Re: [Gimp-developer] Gimp from git Gegl Gaussian Blur and Unsharp Mask useability issues

[Michael Henning <drawoc darkrefraction com>]

As a quick correction, gegl's gaussian blur doesn't operate in scRGB,
but rather in babl's linear premultiplied sRGB-primary space (RaGaBaA
float).

babl doesn't really have scRGB formats, although some of the formats
resemble some of the scRGB formats.

On Thu, Dec 5, 2013 at 2:08 PM, Teo Mazars
<mazarst ensimag grenoble-inp fr> wrote:
> Hi,
>
> I have seen the comparison between the old (from gimp 2.8) and the new gaussian blur. I did not have a look 
> at 2.8's implementation yet, but one of the main difference, is that the new implementation works in scRGB 
> instead of sRGB in GIMP 2.8.
>
> I don't know if you were aware about that. I personally would still let the possibility to make it work in 
> both sRGB and scRGB, depending on user's need. Both behavior are useful. But it's still under discussion.
>
> I completely forgot that until now, but Massimo worked on Gaussian-Blur some times ago, and his work is now 
> in operations/workshop (you have to pass --enable-workshop to autogen to build them). This implementation 
> should replace the current implementation at some point, but the behavior is equivalent to the current 
> implementation. I mean all the work you did still applies on the new implementation. The main thing that 
> prevents the replacement is that the case with std-dev < 0.5 is not implemented.
>
> Among all improvements: Waaay faster, even with very large std-dev, it allows setting how edges are handled 
> and finally it fixes the "vertical streaks" bug you were seeing with large std-dev.
>
> I don't answer to the rest because I don't know or I did not though about it yet. Though, we will need to 
> find the equivalent conversion between the 2.8 gblur and GEGL, because 2.10 keeps api compatibility with 
> 2.8 and that includes that all filters should be have the same given the same set of input parameter from 
> the api point of view (that is, not necesserly in the ui).
>
> Regards,
>
> Téo
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