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2007.08.17 14:51 "tiff problems win to mac", by Balint Radics
Dear experts,
I had a working code (32 windows, libtiff 3.7.3) reading Tiff files. I
wanted to use exactly the same on a 64 bit Mac OS X 10.4.10 (cpu powerpc
970) but I get the strange behaviour that while on the windows libtiff
found the pixel values to be 16 bit per sample, on the Mac OS X it sees
them to be 1048576 bits. I don't understand what is going on, please help!
Here is the result of tiffinfo on my tiff files:
TIFF Directory at offset 0x8 (8)
Subfile Type: (0 = 0x0)
Image Width: 1242 Image Length: 1152
Resolution: 72, 72 pixels/inch
Bits/Sample: 16
Sample Format: unsigned integer
Compression Scheme: None
Photometric Interpretation: min-is-black
Smaples/Pixel: 1
Rows/Strip: 1152
Planar Configuration: single image plane
I attached the minimal c++ code that works on 32 windows but doesn't work
on 64 bit Mac OS X. Maybe I have to use additional flags when compiling
under Mac. I have gcc 4.0.1 (powerpc-apple-darwin8-gcc-4.0.1).
#include <tiffio.h>
#include <iostream>
int main(int argc, char * argv[]){
TIFF *Tif;
int bitspersample;
int bytespersample;
int ImageHeight;
int ImageWidth;
int tmpw;
int tmph;
int out;
Tif = TIFFOpen(argv[1], "r");
if (TIFFGetField(Tif, TIFFTAG_IMAGELENGTH, &ImageHeight) == 0 ||
TIFFGetField(Tif, TIFFTAG_IMAGEWIDTH, &ImageWidth) == 0 ||
TIFFGetField(Tif, TIFFTAG_BITSPERSAMPLE, &bitspersample) == 0 ){
std::cerr << "error reading some properities of image " << argv[1] <<
std::endl;
exit(-1);
}
std::cerr << "***Bitspersample: " << bitspersample << std::endl;
std::cerr << "***ImageWidth: " << ImageWidth << std::endl;
std::cerr << "***Image: " << ImageHeight << std::endl;
bytespersample = bitspersample/8;
/* unsigned char * buf;
buf = new unsigned char[TIFFScanlineSize(Tif)];
for (int rows = 0; rows < ImageHeight; rows++){
TIFFReadScanline(Tif, buf, rows);
for (int cols = 0; cols < ImageWidth; cols++){
out = 0;
for (int kk = bytespersample; kk > 0; kk--) {
out <<= 8;
out += buf[cols*bytespersample+kk-1]; //here is the pixel value
}
}
}
delete [] buf;*/
TIFFClose(Tif);
}
Please, help!
Thank you,
Balint