AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2001.12.17 11:47 "Newbie need help! Please!", by Juergen May
2001.12.17 16:31 "Re: Newbie need help! Please!", by Joel Schumacher
2001.12.17 18:39 "RE: Newbie need help! Please!", by Poysa, Kari
2001.12.18 00:52 "Re: Newbie need help! Please!", by Takao Matsuda
2001.12.18 01:08 "(Correction)Re: Newbie need help! Please!", by Takao Matsuda

2001.12.17 11:47 "Newbie need help! Please!", by Juergen May

Hi!

I'm a newbie and have a problem understanding the TIFF data structure.

I need to get the resolution of a bi-level TIFF image but can't seem to get the value. I know the resolution is 300 so I'm expecting to find contiguous bytes with the values 1 and 44 (decimal).

Now, if I'm right, the value bytes in the tag 282 (x resolution) act as a pointer. In my instance, the values are as follows -

1    26    - Tag 282
0    5     - Rational type
0    0    0    1    - Count
0    0    0    182  - ???

I don't understand what 182 means!? Is this an offset from the start of the file? If so, the value from 182 are -

0    45    198    192
0    0    39    16
0    45    198    192
0    0    39    16

The expected values (1, 44) are at offset 342 -

1    44    0    0    0    1    0    2

But then I don't know what 0, 1, 0, 2 refer to...

Can someone please help!

Thanks in advance.

Juerg