Re: png cropping

[Jonathan Kulp]

Ok I changed a couple of things to make it even more flexible.  I 
changed pnmto__ to ppmto__, giving quite a few more output options. 
I've suggested a few in the script.  Also added an option to choose 
either gif or png when choosing transparent background.  this is fun :)

Jon

script attached this time...

Patrick Horgan wrote:
> Jonathan Kulp wrote:
> > I'm guessing that one of the netpbm tools will handle transparency, 
> > it's just a matter of figuring out which one.  Didn't this come up on 
> > a recent thread?  I seem to remember trying it out on something and 
> > getting a transparent background.  When I get some time later I'll 
> > look into it.  It would be simple enough to add a prompt asking if 
> > you'd like a transparent background, I guess.
> Now that you mention it that rings a bell with me too!   I'll have to 
> search---
>
> giftoppm foobar.gif | ppmtogif -transparent '#rgb' > fooquux.gif
>
>
> works if you want gif.  First translate to ppm, then translate back to 
> gif  with the -transparent flag specifying which color, (in this case 
> #fff) will be transparent.
>
> pnmtopng has the transparent argument, but pnmtotiff and jpeg don't 
> since they don't support transparency...so, using your script, if you 
> want transparency, you have to choose png for the output, then on the 
> translation step from ppm just add the appropriate flags.  I just tried 
> it adding a quick -transparent '#ffffff' to the command line and then 
> selecting png so it would work.  It worked like a charm:)

--
Jonathan Kulp
http://www.jonathankulp.com

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