[magick-users] Thumbnail filesize

[Anthony Thyssen]

Ben Marchbanks on  wrote...
| I produce fullscale and thumbnail PNG  images of PDF pages.
| 
| The fullscale images are about 100kb in size while the thumbnails are 2x that 
| filesize -  200kb and larger !.
| 
| Is there a way to produce thumbnails with the same small filesize ?
| 
two things...

First use  -strip   or  -thumbnail  during conversion to remove any and
all profiles from the final thumbnail

Second use  -compress -90  and see how well that does PNG compression
See  http://imagemagick.org/Usage/formats/#png_quality  for details

Finally use "optipng" to try to find the BEST posible compression
without data loss for thumbnails.


For even smaller PNG thumbnails but with lower image quality you can try
saving to  PNG8:image.png  instead.  Or use an external color
quantization program like "pngnq".

See http://imagemagick.org/Usage/formats/#png_non_im
for pointers to these programs.


  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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      There are bugs and there are bugs.  And then there are bugs.
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     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/