From: Tim Hunter <rmagick@...>
Date: 2008-03-25T22:27:09+09:00
Subject: Re: RMagick convert EPS to PNG => poor quality

RHjorth wrote:
> Hi all,
> 
> After some initial troubles having RMagick (and ImageMagick) working
> on windows, it finally works and quite well I might add.
> 
> However when convertin a EPS (yes, a barcode) to PNG (and rotating it)
> the quality are unusable poor - the code for doing it are faily
> simple:
> 
> psc = Magick::ImageList.new(ps_name)
> psc.density = "300x300"
> psc = psc.rotate(270)
> psc.write(im_name)
> 
> I think the density are ignored.
> 
> What else am I doing wrong?
> 
> Please help me out here :)

This is a tricky conversion that typically generates a lot of questions 
in the ImageMagick forum. The problem is that the Ghostscript fonts 
aren't designed for low-resolution devices like monitors.

Try specifying the density when reading the image, like this:

psc = Magick::Image.read(ps_name) { self.density = "300x300" }.first

If that doesn't help, open a Support Request on the RMagick project on 
RubyForge and attach a copy of your EPS file. I'll be glad to take a 
look and consult with the IM developers if necessary.


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