Graham,
PNGs support transparency as well as not. They are IMO the best for
lossless compression. GIFs are good for animation.
I use PNGs all of the time. I use Photoshop (not elements) and when I
save a png I delete my background and make sure the BG is transparent
(with little checker boxes in PS) But If I 'flatten' the image it
takes away the transparency and instead if I flatten visible layers
(Do not include the BG) then delete the BG it always works perfectly.
That is the way I do it. I am not sure about GC since I don't use
that anymore.
This is not a limitation but rather a feature of PNGs that you can do
both. Rev respects which ever way you saved the file.
Tom
On Nov 29, 2005, at 5:05 PM, graham samuel wrote:
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).
Can anyone clarify this for me?
TIA
Graham
----------------------------------------
Graham Samuel / The Living Fossil Co. / UK and France
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