LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
June 1998
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
1998.06.10 16:09 "Re: TIFFGetField syntax and use", by Steven Michael Garcia
Your Message:
>try this:
>
>#include <tiffio.h>
>int photo, bitspersample;
>
>main ()
>{
> TIFF *tif = TIFFOpen("myfile.tif", "r");
> TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &photo);
> TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &bitspersample);
> printf("Photo = %d, Bits/Sample = %d", photo, bitspersample);
> TIFFClose(tif);
>}
>
>
>by the way, i suggest moving to C++ instead of C. much better language.
>
>then for printing you can do this:
>
>cout << "Photo = " << photo << ", Bits/Sample = " << bitspersample << endl;
>
>see how you don't have to worry about the type of the data you are printing.
>:-)
After reading more of the man pages, I tried what you suggested above, by
sending the memory address. Yet when I print out the photo and bits/sample
values, I get some awfully large numbers which I presume are memory address
locations like:
Photo = 4259841
Bits/Sample = 4259848
The funny thing is I have used TIFFGetField for other tags, and it seems
to work just fine. For instance I did
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &length);
printf("Image Length = %d", length);
and I get a correct printout. I passed it the memory location and I was
able to access the value at that memory location (I retrieved 261). So
I'm wondering if there is something screwed up about the PHOTOMETRIC and
BITSPERSAMPLE tags which may not exist with other tags.
Anyone else seen this problem? Is there a completely different way of
accessing the data in those tags I mentioned above?
BTW, I plan on learning C++ soon...I know the advantages are numerous, I just
wanted to learn C first (I think on recommendation). :-) Then I can
learn great things like Java, etc.
Steve
/\ /^\
/^^\ /^^^\
/ \/^\ / \
/ \ \/ \ Steven Garcia Graduate School, Bioengineering
/ \ \ \ steveg@engin.umich.edu Univ. of Michigan