adjust hue of landuse=residential

[nebulon42]

This tries to make the new building colour look better on landuse=residential.

• It darkens the building outline by 5% for better contrast.
• It gives residential colour the same hue as buildings and lightens it a bit.
• To compensate for that the outline is a bit stronger and is rendered already at z15.
• At z17 residential colour is lightened up a bit by 2% to have more contrast with buildings, while keeping it recognisable at lower zoom levels.

Drawbacks: residential colour is now more similar to aerodrome colour, but they were not that different before. I propose to adjust aerodrome colour if they are too similar.

http://www.openstreetmap.org/#map=15/48.0804/16.6021
before z15

(aerodrome left, residential right)

http://www.openstreetmap.org/#map=17/48.17157/16.39569
before z17

after z15

(aerodrome left, residential right)

after z17

[matthijsmelissen]

Looks fine to me, what does @pnorman think?

[pnorman]

We had decided to keep the lightness of residential, retail, commercial, industrial, and farmland the same. This would reverse that decision, which I don't think is a good idea.

[nebulon42]

I could try to extend this PR to the other landuses you mentioned, it would be good to make them lighter anyway. I'm not sure if it is possible, consistency could be also achieved by not strictly adhering to the numbers. It is good to have some symmetry in colours though.

But very practically speaking: We have here overlaying features with low contrast. How should we deal with them?

[pnorman]

would be good to make them lighter anyway.

We made them a lot lighter in #599. I'd rather not go even lighter.

But very practically speaking: We have here overlaying features with low contrast. How should we deal with them?

We should make those features stand out more, either with decreased lightness, increased chroma, or suitable outlines for linear features.

[matthijsmelissen]

Of course, making the buildings slightly darker then they are now is also not out of the question as far as I'm concerned.

[nebulon42]

I'd rather not go even lighter.

Also not for forest? There is this issue with trunk roads. Farmyard is also much too saturated. I first thought making the buildings lighter was intended to be the first step in desaturating the map (even further).

We should make those features stand out more, either with decreased lightness, increased chroma, or suitable outlines for linear features.

So let's assume the landuse colour should not change. Then I suggest that the building outlines should be 10% darker than they currently are. Also I think it's the yellowish hue of the buildings that does not go so well with the landuse colours. Here I moved the hue a bit into red and also darkened the outlines by 20% from that.

Starting from HSV(39°, .07, .84).

This is HSV(30°, .07, .84) (more red).

This is HSV(25°, .07, .84) (still more red).

with some farmland

This is HSV(20°, .07, .84) (even more red).

Old building colours for comparison.

This could work (I like the second one with 30° best). What do you think?

[mboeringa]

I am perfectly OK with even the last variant: HSV(20°, .07, .84) (even more red). It is still far from pink, but seems to give the buildings a bit more "body", without making them significantly darker.

[nebulon42]

I'm closing this as there is currently no approvement for adjusting landuse colours. I will open a new PR concerned with tweaking the building hue.