 00000001 00000002 Resolution Units That is the IFD description of the image I am sending. My problem now is where is the Image. The strip offset (0111) is 4 bytes long starting at offset 045E which is location is 045F. In 045f is 03 b0 36 64, reversed is 64 36 b0 03. This number is way out of the tiff image. So how do I read the Strip Offset area and translate it to a bit row image? I hope this explains what I need a little better. Reading the Tiff manual it just says this is the Offset1, and they continue .... but I cannot find out how to translate the tiff file to a row image. Here is the stream of the tiff image. I cannot use the tools for tifllib because the machine does not support it yet. ... My question is what is the position for the first part of the image, then next I will probably will have to translate the compression. Thanks Harry