# Colour Gradient - Above and below 1?

Hi All,

Been looking at mapping population change too some shape boundaries. But am having a problem colouring the shapes to show both increase and decrease in population… im sure there is a simple solution and that I am missunderstanding something…

I would like shapes that have little change in population (ie percentage change is close to 100%) to appear white

So that values:

<1 More blue
1 = White

1 More red

Obviously the gradient plug doesn’t recognise a ‘center’ (aka 1 value) as does not appear 50% though the list…

Do i need to spit the list so that values below 1 are mapped to a different gradient to values that are above 1?
seems like an annoying work around and im sure someones done this before.

Any help would be appreciated.

Thanks,

B

You need to re-parameterize your numbers to a range between 0 and 1.

Have ended up doing this… Not that complicated in the end.

would be interested to see if anyone else has any thoughts on this.

Continuing the discussion from How to ask effective questions:

If you click on the point in the gradient input, you will recognize it has two colors. One to the left and one to the right. For example if you have a point on the right side (I assume it’s 1 in your script) you can set color to the left which get <1 and one to the right >1. if I understand you correctly this should help.

Create one point on the left, one on the right. 1. left color = blue, 1. right = white
2. left = white, 2. right = red
=> points < 0 will be blue, 0-1 = white, >1 = red.

Hope I could describe it as close as possible.