[NTG-context] Adobe Reader, PNG transparency and colors

Hans Hagen pragma at wxs.nl
Thu Feb 21 10:44:15 CET 2008


Michal Kvasnička wrote:
> Many thanks for your answer.
> 
>>> If I include some transparent stuff on a light background (i.e. a
>>>> metapost figure on a light gray screen), there's a visible rectangle
>> around it (on
>>>> the screen).
> Yes, it's unfortunately normal at least in Acrobat 7 and 8, also in
>> Apple's PDF viewer (in Preview, Mail etc.).
>> In my experience esp. transparent (or flattened) elements show a fine
>> white border - but if you zoom in, it stays the same fine line or
>> sometimes disappeares. And it never shows in print.
>>
> 
> 
> However, what I meant was slightly different: not a tiny white line around
> but a solid (full) rectangle with light gray background. You can see it
> here: http://www.econ.muni.cz/~qasar/tmp/inst-slide02.pdf, page 3 (the ugly
> background in the figure on the page 2 is my fault).

isn't that alpha channel stuff? i never looked into that but your marx 
picture does not have the gray background .. maybe compare the internals 
of these graphics adn see what happens inside


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