[Talk-GB] [OSM-talk] Rendering of Farmland not 'Light' enough?

Robert Whittaker (OSM lists) robert.whittaker+osm at gmail.com
Sun Jan 6 10:13:42 GMT 2013

On 6 January 2013 01:54, Eugene Alvin Villar <seav80 at gmail.com> wrote:
> I prefer landuse areas to be darker than the default light gray background
> color in the Standard rendering. This makes it obvious (especially on LCD
> screens where lightness/luminance of colors vary depending on the viewing
> angle) that there is a tagged area there.
> You could make the case that the farmuse area could be lighter than it is
> now and/or use a different hue than brown, but don't make it as light as the
> default background color.


In the first proposal, I find it very difficult to see the difference
between the farmland and the non-tagged areas. It's a bit easier in
the second proposal. It could maybe be made a bit lighter, but not by
that much. What's the lightness of the current landuse=residential
grey? What does it look like if you match the farmland colour to that?


>> (full text and images at
>> https://docs.google.com/open?id=0B6J5ZA1hu93bYm9IWXdlVHM1N1U )
>> Recently landuse=farmland (or simply landuse=farm) has been added to
>> fields near me. This has led to a discussion about how the rendering 'looks'
>> with some arguing that it doesn't look that good. I believe that this may be
>> due to the shade of colour used – specifically the farmland 'brown' is not
>> as luminous as the default 'grey' (actually I think it 'lightness' rather
>> than 'luminosity' that matters to the human eye but I got very confused when
>> searching the two).
>> Consider the image below, showing current rendering:
>> https://docs.google.com/open?id=0B6J5ZA1hu93bZDBTN2dZZkpDenc
>> On the left we have farmland tagged. The 'brown' has a Lightness value of
>> 83 percent (luminance of 85%). Compare this to the default canvas 'grey',
>> which has 93 percent Lightness (and 93 percent luminance).
>> Now consider the following (and please check your screen calibration at
>> http://www.photofriday.com/calibrate.php ). I have taken the farmland
>> 'brown' and raised it's Lightness to the same 93 percent as the default
>> 'grey' (that is, I have left the Hue and Saturation the same):
>> https://docs.google.com/open?id=0B6J5ZA1hu93bSzk5NDZVMm5GZkE
>> In this final image, I have adjusted the Hue and Saturation to provide
>> more of a 'green':
>> https://docs.google.com/open?id=0B6J5ZA1hu93bZXhzdVJMVU44X2M
>> What are your thoughts? Which do you prefer? Have I gone too 'light' with
>> the change and should some value in-between be used instead? Am I barking up
>> the wrong tree?

Robert Whittaker

More information about the Talk-GB mailing list