This tools is useful to extract circuit diagrams from PDF documents.

First permission must be added to the policy file to allow this.

Edit /etc/ImageMagick-6/policy.xml and add the following

<policy domain="coder" rights="read | write" pattern="PDF" />

After, each page of a PDF can be converted to JPEG where it can be further cropped or reduced in quality.

convert -density 600 INPUT.pdf -quality 100 OUTPUT.jpg