How to make colormaps like the attached colorbar?
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hello community,
I am quite new to colorbar interpolation techniques. Therefore, I would really appreciate your help in this regards.
I want to make a colormaps like the attached colorbar.
thanks in advance.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/807204/image.png)
2 件のコメント
DGM
2021 年 11 月 20 日
In what aspects?
Do you want it to be borderless?
Do you want it to be shaped the same?
Do you just want the same colors?
採用された回答
DGM
2021 年 11 月 20 日
編集済み: DGM
2021 年 11 月 20 日
If you just want the colormap used in that image, this is it.
A = imread('colorbarimage.png');
np = 37; % number of points
x0 = 75; % centerline of bar
y0 = 181; % location of first breakpoint
yf = 767; % location of last breakpoint
dy = (yf-y0)/(np-2);
x = x0*ones(1,np);
y = y0-dy/2:dy:y0-dy+np*dy;
imshow(A); hold on; % show image
plot(x,y,'kx','linewidth',2) % and sample locations
% extract a colortable from the image
ct = im2double(squeeze(A(round(y),x0,:)))
If you want the colortable to be longer, then you can interpolate.
ctlong = interp1(1:np,ct,linspace(1,np,256))
その他の回答 (1 件)
KSSV
2021 年 11 月 20 日
編集済み: KSSV
2021 年 11 月 20 日
Pick the RGB values of maximum value color you want and pick the RGB values of minimum value color you want to represent.
Let the values be:
r0 = rand ;g0 = rand ; b0 = rand ;
r1 = rand ;g1 = rand ; b1 = rand ;
M1 = [r1 g1 b1] ; % RGB valaues of color which represents maximum value
M0 = [r0 g0 b0] ; % RGB valaues of color which represents minimum value
N = 12 ; % say you want to have 64 colors/ variations between maximum and minimum
cmap = [linspace(r1,r0,N)' linspace(g1,g0,N)' linspace(b1,b0,N)'] ;
Z = peaks(100) ;
pcolor(Z)
colormap(cmap)
shading interp
colorbar
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