edgecolor of pixels of imagesc
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Image Analyst on 25 May 2020
Edited: Image Analyst on 25 May 2020
You can't. And if you use pcolor, you don't either. The tiles you see in pcolor are NOT pixels. Look closely. If you want to show a 4x4 array with pcolor, do you see a 4x4 array of pixels?
m = magic(4)
No, you don't. Those black lines goes through the MIDDLE of the pixels, they don't surround them. And to make it worse, you see a 3x3 array of tiles, not a 4x4 array. Very deceiving so that's why I never use pcolor().
Aaron T. Becker's Robot Swarm Lab on 25 Jan 2021
Consider using the code Pixel Grid, https://www.mathworks.com/matlabcentral/fileexchange/71622-pixel-grid
The function pixelgrid superimposes a grid of pixel edges on an image. The purpose is to easily visualize pixel extents when zooming in closely on an image. The grid is drawing using lines with contrasting colors so that it is visible regardless of the colors of the underlying pixels.
Steve Eddins (2021). Pixel Grid (https://github.com/mathworks/pixelgrid), GitHub. Retrieved January 25, 2021.
Rongxing Hu on 24 May 2022
You could use plot to add the edge lines
edge_x = repmat( [0:length(xdata)]+0.5, length(ydata)+1,1)
edge_y = transpose( repmat( [0:length(ydata)]+0.5, length(xdata)+1,1) )
plot(edge_x ,edge_y, ' k') % vertical lines
plot( transpose(deg_x), transpose(edge_y ), 'k') % horizontal lines