Do you mean yellow left and blue right? Just to make sure the bug is not mainly about left vs. right color, but about the red highlight on a green or yellow background. That red highlight is hard to discriminate for red-green colorblind users ( see http://imgur.com/9AldW for a simulation ).

On Wed, Jul 27, 2011 at 3:52 PM, K. Peachey p858snake@gmail.com wrote:

The proposed change is worse for me, they don't stand out in the diffs....

I suggest we stick to a Yellow and Blue combo, that colour combo has the least and is the most uncommon type of colour blindness compared to the other types which encompass most other colours, thus having the least likeliness to actually affect to those users with colour blindness.

-KP

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Underlines and overlines. I would like to see an experimental version with those.

On 7/27/11 10:38 AM, Ryan Kaldari wrote:

I always thought the French diff interface was much more pleasant than the default one. I like Krinkle's version as well. They could both stand to bump up the contrast a little, but otherwise I think they are an improvement.

Ryan Kaldari

On 7/27/11 7:17 AM, Leo Koppelkamm wrote:

...

Do you mean yellow left and blue right? Just to make sure the bug is not mainly about left vs. right color, but about the red highlight on a green or yellow background. That red highlight is hard to discriminate for red-green colorblind users ( see http://imgur.com/9AldW for a simulation ).

On Wed, Jul 27, 2011 at 3:52 PM, K. Peacheyp858snake@gmail.com wrote:

...

The proposed change is worse for me, they don't stand out in the diffs....

I suggest we stick to a Yellow and Blue combo, that colour combo has the least and is the most uncommon type of colour blindness compared to the other types which encompass most other colours, thus having the least likeliness to actually affect to those users with colour blindness.

-KP

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On Wednesday, July 27, 2011 at 8:33 PM, George Herbert wrote:

Could we get visual mockups of the various proposals, preferably stacked on one page so we can compare them fairly easily?

Red/Green http://commons.wikimedia.org/?debug=true&diff=55008419&withCSS=Media...

Red/Blue http://commons.wikimedia.org/?debug=true&diff=55008419&withCSS=Media...

Optionally without the small grey border:

Red/Green w/o border http://commons.wikimedia.org/?debug=true&diff=55008419&withCSS=Media...

Red/Blue w/o border http://commons.wikimedia.org/?debug=true&diff=55008419&withCSS=Media...

Leo

On 7/27/11 3:49 PM, Maciej Jaros wrote:

I like the first red green (without the border), but if at it there should probably be more distinction between the grey, red and green colours. I was working on a picture on Commons some time ago after being poked by a colour blind person and found out that the problem was not the colour itself, but Value of colours (Value as in HSV model). So what I did is changed one colour a bit and made a greyscale image of the picture and I've then changed a bit more until I was able to differentiate the colours in greyscale mode.

So in this case I would at least change the colours so that unchanged line (grey) would be different (in Value) from the changed line (red/green).

Picking the correct intensity for the colors is something that we can deal with as needs be. The actual colors themselves are more important, from a psychological point of view.

As I said in the bug itself, by using red and green we are (accidentally) making a moral judgement about the revision. Humans are hard-wired to see red as bad and green as good (blood vs. forest/life). Revisions are, by their nature, amoral - so tagging one as "bad" and another as "good" goes against our purpose.

Hence why I say they should be red/blue or green/blue. I originally suggested red/blue because we want to know what was removed, but thinking over it more I think it should be green/blue.

As far as the boxes go, I think they're essential. You should *never* use color alone to indicate important information. Bolding the text and increasing the saturation of the background color is a step, but it's still possible for people with poor vision to mistake these things.

Macular degeneration can make distinguishing color variants difficult (it sort of blurs the point of the eye's focus together), so including express contrast elements (e.g., boxes or lines) helps to offset this. While this thread is nominally about color blindness, I don't think we'll go wrong by increasing scope to a larger set of visual problems.

(Note that we CANNOT and SHOULD NOT design for people with advanced macular degeneration; this is beyond the scope of nearly any visual design. But there are people who have similar problems [cataracts, for instance] that lend to "lighter" versions of the same visual acuity problems.)

Protip: Photoshop has a way to show how things look to color blind people:

View -> Proof Setup -> Color Blindness (there are two options, you should try both)

Then:

View -> Proof Colors

To return to normal, just unset View -> Proof Colors.

Fun facts: There are three major types of color blindness. Two are red/green and one is blue/yellow. The blue/yellow (tritanopia) is rarer.

The *rarest* form of color blindness is called "monochromacy" - black and white vision. It's *extremely* rare. . . unless you live on one specific island in Micronesia.

(There's another kind of monochromacy but it's mostly found in people with really, really bad eyes and its kind of the least of their problems).

(I know all this crap because I once worked for at a company where the CTO was color blind. So it is fairly ingrained in me now.)