08/03/2008, 05:53 AM
Edit: apparently the date on the paper is 1/5/2006, I wonder why it's on their front page then :@
Stuffit, known to Mac users for it's series of archiving tools including Stuffit Expander, a tool that will unarchive most formats, has posted a white paper describing two new technologies for compressing images.
One of their new technologies allows users to compress JPEG images a further 20-30% without actually touching the image. This is based on the fact that JPEG processing is made up of two parts: first the image is compressed with lossy techniques, and it's then further compressed with a lossless compression. The output of this process is very random and incompressible by most archivers. To compress this any further, Stuffit simply decompresses the last lossless step of the image, and recompresses the half-compressed image data with a new, optimized algorithm.
The other new technique described involves compressing lossless 24-bit images. This technology can losslessly compress an image to about half the size of the same PNG or TIF image, which is quite impressive.
Both new implementations will be available in the form of Stuffit 9, Stuffit Image and in the future may be incorporated into devices such as digicams, DSLR cameras, phones, and readers such as picture frames and TV box thingies.
The paper can be browsed through here and is quite interesting if you work with images.
Stuffit, known to Mac users for it's series of archiving tools including Stuffit Expander, a tool that will unarchive most formats, has posted a white paper describing two new technologies for compressing images.
One of their new technologies allows users to compress JPEG images a further 20-30% without actually touching the image. This is based on the fact that JPEG processing is made up of two parts: first the image is compressed with lossy techniques, and it's then further compressed with a lossless compression. The output of this process is very random and incompressible by most archivers. To compress this any further, Stuffit simply decompresses the last lossless step of the image, and recompresses the half-compressed image data with a new, optimized algorithm.
The other new technique described involves compressing lossless 24-bit images. This technology can losslessly compress an image to about half the size of the same PNG or TIF image, which is quite impressive.
Both new implementations will be available in the form of Stuffit 9, Stuffit Image and in the future may be incorporated into devices such as digicams, DSLR cameras, phones, and readers such as picture frames and TV box thingies.
The paper can be browsed through here and is quite interesting if you work with images.