SIOX

[Boudewijn Rempt]

On Saturday 04 February 2006 19:17, Michael Thaler wrote:
> Hello,
>
> I just wanted to ask if anybody is working on porting the siox foreground
> selection tool from gimp to krita. If not, I might give it a try.

Nobody is working on it, so feel free :-)

> I had a brief look at gimp's siox foreground selection tool. Internally it
> uses a LAB colorspace. It is defined in the following way:
>
> typedef struct
> {
> 	gfloat l;
> 	gfloat a;
> 	gloat b;
> 	gint cardinality;
> } lab;
>
> I was pleased to see that Krita already has functions to convert to and
> from LAB. But Krita uses:
>
> fromLab(float l, float a, float b, float alpha, KisProfileSP profile = 0);
>
> So, l, a, b are identical, but the siox tool uses gint cardinality while
> krita uses float alpha. How are they related?
>
> I had a look at http://en.wikipedia.org/wiki/Lab_color_space, but they
> write nothing about the fourth component. Is there a online article that
> actually describes lab in more detail?

Maybe the SIOX papers give some clue? I've never heard of such a thing.

-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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