2008.04.16 13:26 "[Tiff] efficient thumbnailing", by Dr. Michael J. Chudobiak

2008.04.16 15:19 "Re: [Tiff] efficient thumbnailing", by John

2008/4/16 Dr. Michael J. Chudobiak <mjc@avtechpulse.com>:

Is there an efficient way to generate thumbnails from tiff files?

You don't need to load the whole thing into memory, you can loop over an image a scan-line at a time with TIFFReadScanline(). Something like:

for line in image step shrink-factor:
  for y in shrink-factor:
    horizontal shrink line by shrink-facto
  vertical shrink set of horizontally shrunk lines
  output line of shrunk image

You still have to read the whole file, of course, but it shouldn't need much memory.