RE: FLASH: A bitmap wipe transition

[David Owen]

Fletch-

Try this. If you are working in Flash 3 then you can take advantage of alph

channel transparencies in bitmaps. These are brought in with PNG files (dual

platform) or PICT files on a Mac.  


Create a tall vertical file in an image editor of an appropriate solid color

for your wipe. Give this file an alpha channel fade off to one side or

another, depending on which way your wipe moves. (if you get this wrong,

don't worry, you can flip it later in Flash). 


Now import this bitmap into flash and you will see that there is tranparency

along the edge corresponding to the alpha channel.   Next create a symbol of

a solid rectangle of the same color as your bitmap, this should be big

enough to perform your wipe. Place this rectangle on a layer just under the

layer containing the PNG bitmap with the transparent edge. Line up the  PNG

with the edge of the rectangle so the transparent edge is facing out.  Now

you can animate these 2 elements together to perform your wipe.


The reason you do not do this with one large PNG is file size. Just use

enough of a bitmap to create your edge then use a vector to occupy the bulk

of the wipe.


* Owen *


> ----------

> From: 	Ash Patrick-CPA016

>

Reply To: flashershocker [dot] com

> Sent: 	Wednesday, August 26, 1998 1:26 PM

>

To: 'flashershocker [dot] com'

> Subject: 	FLASH: A bitmap wipe transition

> 

> 

> I have a problem and whoever can help that would be great. I am still

> kinda new at Flash and I am trying to perform a graphics wipe.

> I want to have a main Bitmap in the background and then have it

> gradually wipe away from one side to the other, but I wanted to try and

> get the edge of the wipe to be kinda like a fuzzy haze rather than a

> sharp line.  I tried to use a mask layer w\ a gradient as the mask but

> the edge was still sharp.  Any help would be great.  And I am sorry if

> this was discussed before and I missed it.

> 

> Thanks in Advance,  Fletch

> 

> 


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