[magick-users] Background issue converting .eps to .png

[Anthony Thyssen]

zentara on  wrote...
| On Thu, 23 Oct 2008 10:25:50 +1000
| Anthony Thyssen <anthony at griffith.edu.au> wrote:
| 
| >I would really suggets you read in images before resizing them!
| >that is do the operations in order.
| >
| >As such the first line becomes...
| >
| >  convert -density 160x160  lightcurve.eps   -resize 99%  \
| >          -quality 100% -compress Lossles  lightcurve1.pdf
| >
| >However removing the -resize from the above as you were previously doing
| >maybe causing the 'delegate/coder handling' aspect of IM, see
| >   http://www.imagemagick.org/Usage/files/#delegates
| >to completely bypass the rasterization of the image.
| >
| >You may be able get the equivelent result WITHOUT resizing by using
| >-taint.
| >
| >Try this instead...
| >
| >   convert -density 160x160  lightcurve.eps -taint \
| >           -quality 100% -compress Lossles  lightcurve1.pdf
| >
| 
| Yes, taint seems to work (I don't know why :-) )
| 
| The real questions seem to be:
| 1. Why does it need an intermediate convert to pdf to get clean fonts and a white background?
| 2. Why does a direct convert to png or jpg result in a black image?
| 
| IM is very powerful but can get complicated at times. :-)
| 
Without the -taint  IM will call external programs (ghostscript) to
just directly convert EPS -> PDF, without actually reading (and
rasterizing) the image in memory.

See the IM examples delegates link above.

That means you are actually going

   EPS ->  raster  ->  PDF  -> raster  -> PNG

Which is VERY strange way of doing things.


  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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