Call for testing: colorblindness vs side-by-side diff

[Harvey Chapman]

On Jul 18, 2012, at 9:17 PM, Michael Forbes wrote:

> On Wed, Jul 18, 2012 at 3:44 PM, Matt Mackall <mpm at selenic.com> wrote:
>> See here:
>> 
>> http://www.selenic.com/hg/comparison/70ebb4bd8083/mercurial/discovery.py
>> 
>> Please report whether the three highlight colors are sufficiently
>> distinct.
> 
> This might help:
> 
> http://www.etre.com/tools/colourblindsimulator/
> 
> I took a screen grab on my Mac and ran it through the simulator (so
> there might have been a slight ColorSync calibration difference
> between what people see on different computers).
> 
> Protanopia makes it hard to distinguish between inserted and replaced.
> This is probably the worst of all, and it is a common form of
> colourblindness, so you might reconsider these two colours so that
> they appear to have different intensities.
> 
> Deuteranopia makes it mildly hard to distinguish all of them
> color-wise, but the intensities seem to be sufficiently different.
> This is the most common form and is probably okay.
> 
> Tritanopia makes deleted and replaced have the same hue, but the
> intensities are quite different, so it is probably fine.

If you have a Mac, there's a program called xScope that can help you. The loupe tool has options for showing the effects of the different types of color blindness. You can run the app in a trial mode.

http://xscopeapp.com/