Lines appearing on svg images from export_fig

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Kristoffer Clasén 2021-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/1574898-lines-appearing-on-svg-images-from-export_fig

评论： Kristoffer Clasén 2021-10-31

shittyImage.PNG

HI,

I'm using export_fig to export svg imgas that goes into ms word. However, a grid of non-colored lines appears on the images which becomes very apparent on surface plots and it looks like garbage. Particularly frustrating when there is an intended grid as well. The grid changes with the resolution. Is there a was to get rid of this?

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DGM 2021-10-30

编辑：DGM 2021-10-30

在 MATLAB Online 中打开

IIRC, it just checks to see if the third-party tools are available and uses them automatically.

From export_fig() docs:

% SVG output uses Matlab's built-in SVG export if available, or otherwise the
% fig2svg (https://github.com/kupiqu/fig2svg) or plot2svg 
% (https://github.com/jschwizer99/plot2svg) utilities, if available.

Whether it dumps a message might depend on what version of export_fig() you downloaded. Yair has been updating it rairly regularly.

Export_fig() uses 'painters' renderer for vector output, but I don't know if an explicit specification of a different renderer would change anything.

EDIT:

I just found this:

Lines in patch objects - when exporting patch objects to PDF using the painters renderer (default), sometimes the output can appear to have lines across the middle of rectangular patches; these lines are the colour of the background, as if there is a crack in the patch, allowing you to see through. This appears to be due to bugs in MATLAB's internal vector rendering code. These lines can often be removed from the PDF using software such as InkScape. Sometimes disabling anti-aliasing in the PDF-reader software can get rid of the lines (discussion).

Kristoffer Clasén 2021-10-30

编辑：Kristoffer Clasén 2021-10-31

Yes, tried exportgraphics (of which .eps is the only viable vector outcome), similar result as export_fig, messed up grid, but also undesirable cropping of the image.

It seems export_fig alters linewidths and markersizes when exporting to eps, because the appearance change a lot compared to svg of tif. Axes, markers, all changes. Perhaps because the format doesn't allow certain linewidth?

Edit: So I assume that the grid issue I keep having with eps is that transparency is not supported, and therefore it is rendered as dashes instead. Seems that the linewidths issue can be sorted by simply adjust it a bit, 0.5->0.4 gives similar result visually as when saving as svg/ tif.

Kristoffer Clasén 2021-10-31

Gave up on the idea of saving directly to svg. Went for eps instead, which renders ok after some tweaking on linewidths here and there, converting the eps to svg using cloudconvert which works really well and maintains the quality. Had to give up on the grid, the grid doesnt work with contourf and eps, it becomes plotted on top of the surface as dashed lines when exporting to eps. All other plots, lines, bars etc, works with grid however.