Transparency and PNG format

[Eric Chatonet]

Hi Graham,

I use a lot of PNG in my apps, plugins and stacks.
When a *correct* PNG is imported, transparency is always there  
without any problem (I use Photoshop :-)
Then if you don't get the transparency, it does not seem to be a Rev  
problem.
A trick in addition : if you want to have very lights images, first  
you make a PNG, you install it into your stack at the right place and  
then take a screenshot, crop it into any image processor and save it  
as a compressed JPEG you will place exactly on your (JPEG too)  
background :-)
The best way to minimise *static* images in any project.

Best Regards from Paris,

Eric Chatonet.

Le 29 nov. 05 à 23:05, graham samuel a écrit :

> Folks, I've got a number of small GIFs in an app, representing  
> human figures - therefore not rectangular. I managed to give each  
> one a transparent background and RR honours this when I import the  
> GIFs as images (i.e. the background information on the card shows  
> up around the shape of the figure).
>
> I've now started to using PNGs rather than GIFS, and I can give  
> them transparent backgrounds in exactly the same way as the GIFs  
> (GraphicConverter on the Mac is really good for this - a lot  
> simpler than Photoshop Elements... but I digress). However when I  
> import a PNG as an image, the transparency disappears and the  
> figure therefore appears in a white rectangle. I can fix this with  
> inks, but only on the Mac, and this app is destined for PC users  
> mostly.
>
> I've looked at the docs, but I can't see a way of telling RR to use  
> the transparency in a PNG. I see a bit about Alpha Channels, but I  
> don't know if I'm using an Alpha Channel or not, and anyway I can't  
> understand how RR deals with them. I can of course convert all my  
> PNGs to GIFs, but is this the only solution? (This leads me to ask  
> if is there any disadvantage to using GIFs over PNGs - I kind of  
> thought there was, but I'm no longer sure why).

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