I made a png from a pdf using ghostscript. It was converted very fast (not more than 1 sec), and has good quality.
$ identify 1.png 1.png PNG 3508x2480 3508x2480+0+0 8-bit PseudoClass 2c 51KB 0.000u 0:00.000
But for some reason I have to have a thumbnail for this kind of image.
And I don't know how to make it with
gs, so I did the thumbnail with the
convert tool from ImageMagick like this:
$ convert -thumbnail 906 1.png t.png
Resize takes about 2-4 second. Why? Why is creating the thumbnail taking taking longer than the pdf to big image conversion process? Is there any way how to fix this issue?