[magick-users] Antialiased PDF rasterization

[Andy Goth]

"duc sequere aut de via decede" <duc.sequere.aut.de.via.decede at imagemagick.org> wrote:
> The solution to readable PDF to PNM conversion is supersampling as
> you suggested.  We typically use this command:
> 
>   convert -density 400 -colorspace rgb ENR_L17.pdf -resize 25% ENR_L17.ppm

Wouldn't this give me 100dpi?  I ran this command, and it works.  I can't inspect the output image just now, but I did see that it takes two hours.  Only one hour was user time, so I guess it spent the other hour swapping.  Adding RAM should fix that.

I tried -density 600 on two computers, but the gs process failed.  I didn't get diagnostics indicating exactly what went wrong.

If this is due to a memory size limit, would it be possible to do the conversion in multiple passes?  If I can get it to do the top and bottom halves as separate jobs, then I can make it run on two computers at the same time.

> In regards to speed, sometimes its as simple as having a modern
> processor with plenty of memory.

If I determine that one or more super-beefy computers are required for this operation, then I'll simply add it to the customer's cost. :^)  But if I find that the work can't be done in a reasonable amount of time, then it is a lost business opportunity.

-- 
Andy Goth | http://andy.junkdrome.org./
unununium@{aircanopy.net,openverse.com}