LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
May 2004
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
2004.05.13 15:17 "Re: Low resource tiff rotation", by Bob Friesenhahn
On Thu, 13 May 2004, Steven Enderle wrote: > This is what i did after trying "convert" of ImageMagick. It uses far > more than 500MB per Image, like "convert" does. As i wrote, the images > are under 150KB. Anyway, it takes 10 or more seconds to process a single > image. Resource consumption may be reduced 50% by building ImageMagick for an 8-bit quantum size rather than 16 bits. You did not describe your image, but I assume that it is monochrome. Rotations to anything but 90 degree increments require that new pixel values be computed in order to avoid distortion. This means that a monochrome image must be promoted to grayscale. If this promotion is not done, then the result will look bad. ImageMagick does its pixel manipulations using RGBA style pixels so it is very inefficient for monochrome images. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us http://www.simplesystems.org/users/bfriesen