Re: Irlen Syndrome / colour tinting extension

[Joseph Scheuhammer <clown alum mit edu>]

Hi,

> How easy do people think it would be to write a colour tinting
> extension for the benefit of those with Irlen Syndrome [1]?

The *functionality* is available in the gnome shell magnifier in the 
upcoming GNOME 3.6 release.  One can change the brightness and contrast 
of each of the R, G, and B channels.  What's missing is a GUI to do this.

You can try it out (after enabling the magnifier) by using gsettings 
from the command line.  For example:

gsettings set org.gnome.desktop.a11y.magnifier brightness-red 0.75

This will result in a reddish tint.

The relevant gsettings are:
brightness-red
brightness-green
brightness-blue
contrast-red
contrast-green
contrast-blue.

The values range from -1.0 to 1.0, where -1.0 removes the contribution 
of the channel, 0.0 means "no change", and 1.0 sets it to the maximum.  
Be careful:  it's possible to end up with an colour combination that 
makes the screen contents impossible to see (yes, there needs to be a GUI).

Would this suffice?

See also: https://bugzilla.gnome.org/show_bug.cgi?id=673417

--
;;;;joseph.


'A: After all, it isn't rocket science.'
'K: Right. It's merely computer science.'
             - J. D. Klaun -