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copied!<p>In general, I let MATLAB choose which renderer is most appropriate, which means leaving the <a href="https://www.mathworks.com/help/matlab/ref/figure-properties.html#property_d0e272585" rel="nofollow noreferrer"><code>RendererMode</code> property</a> of the figure set to its default value of <code>auto</code>. A brief description of the current <code>'Renderer'</code> options can be found <a href="https://www.mathworks.com/help/matlab/ref/figure-properties.html#property_d0e272286" rel="nofollow noreferrer">here</a>.</p> <p>I'll address your two problems separately:</p> <ul> <li><p><strong>A "thick red line" in the contour plot:</strong> Without seeing the code you use to make the contour plot, or a screenshot, I can't help you much with this other than to point out that you can control aspects of how the <a href="https://www.mathworks.com/help/matlab/ref/contour.html" rel="nofollow noreferrer">contour plot</a> renders by setting certain <a href="https://www.mathworks.com/help/matlab/ref/contour-properties.html" rel="nofollow noreferrer">contour plot properties</a>. For example, you can control the line width by setting the <code>LineWidth</code> property:</p> <pre><code>[C, h] = contour(peaks(20), 10); % Make a sample contour plot set(h, 'LineWidth', 3); % Make the lines thicker </code></pre></li> <li><p><strong>Figure "quality":</strong> The choice of renderer doesn't so much adjust the <em>quality</em> per se. The renderer generally influences the accuracy and speed of the graphics rendering as well as the rendering options available (i.e. lighting, transparency, etc.). If you want better <em>quality</em> images from your figures, I would suggest downloading the submission <a href="http://www.mathworks.com/matlabcentral/fileexchange/20979" rel="nofollow noreferrer">Myaa</a> by <a href="http://www.mathworks.com/matlabcentral/fileexchange/authors/31267" rel="nofollow noreferrer">Anders Brun</a> on <a href="http://www.mathworks.com/matlabcentral/fileexchange/" rel="nofollow noreferrer">The MathWorks File Exchange</a>. It allows you to create anti-aliased graphics in MATLAB. Here's a screenshot from the submission illustrating the improved figure quality:</p> <p><a href="https://i.stack.imgur.com/8umGz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8umGz.png" alt="enter image description here"></a></p></li> </ul>

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