Is colormap have relation with mm?
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Can somebody explained to me what is the colormap value stand for?
![A 3D plot converted from 2D image](https://www.mathworks.com/matlabcentral/answers/uploaded_files/336226/A%203D%20plot%20converted%20from%202D%20image.jpeg)
Fig.A 3D plot converted from 2D image
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KSSV
2020년 7월 23일
The plot is obtained using surf. To plot you need (X,Y) location matrices and a matrix of values Z. The colorbar shows the distribution of your values. For example, in your plot the red color shows the value of >220. So where ever you have red color in the plot you have values > 220. Blue color corresponds to values < 20, so wherever you have blue color in the plot, your values are < 20.
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Walter Roberson
2020년 8월 18일
"But I see some paper using interferometer, codded light pattern, to measure the deflection of a metalic plate."
You do not have an interferometer image. Your image is some light projected on the underside of an object, and you have a clearer circular membrane or possibly lens in the material, and that more transparent area has a circular black rim.
The highest point in the image is somewhere related to the disk, but at the moment I cannot tell if the clearer area is slightly convex or concave. I suspect that the highest point might be the black rim itself.
You are looking through the center area towards whitish light. The orange reflects the result of the white light transmitted through the material (which is perhaps brown colored).
This is not a side view of an object. This is not light shining on a raised area. Look at how the black circle interrupts the bars: that is because the light is from the back and the black is blocking it.
The color information gives little information about height here. With constant brightness of light you could probably use the color of the orange lines to deduce something about the thickness of the material, since thicker material would block more of the light. But that would be about thickness, not about height.
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