I am using a 1280x720 black and white image of a triangular-type shape which
I would l like to mask images generated in quartz. The triangular shape is
100% white and the black 0% and at this stage i'm not using a gradient
for simplicity. The shape is to make a kind of movie projector lightbeam
throw effect. When I attach the image to the billboard Mask input, I don't
get a clean edge – the black areas in the mask images show up just not as
brightly as the white masked areas. I'm looking for a sharp clipping mask
edge. I tried to workaround with various composite patches (Darken and
Multiply seemed worth a spin) prior to the billboard (and illiminating the
need for mask) which only has confused me more and raised more questions in
regards to matching image dimension (Resize and Crop patches). Because of
other elements on the screen I'm looking to use Over blending mode.
There must be a straight forward way to apply an alpha to an image to get a
clipping mask but i'm from the the land of Adobe products etc, not Computer
Science, so I'm stumped in QC again
((I like basic mathematics and programming though and I want to get up this
Quartz learning curve, the potential to quickly demo motion graphics seems
great if I could become efficient and effective!))
Also on those other question: When hovering the cursor over a patches' image
output port (not so easy with a tablet BTW Apple) an image preview is
generated along with dimensions expressed as {a,b,c,d}. c and d seem to be
the image dimensions but as for a and b they are often negative so are they
the locating co-ordinates?? If they are, how to get a image matching the
same location and size as another is beating me also.
Really appreciate any help – QC seems to be my addiction as I keep try to do
things in it I should just go to AE or Motion for probably, as far as
time-cost goes.
If it helps I'll snip this part of the comp and post as .qtz. Only reason I
haven't is because of a couple of large image files it uses.
Alastair Leith
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