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How do I tune a color scale to a matrix image?

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Shang Gao
Shang Gao 2018-9-18
评论： jonas 2018-9-23
Hi, I have a problem with my other programming tool and have to use MatLab to draw a 2D map with the specific color scale. The function is basically like mat2gray(), only difference is that instead of the gray color scale, I need it to be like the color scale in the image attached.

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jonas
jonas 2018-9-18
编辑：jonas 2018-9-18
You can easily draw your matrix with a specific colormap. You don't need to convert it to an image beforehand.
A=peaks;
imagesc(A);
colormap(bone);
If you then want the image data, you can just type
I = getframe;
and then you can treat is as an image
imshow(I.cdata)
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jonas
jonas 2018-9-22
编辑：jonas 2018-9-22
It was just an example. Just stack the colors of a single column of your colorscale and use it as colormap. If I is the RGB matrix of your colorbar, then I(:,1,:) contains the RGB triplets of your colormap. Just reshape it from nx1x3 to a nx3 matrix.
Can give you code in a bit if you dont figure it out. On mobile atm.
jonas
jonas 2018-9-23
Here you go
A=peaks;
imagesc(A);
I=imread('image.png')
cmap=im2double([I(:,1,1) I(:,1,2) I(:,1,3)])
colormap(cmap);

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