MATLAB: Does the line plot in MATLAB show a color gradient of black, green, and red

colorgradientMATLABopenglplot

As seen in the attached image, I am trying to create a line plot with a particular color but it is displayed with a color gradient, predominantly of black, green, and red. This happens even if the default Color property is overridden. How can this be fixed?

Best Answer

This behavior is a known issue with certain Intel drivers. It has been addressed in the recent 4380 driver. There are two workarounds:

1) Use the OpenGL hardware basic mode

opengl hardwarebasic

2) Disable the align vertex centers property of the line

h=line(1:10);
h.AlignVertexCenters='off';

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It looks like whoever wrote this is not familiar with the vectorized methods in MATLAB - this code is very inefficient. But anyway, all you have to do is to get rid of the "if" test for three distinct cases, and just change the numbers to whatever they are for whatever color you want.

if (InputImg(i,j,1)>=0.6) & (InputImg(i,j,2)>=0.6) & (InputImg(i,j,3)<=0.3) % Change these #'s

If you want to see a better, more flexible method, see the "Color segmentation by delta E color difference" in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

Best Answer

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