Revolution Hypercard cellophane color
J. Landman Gay
jacque at hyperactivesw.com
Sun Jan 30 10:32:29 CST 2005
On 1/29/05 3:58 PM, Cubist at aol.com wrote:
> sez FMoyer at aol.com:
>>...when I set the ink
>>of the graphic to blend, the colors underneath blend with the color of the
>>That's not what happens in Hypercard. In Hypercard, the color of the top
>>object trumps everything underneath unless what is underneath is black.
>>Any other color is completely obliterated. There is no blending. So blue
> over a white
>>background remains blue. With "blend" in Revolution, I believe blue over
>>a white background becomes light blue.
>>Perhaps there is something that I don't understand about blend.
> The thing you're missing may well be a property called "blendLevel", which
> basically defines how opaque the top graphic is.
Fred and I talked about this in email a while back. I don't think
Revolution can do what he wants. The reason is that AddColor was an
add-on, an overlay of which HC itself was completely unaware. AddColor
has special color effects that no other graphics program allows --
specifially, it allows various blends or opacity to operate with its own
graphics, but it *always* allowed black pixels on the card layer to show
through no matter what graphics effect it used for itself.
Thus, when using two "opaque" addColor objects, the top object would
cover the lower one and there would be no color blending between the
two. However, when laid over the card, all of HyperCard's text or native
paint images *do* show through. It was possible to have an opaque
addColor object overlapping both another addColor object as well as a
field, for example, and the opaque object would cover the other addColor
object while still allowing the field text to show through.
When color is implemented natively, as it is in Revolution, the
blendlevel or opacity applies to the entire card with no exceptions.
There is no way to make color objects opaque to each other but not
opaque to black text or graphics. And that's what Fred wants to do.
Jacqueline Landman Gay | jacque at hyperactivesw.com
HyperActive Software | http://www.hyperactivesw.com
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