Plotting of Graph using the Color Value

From the MATLab, I'm able to obtained values based on the color field, e.g. red, yellow,green..etc

However, I need to convert the color code value to graph based on the image shown from A to B.

How do I plot the graph based on the color code (delta vs distance from A to B in pixel or mm)?

Thanks a lot!

Answer 1

[Image Analyst]

It's best if you can just export your image not as a pseudocolor image but as the original grayscale image. That should be possible. If it's not, like you lifted this image off the web or somewhere, then you'll need to convert the colorbar into a colormap. You need to get the center column of the colorbar

theColorBar = rgbImage(100:300, 700, :); % Or whatever numbers locate the colorbar.

and for each color, interpolate its gray value, which will be between 0 and 0.4. Then call rgb2ind() to recover the missing grayscale information.