Thread

2009.08.15 03:45 "[Tiff] scanline size and image width", by Dave Sun

Question shor version:

why scanlinesize is 1024 while my image width is 512?

Long version of the question is following:

I have 16 bit gray image, 512x512,

when I checked

linesize = TIFFScanlineSize(image);

it gives me 1024;

to read in the image, I used following

buffer = (char*)_TIFFmalloc(linesize*height);

for(int i=0; i< height; i++)

TIFFReadScanline(image, &buffer[i*linesize], i);

It works well.

Now I want to get the pixel values and found that

for(int i=0; i < 512*512; i++){

//cout << i << "\t" << ((uint16 *)buffer)[i] << endl;

imageList.push_back(((uint16 *)buffer)[i]);

}

works. Note 512*512 (image width * image height, but not 1024*512, scanlinesize*image height).

My question is why scanlinesize is twice bigger as the image width?

Thank you.

Any suggestion is welcome.