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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Transparent fillstyle for boxes with postscript
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Date: Thu, 14 Apr 2011 08:59:34 -0700
Organization: gnuplot development team
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Michael Hofmann wrote:

> Am 13.04.2011 20:13, schrieb sfeam:
>> Michael Hofmann wrote:
>>
>>> Hi,
>>>
>>> the postscript terminal (version 4.4 patchlevel 0) does not seems to be
>>> able to create "boxes" with transparent fill style
>>
>> The PostScript language itself does not support transparency.
> 
> OK, but why *is* transparency working for "filledcurves" with
> PostScript, but *not* for "boxes"? I would expect it works for both, or
> for none.

The same PostScript commands are used for both plot styles.
Perhaps you are noticing a difference between pattern-fill and solid-fill?