[magick-users] Again: Preserving alpha cannel in PNGs

[Anthony Thyssen]

Claus Cyrny on  wrote...
| Hi,
| 
| since I didn't get any response to my initial post, I'll give it
| another try! ;-)
| 
| My problem: I would like to convert SVG graphics I created
| in Inkscape 0.45-1 into PNGs (16-bit color depth). This /basic-
| ally/ works, but there's no alpha channel in the PNGs. My
| actual goal is, to make a composite of two images in 16-bit:
| one being an SVG, the other a 16-bit bitmap (PNG or TIFF)
| edited in CinePaint. Since Inkscape itself only exports PNGs
| in 8-bit, I thought about using ImageMagick, but where the
| alpha channel is supposed to be, there's actually white (#ffffff)
| --presumably the default background color. How do I get rid of
| this?
| 
-background None    or    -background transparent

Also make sure you set -depth 16 after reading the image or
IM may try to preserve the depth of the background you composed the SVG
onto.
  IM Examples, Basics, Quality and Depth
   http://www.imagemagick.org/Usage/basics/#depth

I just added some updated to this section whcih should appear tomorrow
(Saturday).

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