Re: Drawing of PNGs with transparent pixels

If the image is always going to come from an Imagelist, then use
ImageList.Draw() to draw the image instead of Graphics.DrawImage().

Hopefully, that'll solve your problem.

--
Mick Doherty
http://dotnetrix.co.uk/nothing.html


"Alexander Groß" <PLEASEAlexanderGrossREMOVETHIS@xxxxxx> wrote in message
news:ezAXqTveFHA.1328@xxxxxxxxxxxxxxxxxxxxxxx
> Hi everyone,
>
> I have a problem I'm currently stuck with. To enable icons in menus, I've
> written my own drawing routine for MenuItems (OwnerDraw=true). The icons
> to
> be displayed are PNGs with tranparency and are an embedded resource. On
> startup I load the images into an ImageList as described in [1].
>
> So far everything works fine. If I assign one of my icons to a TabPage it
> is
> displayed correctly including transparent regions without artifacts on
> edges. The same is true for ToolBarButtons with an appropriate ImageIndex
> set.
>
> For MenuItems I use the method Graphics.DrawImage() to draw the icon. But
> here, the disturbing artifacts appear again! The same happens if I assign
> an
> image to a PictureBox control.
>
> What seems unlogical to me is that other controls like ToolBarButton draw
> the icon correctly. I've set
> Graphics.CompositingMode=CompositingMode.SourceOver to ensure that
> half-transparent pixels are merged with the background color, but to no
> avail.
>
> Does anybody know a way how to get around that?
>
> Thank you very much, best regards,
>
> Alex
>
> [1] http://www.codeproject.com/cs/miscctrl/AlphaImageImagelist.asp
> --
> _______________________________________
>
> Alexander Groß
> Dipl.-Ing. (BA) für Informationstechnik
> PLEASEAlexanderGrossREMOVETHIS@xxxxxx
> http://www.it99.org/axl
> ICQ# 36765668
> _______________________________________
>
>


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