On Sat, 1 Mar 2003 02:52:03 +0100, Ive wrote:

> Thats what I do call blue and does
> in fact not exist in the original image because these blue shifts are produced
> by the resampling filter. And thats what I did try to say.
> 
> -Ive

It's visible to me that there was a blue *shift* in the original image, but 
since the main colour in the image was yellow, the resulting edge colour 
was closer to green. I've attached another image where the main colour was 
corrected to make the main colour white and you can visibly see the left 
column is red and the right column is blue. The only filter applied is a 
RGB multiply filter with gamma taken into account. And I do think you're 
right in one way about the first enlargement filter. It makes the right 
edge appear more blue but the shift *towards* blue was already present in 
the image. I've never known of any resample filter that treated different 
colour channels differently and I think that this one is no different.

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