Color Filter for ColorBlind

[Tiago Falcao]

Hi,

First, I would like to introduce myself.  I am a student at a Brazilian University (Unicamp), attending a graduation course entitled "Communitary Informatics".  Me and other 2 fellows are interested in contributing with GCompris, but we can apply the fix filter in lower layer like Cairo to give this option to all cairo based programs.

We would like to know from you if we can try do this and if it is interesting for Cairo Community.

Thanks

--
Tiago Rezende Campos Falcão
http://www.tiagofalcao.com
--
ProFUSION | embedded systems
Computer Systems Laboratory - IC - Unicamp
Grupo Pró Software Livre - Unicamp
Laboratory of Information Systems - IC - Unicamp

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[Øyvind Kolås]

On Wed, Oct 21, 2009 at 5:23 AM, Tiago Rezende Campos Falcao
<tiagofalcao@...> wrote:
> First, I would like to introduce myself.  I am a student at a Brazilian
> University (Unicamp), attending a graduation course entitled "Communitary
> Informatics".  Me and other 2 fellows are interested in contributing with
> GCompris, but we can apply the fix filter in lower layer like Cairo to give
> this option to all cairo based programs.
> We would like to know from you if we can try do this and if it is
> interesting for Cairo Community.

What type of "color filter for color blind" are we talking about here?
One useful for Color Blind people or developers/designers taking such
users into account?

Simulating color deficient vision is simpler than augmenting a color
image with extra contrast helping a color blind person perceive
differences that otherwise would not be perceived.

Simulating color blindness by simply changing individual colors is
useful for designers/developers to understand how different color
deficiencies cause an interface to be perceived and address problems
and can be implemented as a point-filter. I believe a proper filter to
add back the spatial contrast lost by observers with deficient color
vision needs to be a spatial filter (like a blur) on the final UI.

I do believe that both kinds of such filters belong either in the
application(s) themselves or in the window manager/windowing system
along other forms of color profiles.

/Øyvind K.
--
«The future is already here. It's just not very evenly distributed»
                                                 -- William Gibson
http://pippin.gimp.org/                            http://ffii.org/
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[Peter Clifton-2]

On Thu, 2009-10-22 at 10:59 +0100, Øyvind Kolås wrote:

> On Wed, Oct 21, 2009 at 5:23 AM, Tiago Rezende Campos Falcao
> <tiagofalcao@...> wrote:
> > First, I would like to introduce myself.  I am a student at a Brazilian
> > University (Unicamp), attending a graduation course entitled "Communitary
> > Informatics".  Me and other 2 fellows are interested in contributing with
> > GCompris, but we can apply the fix filter in lower layer like Cairo to give
> > this option to all cairo based programs.
> > We would like to know from you if we can try do this and if it is
> > interesting for Cairo Community.
>
> What type of "color filter for color blind" are we talking about here?
> One useful for Color Blind people or developers/designers taking such
> users into account?
>
> Simulating color deficient vision is simpler than augmenting a color
> image with extra contrast helping a color blind person perceive
> differences that otherwise would not be perceived.
>
> Simulating color blindness by simply changing individual colors is
> useful for designers/developers to understand how different color
> deficiencies cause an interface to be perceived and address problems
> and can be implemented as a point-filter. I believe a proper filter to
> add back the spatial contrast lost by observers with deficient color
> vision needs to be a spatial filter (like a blur) on the final UI.
>
> I do believe that both kinds of such filters belong either in the
> application(s) themselves or in the window manager/windowing system
> along other forms of color profiles.

Just a quick note, that if you are using compiz, then you will already
have the feature you need in its accessibility section. I believe it
uses an OpenGL pixel shader (or some other OpenGL-fu) to implement the
filter very efficiently. (I can watch full-screen videos with the filter
enabled with no notable CPU penalty).

Regards,

Peter Clifton

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