Convert PDF to image with high resolution

by

It appears that the following works: 

convert           \
   -verbose       \
   -density 150   \
   -trim          \
    test.pdf      \
   -quality 100   \
   -flatten       \
   -sharpen 0x1.0 \
    24-18.jpg

It results in the left image. Compare this to the result of my original command (the image on the right):

  

(To really see and appreciate the differences between the two, right-click on each and select “Open Image in New Tab…”.)

Also keep the following facts in mind:

  • The worse, blurry image on the right has a file size of 1.941.702 Bytes (1.85 MByte).
    Its resolution is 3060×3960 pixels, using 16-bit RGB color space.
  • The better, sharp image on the left has a file size of 337.879 Bytes (330 kByte).
    Its resolution is 758×996 pixels, using 8-bit Gray color space.

So, no need to resize; add the -density flag. The density value 150 is weird — trying a range of values results in a worse looking image in both directions!

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