Re: bug in dia (windows 2000, dia Version 0.9)

[Lars Clausen <lrclause cs uiuc edu>]

On Fri, 31 Jan 2003, siemsen@ossi.fho-emden.de wrote:
> Hello,
> dia is a wonderful idea. I like it.
> 
> When working with dia unter Windows 2000, I found what seemed
> to be a bug. The problem is missing "transparency in images". I send
> you an example enclosed, consisting of
> 1. the .dia file to verify (mydia.dia)
> 2. a screendump of that .dia file (visible_in_dia.jpg)
> 3. a screendump of what that .dia file produced when exported as png
>    (after_dia_as_png.jpg)
> 
> What's wrong: if you insert an image to dia and that image is
> a text with transparent background (produced for example by the
> gimp; that image is controlled by PaintShopPro7 and is OK),
> in the dia window, the image_text is transparent (OK, look
> at 1. and the screenshot 2.). Then export that dia-source
> to a .png or .eps-image (or .jpg or ..., I tried some formats).
> Then the image_text is _not_ transparent (not OK; I checked it
[...]

Image transparency is no easy thing.  In CVS, I've managed to get it for
the PNG export, but I don't know enough PostScript to do it for eps (or for
printing, for that matter).  Any PostScript experts around, please speak up.

-Lars

-- 
Lars Clausen (http://shasta.cs.uiuc.edu/~lrclause)| Hårdgrim of Numenor
"I do not agree with a word that you say, but I   |----------------------------
will defend to the death your right to say it."   | Where are we going, and
    --Evelyn Beatrice Hall paraphrasing Voltaire  | what's with the handbasket?