Removing grid/edge lines in pcolor() figure

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John Petersen 2012-4-30

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https://ww2.mathworks.cn/matlabcentral/answers/37049-removing-grid-edge-lines-in-pcolor-figure

编辑： NUR AMIRA ZULKIFLLI 2020-5-26

I have a figure drawn using pcolor(). A lot of small grid lines are drawn that effectively darken the figure so that you can't see the colors well. I can remove the lines by selecting the graphic and then open the property editor and change "Edges" (shown with a drop down menu) to "no line". Is there a command I can code into my script that will do this?

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NUR AMIRA ZULKIFLLI 2020-5-2

编辑：NUR AMIRA ZULKIFLLI 2020-5-26

set(h, 'edgecolor','none') or surf(SMImage{SMImageNumber},'edgecolor','none'); fix my problem

Image Analyst 2020-5-2

在 MATLAB Online 中打开

Well you could edit the function to change varargin to tack on the 'EdgeColor', 'none' to it.

>> edit pcolor.m

But it's not recommended to alter built-in functions.

Again, pcolor does not show the last row and column. From the comments in the function "PCOLOR(C) is a pseudocolor or "checkerboard" plot of matrix C. ... the last row and column of C are not used." Here it is displaying a 4-by-4 matrix:

>> pcolor(randi(9, 4, 4))

Note: it's not 4-by-4.

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Answer 1

Jan 2012-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/37049-removing-grid-edge-lines-in-pcolor-figure#answer_46306

在 MATLAB Online 中打开

h = pcolor(X,Y,C);
set(h, 'EdgeColor', 'none');

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Jan 2017-2-22

This is a problem of the PDF export.

Kerry 2018-3-17

check out vecrast . It fixes the white line problem in PDF and eps plots of surfaces. It's also an efficient way to save the figure while still retaining the ability to use Illustrator (or other vector graphics tool) to edit the annotations and non-surface objects.

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Answer 2

Image Analyst 2012-4-30

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https://ww2.mathworks.cn/matlabcentral/answers/37049-removing-grid-edge-lines-in-pcolor-figure#answer_46302

Tell me why you're using pcolor() instead of image(), imagesc(), or imshow(), none of which have dark lines between the pixels and all of which have a color or intensity related to one pixel's value (unlike pcolor). pcolor can show a color related to the pixel value if you use flat shading but otherwise "each cell is colored by bilinear interpolation of the colors at its four vertices, using all elements of C" - is that what you want? Plus you don't get a little colored square for each pixel even if you did use flat shading - the last row and column are missing - is that what you want? I'm sure that there is someone out there who wants the "pixel" color to depend on how tilted the tile is when tying its corners to the four corners where the pixels are, rather than depend on the color of the individual pixels, but I haven't seen anyone say so yet - they've all dumped pcolor for a regular image display function.