ImageMagick downscaling algorithms
When working with ImageMagick, you can use the -filter option
to specify which kind of filtering you want. Here are the types of
Now I will try to run all the scaling methods mentioned on ImageMagick's documentation page to see what they look like.
I'm scaling them up by a factor of 1.62857 for the worst possible result.
As you see the default choice gives a very sharp and well-defined nice
downscaling of the original.
Definately a good choice. It would be
nice to know more about what the different algoritms are good at though, as the
difference between all of them is not entirely obvious.
When i get the time i will expand this test with examples of up-scaling
to further investigate and display the nature of the different algorithms.
See also the browser scaling page on more general info about different scaling algorithms.
Website by Joachim Michaelis