[Newbies] Fading a PNG

Bert Freudenberg bert at freudenbergs.de
Mon Apr 23 00:29:54 UTC 2007

On Apr 23, 2007, at 0:44 , Steven Greenberg wrote:

> I have a PNG image that I'd like to display fading out.  I tried  
> the BitBlt method suggested by "Team RAR" to fade the image, but I  
> can't make it work.
> The image loads properly from a file and displays fine as an  
> ImageMorph.  I have been able to use a TransformationMorph to  
> rotate and scale it, and PNG transparency is working properly.
> Is the "Team RAR" BitBlt method the only way, or are there  
> alternatives?
> I'm running a 3.9 image, and my display depth is set to 32 bits.

Normally you would just use an alpha-blending canvas. See HaloMorph  
fadeIn/fadeOut and draw methods. To try those halos, enable this:

	Preferences enable: #haloTransitions

Now when I tried then the halo icons do not actually show until alpha  
is one. No idea why that is.

- Bert -

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