===== Image Magick =====

==== img to pdf ====
<code>
convert img.jpg img2.jpg book.pdf
</code>

==== memory issues ====
Error:
<code>
convert-im6.q16: cache resources exhausted `20200731_110704.jpg' @ error/cache.c/OpenPixelCache/4080.
convert-im6.q16: cache resources exhausted `20200731_110758.jpg' @ error/cache.c/OpenPixelCache/4080.
convert-im6.q16: cache resources exhausted `20200731_110806.jpg' @ error/cache.c/OpenPixelCache/4080.
convert-im6.q16: cache resources exhausted `20200731_110815.jpg' @ error/cache.c/OpenPixelCache/4080.
convert-im6.q16: cache resources exhausted `20200731_110822.jpg' @ error/cache.c/OpenPixelCache/4080.
convert-im6.q16: cache resources exhausted `20200731_110832.jpg' @ error/cache.c/OpenPixelCache/4080.
convert-im6.q16: cache resources exhausted `20200731_110839.jpg' @ error/cache.c/OpenPixelCache/4080.
</code>
Increase memory /etc/ImageMagick-6/policy.xml