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How to change the thickness of lines in imagesc plot?

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Namira
Namira 2018-7-3
编辑： Namira 2018-7-5
I plotted this figure using command
imagesc(fd,f,log10(P));
I am able to change the colors of the figure, but I can't control the thickness of the line in Figure. I would like to draw the same figure with thicker and black colored line.
How could I proceed? Thanks.

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Image Analyst
Image Analyst 2018-7-4
I don't know where the lines came from but if they are burned into the image, you can widen dark things by using imerode() which is a local minimum:
se = strel('disk', 4, 0);
fd = imerode(fd, se);

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