Re: [orca-list] Color name support just added to Orca master

[Peter Vágner <pvdeejay gmail com>]

Hello,
If you would like to review this you may like to check the function
rgbToName(red, green, blue)
In the following file: 
https://git.gnome.org/browse/orca/plain/src/orca/colornames.py

On 13.05.2014 23:36, ryunoki openmailbox org wrote:
> Hello, Christopher and Joanie,
>
> as Mathematician I would say it's a matter of defining the "right"
> distance function.
> Joanie, can you point me to the file, where you determined the nearest
> match? Maybe I can have a look at it.
>
> Regards, André
>
> Am 11.05.2014 21:43, schrieb Joanmarie Diggs:
> > Hey Christopher.
> >
> > All you have to do is convert the RGB values (which we get via AT-SPI2)
> > into hex and look them up. The only tricky part was finding the nearest
> > match when the color is not exactly one of the items in the table. I
> > googled and found an answer to that problem. (Problems are like plots:
> > There are no new ones. <smiles>) And then I tweaked that solution
> > because really dark and really light colors had nearest matches of black
> > and white respectively. The algorithm might need a bit more tweaking,
> > which is something we'll learn over time.
> >
> > The real problem, however, is when applications (or more likely their
> > toolkits) fail to expose the correct RGB value to us. In the case of
> > Epiphany/WebKitGtk, I'm pretty sure the problem is that the colors of
> > parent nodes are not being taken into account when reporting colors to
> > us. And I have vague recollections of Alex Surkov (from Mozilla) solving
> > this problem for Gecko. In the case of Gtk+ apps and VTE, I'm pretty
> > sure there's not an inheritance/parent node problem, but a failure of
> > those toolkits to update the attributes exposed to us. But, again, soon
> > I'll look into that and file the necessary bugs so the developers of the
> > toolkits in question can fix them properly.
> >
> > Take care.
> > --joanie
> >
> > On 05/11/2014 10:44 AM, Christopher Chaltain wrote:
> > > Wow, I'm curious how you did this. I gave it some thought a few years
> > > ago, and I did find a table mapping RGB values to color names, but I
> > > couldn't find an algorithm on line and I couldn't come up with one
> > > myself. I didn't spend that much time on it though, and I'm not the
> > > smartest guy in the world, so it doesn't surprise me that someone else
> > > cracked this nut, but I am curious how you did it. Feel free to ignore
> > > this question or respond to me privately if you don't want to 
> > > discuss it
> > > or take up any list traffic on it. I'm just curious.
>
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