Re: [OSM-talk] Analysis and improvement of the OpenStreetMap street color scheme for users with color vision deficiencies
Please do not mix colour and contrast. A well designed colour map which also respects contrasts might perfectly work either with colours or in black and white. Emphasis on *might*! I assume that you mean contrast in lightness, which was what I meant as well. Contrast can mean different things like the contrast in lightness/luminosity or the contrast between colors. You can have a shade of red and one of green that for normalsighted people obviously are different (because of color contrast), but are so similar in luminosity that in greyscale there would be no difference (no lightness/luminosity contrast). With color you have three parameters (RGB, CMY, HSL, Lab, etc.). Colorblindnesses reduce this to two (one color is deficient or missing, the others remain). Greyscale to one (Lightness). This is important when you want people to be able to identify features, not just make out their shapes in contrast to a background. If you restrict yourself to lightness contrast then you are limited to ~5 shades per similarly shaped feature (eg. points or lines). Add color and you have a multitude of that. CVD affected people can see lightness differences just fine and using that is key to CVD safe design. A map that works in greyscale will work for any color vision deficiency, that's the nice thing about it. But you can design a map that works for CVD affected people and fails in greyscale. I kinda lost my train of thought mid-way through but I hope you get what I am saying. Cheers, Hannes ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
[OSM-talk] Analysis and improvement of the OpenStreetMap street color scheme for users with color vision deficiencies
Hi everyone, almost a whole year ago I asked for participation in an online survey for my bachelor thesis on the colors of street classes in the Mapnik/Standard map style for users with color vision deficiencies. First of all, thanks again to the many participants! Back then I had planned to release the results and text right after I got my grade but then it grew into a paper for the International Cartographic Conference 2013 in Dresden and I was not sure if I was allowed to share before the conference. So I didn't. Long story short: The conference is in a month and the proceedings are now online (http://www.icc2013.org/?node=29)! :-) The Paper: http://hannes.enjoys.it/pub/Johannes%20Kr%C3%B6ger,%20Jochen%20Schiewe%20%20Beate%20Weninger%20-%20Analysis%20and%20improvement%20of%20the%20OpenStreetMap%20street%20color%20scheme%20for%20users%20with%20color%20vision%20deficiencies%20(2013,%20Proceedings%20of%20the%2026th%20International%20Cartographic%20Conference,%20Dresden).pdf == http://www.icc2013.org/_contxt/_medien/_upload/_proceeding/357_proceeding.pdf My bachelor thesis (in german): http://hannes.enjoys.it/pub/Johannes%20Kr%C3%B6ger%20-%20Weiterentwicklung%20von%20OpenStreetMap-Farbschemata%20f%C3%BCr%20Nutzer%20mit%20Farbsinnst%C3%B6rungen%20(2012,%20Bachelorarbeit).pdf If you come to ICC, you can see me in a cold sweat in the Colours in Map Design Session: http://www.icc2013.org/_contxt/programme/default_session.asp?node=34day=sessionID=54 Ignore the image saying Legende by mistake, it is german for Legend or Map Key. Oopsie! ;) If anybody is genuinely interested in the raw data from the online survey, I will release it. I do not want to invest time in proper anonymisation of the data sets right now if there is no need. I am open for any kind of comments and criticism and love to discuss the topic! My own conclusion was that my colors looked too out of place in the map and thus I did not want to suggest them as changes. Maybe this is just me though, so if you think differently, please say so! In my opinion it would be much more reasonable to design a whole new dedicated accessibility style (to not only cover color vision but also take general bad sight into account). I would be interested in working on that collaboratively in case others would like to. Cheers, Hannes ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Analysis and improvement of the OpenStreetMap street color scheme for users with color vision deficiencies
On 15.07.2013 11:57, Johannes Kröger wrote: Hey Johannes Thanks for the information. Gonna read it the next days. My own conclusion was that my colors looked too out of place in the map and thus I did not want to suggest them as changes. Maybe this is just me though, so if you think differently, please say so! In my opinion it would be much more reasonable to design a whole new dedicated accessibility style (to not only cover color vision but also take general bad sight into account). I would be interested in working on that collaboratively in case others would like to. Please do not mix colour and contrast. A well designed colour map which also respects contrasts might perfectly work either with colours or in black and white. Cheers Colliar signature.asc Description: OpenPGP digital signature ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
