How to identify a resampling filter
Posted: 2011-11-08T17:52:47-07:00
I'm interested in evaluating applications to figure out what image scaling algorithms they use, and how well those algorithms are implemented. So, I'm working on a little utility to help do that. It uses strategically-designed source images that you resize, then use it to analyze.
In part, it does what the im_profile script does, but it can also do another kind of analysis that works better when downscaling. I think my demonstration page about web browsers gives a good overview.
I'm open to suggestions or comments. Is there a better way to do this? Can anyone help make sense of some of the results? For example, can you explain this graph?
![Image](http://entropymine.com/jason/temp/out-ds-safari-554-1.png)
Is it an error, or is Safari using an algorithm that I'm not familiar with?
In part, it does what the im_profile script does, but it can also do another kind of analysis that works better when downscaling. I think my demonstration page about web browsers gives a good overview.
I'm open to suggestions or comments. Is there a better way to do this? Can anyone help make sense of some of the results? For example, can you explain this graph?
![Image](http://entropymine.com/jason/temp/out-ds-safari-554-1.png)
Is it an error, or is Safari using an algorithm that I'm not familiar with?