Transparent and translucent images

1
I'm having difficulty finding documentation or examples for
transparent images. Specifically, I'd like to display multiple .PNG
(or whatever) images with their alpha transparency enabled, and
additionally I'd like to make those images partially translucent.

Should I make the image translucent in Photoshop, or is there a
Psychtoolbox command to reduce opacity for a displayed image?

I'm in Windows, Matlab 7.1, and PTb 2.54

Thanks!
2
--- In psychtoolbox@yahoogroups.com, "Mathias Fleck"
<mathiasfleck@...> wrote:
>
> With the newest version, its says that I'm using OSX-specific calls
> even when i just type in 'Priority'.
> Also, it is reporting too many inputs for a command like
> Screen('CloseAll')

Are you perhaps running XP? I had the same problem when i installed
the newest stable verion under XP, about two weeks ago. Apparently it
installed an OSX version (i didn't have any dll's, but only mexmac
files).

I 'solved' it by downloading the latest beta version:
DownloadPsychtoolbox('beta')
3
Ooops! That's it!

The 'stable' branch is MacOS-X only! The Windows beta-PTB is only in
the 'beta' branch up to now. 'stable' lags behind 'beta' by multiple
months (nearly half a year now).

Didn't think of that. Probably its time soon to update stable to beta.
There haven't been (m)any bug reports for beta, so no real reason to
hold it back.

Thanks & Best,
-mario

--- In psychtoolbox@yahoogroups.com, "rnldvndnbrg" <nronaldvdberg@...>
wrote:
>
> --- In psychtoolbox@yahoogroups.com, "Mathias Fleck"
> <mathiasfleck@> wrote:
> >
> > With the newest version, its says that I'm using OSX-specific calls
> > even when i just type in 'Priority'.
> > Also, it is reporting too many inputs for a command like
> > Screen('CloseAll')
>
> Are you perhaps running XP? I had the same problem when i installed
> the newest stable verion under XP, about two weeks ago. Apparently it
> installed an OSX version (i didn't have any dll's, but only mexmac
> files).
>
> I 'solved' it by downloading the latest beta version:
> DownloadPsychtoolbox('beta')
>