From: Marko Mäkelä (msmakela_at_gmail.com)
Date: 2007-06-11 10:58:44
On Mon, Jun 11, 2007 at 04:17:38AM +0000, William Levak wrote: > I can extract the images to .ppm with XPDF. > > The first page is 6592 x 5173 x 24 bit, file size 102,301,265. > > I can't find anything to open this file. I run out of memory. Would it help to convert the image to grayscale with pnmtopgm from NetPBM <http://netpbm.sourceforge.net/>? You might also want to try ppmquant. It might also be possible to convert to PNG and use something like pngcrush, pngnq or pngquant, but I believe that it would be more efficient to do the quantization on the uncompressed data. Some 10 years ago, I noticed the lack of memory-efficient image processing tools on GNU/Linux. Back then, it was real trouble to handle an A4-sized scan, when 128 MiB of RAM was considered huge. I have the impression that most free image manipulation tools use a fixed word length, for example, the GIMP might use 8 bits per component. I hope that all bitmap tools will some day support a variable word length, say, 4, 8, 12, or 16 bits per component (12 to 48 bits per pixel in RGB). Marko Message was sent through the cbm-hackers mailing list
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