[Mac OS X TeX] small dots disappear in Quartz

[Ross Moore]

Hi Troy,

> 
> Now, each dot, as an individual becomes invisible at a small scale, 
> but a large number of dots clustered together are quite visible at 
> almost all scales.
> 
> I think this is a bug.  A big blue blob should scale.  Reduce the 
> scale and you should get a small blue blob; it should not disappear.

Interesting problem.
If each dot is considered separately, then the renderer is doing the
right thing. It is only when taken together that there is a problem.

So each dot needs to affect its surrounding pixels, not just
those which it occupies. Isn't that what anti-aliasing is all about?

Are the dots clean squares of pixels, or are they anti-aliased?
If the former, then try using Ghostscript to render the image,
with anti-aliasing on for graphics primitives (not just for fonts)
 --- there is a setting   GRAPH_ALPHA_BITS ,  I think.
When you've got that working, use Ghostscript to write the image as
PDF (e.g. with a modification to the epstopdf Perl script) and try
viewing this in Acrobat.


Best of luck.

	Ross

 
> <http://bugreport.apple.com> isn't working right now, but I plan on 
> submitting this one.  At the same time, I thought the list might be 
> interested.
> 
> Troy.
> 
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