[horde] Re: [dev] PNG alpha transparency with IE

Daniel Eckl daniel.eckl at gmx.de
Fri Dec 5 10:11:59 PST 2003

Simply stated:


Extended answer:

Look at the patched menu.inc and try it, if you don't believe. I don't make
patches if I don't have the need for a solution and know that the patch is
working... Well, the patch is ugly and cannot be commited, but it's working and
it's a starting point.

Or use google and search for: Explorer png alpha...


Zitat von Etienne Goyer <etienne.goyer at linuxquebec.com>:

> On Fri, Dec 05, 2003 at 01:37:26PM +0100, Daniel Eckl wrote:
> > I love the possibility of those themes in horde, but they got me into a
> problem.
> > I need a logo in the upper left, and it needs transparency. But since the
> > background color can change through the themes, I need alpha transparency
> using
> > png.
> >
> > But as many of you know, IE 5.5+ is only able to view this alpha with a
> rather
> > dirty css parameter.
> IE does not indeed support PNG alpha channel, but it *DOES* support
> indexed PNG with transparency (aka PNG8 by some).  This is equivalent to
> GIF with regard to transparency.
> In The Gimp, open your PNG, Right click -> Image -> Mode -> Indexed.
> You can then make some color transparent, and it will be interpreted
> correctly by any version of IE I know of.
> --
> Etienne Goyer                    Linux Québec Technologies Inc.
> http://www.LinuxQuebec.com       etienne.goyer at linuxquebec.com
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