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List:       imagemagick-user
Subject:    Re: [magick-users] Rendering text -> unreadable in GIF or XPM
From:       Anthony Thyssen <anthony () griffith ! edu ! au>
Date:       2006-05-22 7:00:20
Message-ID: 200605220700.k4M70KSp015005 () wumpus ! itc ! gu ! edu ! au
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David Reitter on  wrote...
| On 22 May 2006, at 01:12, Anthony Thyssen wrote:
| 
| > I suggest you switch to a 'terminal' font designed to be drawn as a
| > bitmap.  Helvetica  is NOT such a font.
| 
| I can try this, but unfortunately, it is not one of my options in  
| terms of the requirements of this job. The font will need to be the  
| system font that is usually used under icons. This looks the same in  
| all applications, and as far as I know, it's a vector font which  
| looks great at that point size.
| 
In that case add a background. or use PNG.

System fonts are handled by being drawn onto the background.

Or add a background color that is very close, and make anything still
that background color transparent.  This is the technique described in
the IM Examples, Common Formats, GIF, Background Transparency.


| > Also use the 'threhold' control I explained in my previous email  
| > and in
| > IM Examples, formats, GIF  to remove any 'IM version threshold'  
| > problem
| > you may have.
| 
| OK, thanks for that pointer. The threshold parameter as per your e- 
| mail made it look ugly.
| 
Any GIF wiuth transparency will look horrible, unless the image is given
a color 'halo' like effect that matches the existing background.  It is
about the only way to do near-anti-aliasing with a GIF boolean
transparency.


| I think I solved the problem in the way I described in my e-mail:  
| assume a fixed background color, use `composite' to render background  
| and image with alpha channel, then convert to GIF using the  
| background color to define the transparency mask. The non-1000%  
| background pixels will then be locked to the assumed color, the  
| surrounding regions will be transparent. That way, it'll still look  
| good on slightly different backgrounds.
| 
There you go!

  Anthony Thyssen ( System Programmer )    <A.Thyssen@griffith.edu.au>
 -----------------------------------------------------------------------------
           Beware the kite eating trees!  -- Charlie Brown
 -----------------------------------------------------------------------------
     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/
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