Re: Accessibilty module for colorblind people

Hi Daniel,

I'm working in add contrast and brightness control over each color
component in gnome-mag. After your e-mail I get in doubt about if this
is a good thing to be able to change. It will be very welcome if you
have any comment about it.

I think that these filters could be implemented easily in gnome-mag.
Probably Bill and Willie can give more advices about it.

To the others that answeared your question about xorg question in you
first e-mail, why it's better to work on Xorg server than GTK+? GTK+ is
not portable enough for this? GTK+ is a very big library for everyone
use? There are graphical users/developers that does not use GTK+?


Em Sex, 2006-10-06 às 16:29 +0100, Daniel Ruoso escreveu:
> Hi,
> I am colorblind. This problem doesn't cause much trouble, so it's not
> something that really makes the computer useless without an
> accessibility software. It would be better if everyone could take that
> into consideration before drawing a chart, but unfortunally that isn't
> always true. Sometimes a chart uses brown-green, purple-blue
> combinations which are just useless for my type of colorblindness.
> Here is my plan so far:
> 1) Create a library with a set of predefined color filters usefull for
> colorblinds, for instance:
>  * selective red saturation:
>    This would take colors where red is one of the dominants (except 
>    gray) and would saturate it to the maximum. So people with problem in
>    the red cones can differentiate brown from red and purple from blue.
>    Example: #555500 becomes #FF5500.
>  * selective red dessaturation:
>    This is the inverse of the above.
>    Example: #555500 becomes #005500.
>  * Hue shift
>    This would displace the hue, preserving saturation and value.
>    Example: #555500 becomes #005555.
>  * monocrome
>    This would take a base color and turn all the others to greyscale.
> 2) Integrate it with the desktop in a way that I press a keystroke and
> activate my default filter with the default settings. Or use a window
> button (at the side of minimize, for instance) to get to a filters menu
> where I can activate any other filter at any time in any window.
> This way, when seeing a chart with dubious colors I could just press the
> keystroke to read the chart and then press the keystroke again to
> continue using the software (or continue to using it with the filter
> active).
> 3) Have a accessibility configuration which would perform the ishihara
> test for those who doesn't know which time of colorblindness they have
> indicating what filter would be the most usefull in most cases (for
> example, the selective red saturation for mine colorblindness but
> probably selective green saturation for other type and so on).
> Here is what I did so far:
> For now I have the base library (still not in some public place just
> because I still didn't found one. But the license will be public
> domain.). I already have 3 functional filters.
> The library is being developed in C using test-driven-development. And
> the basic idea is that it takes a xlib XColor compatible pointer, see if
> it needs to be changed and then change it returning if the color has or
> has not been changed.
> So, what do others think about the idea?
> Which is the better way to integrate this into metacity and gnome?
> I was thinking composite management could help, but I'm not sure.
> Well, this is just a kick-off. If someone could offer some place to host
> the sources, nice (I just didn't want to start yet another project in
> sourceforge...)
> Thanks in advance,
> Daniel Ruoso
> P.S.: Please include-me in replies, I'm not subscribed.
> _______________________________________________
> gnome-accessibility-list mailing list
> gnome-accessibility-list gnome org


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