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August 2005

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2005.08.18 20:52 "read-by-scan-line still buffers full strip?", by Mark Pilon

2005.08.18 20:59 "Re: read-by-scan-line still buffers full strip?", by Andrey Kiselev

2005.08.18 20:52 "read-by-scan-line still buffers full strip?", by Mark Pilon

Hi,

I've gotten beyond my libtiff v.3.5.7 troubles and can now read jpeg encoded
images line by line.  I ported 3.7.3 and it seems to be working well.

In an attempt to save memory and to read native pixel values (instead of
RGBA) I'm calling TIFFReadScanline() for an image, [tiffinfo below] and that
func is ultimately calling TIFFFillStrip() which tries to malloc about 66M
to buffer the whole thing - which is more memory than what we have.

this image is one strip of 4420 lines; is there a way/cheat/hack to _really_
access it one line at a time, w/o buffering the whole thing?


thanks,

Mark Pilon mpilon@midrivers.com

TIFF Directory at offset 0x8
  Subfile Type: multi-page document (2 = 0x2)
  Image Width: 4048 Image Length: 4420
  Resolution: 1200, 1200 pixels/inch
  Bits/Sample: 8
  Compression Scheme: LZW
  Photometric Interpretation: RGB color
  Orientation: row 0 top, col 0 lhs
  Samples/Pixel: 3
  Rows/Strip: 4420
  Planar Configuration: single image plane
  Page Number: 0-0