Jet function output error

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WizKing
WizKing 2018-7-29
I got a script that is to create a flux map using two images; image of reflected rays and image of the sun. The inital lines make sense and produce an output but the total result is null (the is no flux map) after running it. I realized the
jet (ceil (max(fmap_img(:)))
did not produce anything. Any help?
  4 个评论
Walter Roberson
Walter Roberson 2018-7-29
You can attach the script.
WizKing
WizKing 2018-7-30
@Walter Robertson. Okay

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回答(1 个)

Image Analyst
Image Analyst 2018-7-30
编辑:Image Analyst 2018-7-30
You must pass Jet an integer that is the number of colors it is supposed to create.
Try this:
numberOfColors = ceil (max(fmap_img(:))) % No semicolon
cmap = jet(numberOfColors) % Create a color map.
colormap(cmap); % Apply the colormap to the indexed/gray scale image.
What do you see in the command window? Does the image look pseudocolored now?
You might also want to look into caxis().
  6 个评论
WizKing
WizKing 2018-8-3
编辑:Walter Roberson 2018-8-4
Okay please I have done that.
Also, after the colormap() call. I want to create a surface that looks like:
[X,Y] = meshgrid(-8:.5:8);
R = sqrt(X.^2 + Y.^2) + eps;
Z = sin(R)./R;
% surface in 3D
figure;
surf(Z,'EdgeColor','None'); view(2)% surface in 2D
Using the colormap() output in the script. So that the red will be the centre color (peak), followed by yellow up to blue in a concentric circular transition.
Walter Roberson
Walter Roberson 2018-8-4
colormap(jet)
after the above code would produce that effect.

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