2002.03.13 09:39 "How to use TIFFReadScanLine() method", by Shan
Thread
2002.03.13 22:04 "Re: How to use TIFFReadScanLine() method", by Peter Montgomery
Shan,
Awfully vague question. Here's a vague answer:
Assuming you've read the TIFF header and know A) how big scanlines are, B) how big the image is, and C) have malloc'ed a scanline, just loop through and read the scanline into your buffer
int CurrSL, // Current scanline being read
ReturnVal,
Height; // REad header to figure out how many scanlines are in the TIFF image
TIFF* Tif; // This is your TIF file pointer. Needs to be opened
tdata_t Buf; // Scanline buffer. Needs to be malloc'ed
// Open the TIF file, read header, malloc "buf"
// Once that's done, read each scanline into the buffer
for (CurrSL = 0; CurrSL <Height; CurrSL++){
if (Config == PLANARCONFIG_CONTIG){
// Read a scanline of data
ReturnVal = TIFFReadScanline(Tif, Buf, CurrSL, 0);
if (ReturnVal == -1){
printf("TiffRead() ERROR: Problem reading scanline %d.\n", CurrSL);
break; // We have a problem, bail out now...
}
} else {
printf("TiffRead() ERROR: 1/28/2000 - Can't handle TIFF's with non-contiguous pixel channels.\n");
break; // We have a problem, bail out now...
}
// Do something with the scanline you just read
}
Thanks,
PeterM