Pixel density revisited

Started Oct 22, 2008 | Discussions thread
alanr0 Senior Member • Posts: 2,171
Re: Resampling test examples

DSPographer wrote:

Here is the results of resampling an image of a frequency sweep. If
the resampled images had no aliasing then the right half of the
downsampled images would be flat grey.
Here is the original image:
http://farm4.static.flickr.com/3271/2967277913_cef297caf4_o.png
Here is it downsampled to 1/2 width with Gimp cubic interpolation:

Here is is using Gimp's Lanczos3 interpolation:

Thanks for posting. Looks like one or two short cuts too many.

Good to know that Gimp's Lanczos seems to work better than cubic, even if both need a spot of Gaussian blur to avoid aliasing.

Cheers.
--
Alan Robinson

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