Check the sprite "Blending" mode. You need "Blend: Over" for alpha
to change the transparency of your sprite.
Hope that works for you,
- Aaron.
On 25-Aug-05, at 9:33 PM, Tom Bernard wrote:
I understood the alpha component of a color to express the
visibility of the
color. An alpha of 1.0 will render the color opaquely, an alpha of
0.0 will
make the color invisible and an alpha of 0.5 will render the color
with the
background visible through the color.
So why does Quartz Composer sometimes follow the above and at other
times
render an alpha of 0.0 as black.
In this quick sample, I started with a Clear patch set to clear the
patch to
a light gray with an alpha of 1.0. Then I added a Sprite. To the
sprite, I
connected a Color Transformation. I set the initial color of the Color
Transformation to a light blue with an alpha of 1.0. Then I
connected two
Interpolation patches to the Color Transformation; the first
Interpolation
ranges from 0.0 to 360.0 and drives the Hue Rotation. The second
Interpolation ranges from 0.0 to 1.0 and drives the Alpha Factor. I
was
expecting the Sprite to gradually fade in from totally invisible to
the
color of the moment. Instead, the Sprite goes from black to the
color of the
moment.
Thanks in advance.
Tom Bernard
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