Re: Resizing changes sharpness

[Stephane Delcroix <stephane delcroix org>]

Hi,

Currently f-spot uses a bilinear algorithm to resize images. It's not
the best in class, but it's quite good. But f-spot doesn't use any
resharpening after resizing. And evaluating resizing capabilities of a
photo software with a non-photo image is not really fair ;)

I can do some tests with an hyperbolic algorithm, and with some extra
sharpening, but I'll need some eyes (and maybe some test pictures) to
evaluate the results. In the meantime, can you send me your original
test image ?

regards

s




On Sun, 2007-07-29 at 12:42 +0200, Jurian Sluiman wrote:
> Hi all,
> I'm using f-spot for quite a time now, but every time I want to resize
> a picture, the sharpness changes significantly. I compared the resizes
> from f-spot, eog, gThumb and flickr, and it seems f-spot has the worst
> resizing algorithm. To see the differences, compare these two
> pictures:
> http://download.juriansluiman.nl/fspot/fspot.jpg
> http://download.juriansluiman.nl/fspot/flickr.jpg
> 
> It's clear the flickr resized picture is more sharpened than the fspot
> one. I couldn't find anything about it on the wiki or the archives, so
> I'm asking it here. I really like the program, all the features and
> the usability. But the resizing problem struggles me. Is it possible
> to fix it?
> 
> Thanks a lot, you're doing a great job ;)
> 
> Jurian Sluiman 
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-- 
Stephane Delcroix
stephane delcroix org