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

[ryunoki openmailbox org]

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.