Re: [png-mng-misc] PDF to PNG conversion

[Boßlet, M. <Mar...@di...>]

Thanks, this helped a lot!

-----Original Message-----
From: png...@li... [mailto:png...@li...] On Behalf Of Glenn Randers-Pehrson
Sent: Freitag, 20. Juni 2008 12:26
To: PNG/MNG discussion list
Subject: Re: [png-mng-misc] PDF to PNG conversion

On Fri, Jun 20, 2008 at 4:37 AM, Boßlet, Martin
<Mar...@di...> wrote:
>
> Hi,
> I'm currently converting PDF files to PNG images using the standard methods provided by ImageMagick/Ghostscript. The resulting PDF files are 5 times larger on average than the respective PDF file. Using pngcrush and option -c 0 (colors are irrelevant in this special case) I'm able to cut this down to 3.5 - 4 on average.
>
> Could you suggest some tricks how I could minimize this factor as much as possible? Colors and background may be cropped, and a certain amount of loss of readability would also be fine...

First, be sure you are using a Q8 build of ImageMagick, not Q16.
Next, look into reducing the number of colors to an acceptable level,
using ImageMagick's -colors N option or using pngquant, before
running pngcrush.  You could also do the reduction to grayscale
within ImageMagick (I forget the exact incantation but it is something
like "-colorspace gray").

Glenn

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