How to adjust the greyscale colorbar to cover a large range?

Hi,

I think this question might have been asked previously but I have not been able to find any threads to this.

I have a bathymetry pcolor plot and I am trying to adjust the scales of the colorbar by using the colormap as the depth values ranged from -30 to 0.5. At this stage, I am trying to see more details on the -5 to 0.5 and have less detail on the -30 as most of my bathymetry are between the depths of -5 to 0.5. At this stage, all my areas that is less than -5 is in the dark scale.

Any suggestions will be great.

Thank you

Answer 1

[Walter Roberson]

Ncol = 128; fliplr(-logspace(0,log10(31.5),NCol))+1.5

This would distribute roughly the first 55 of 128 positions below -5 using a logarithmically decreasing spacing as it gets towards 5.

I would guess that you would prefer to have even fewer values below -5; in order to do that you will have to give us an idea of the sort of spacing you would consider acceptable.

For example, there are always possibilities such as:

Ndark = 20; t1 = linspace(-30,-5,Ndark+1); t2 = linspace(-5,5,128-Ndark); intensitybounds = [t1(1:end-1) t2];

which is plain linear from -30 to -5 and then plain linear with higher density from -5 to +5.