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Bad Alpha Bad! ( posted on apples site as well)
Ok boys and girls,
have any of you came across this problem.
The alpha channel is smaller than the effect.!!!!
When I put a glow or light rays on a text object the alpha channel is not as large as the effect
go look atI’m using motion2 the layer is set to either combine or normal (doesn’t matter)
why did apple decide to arbitrarily make the alpha smaller??????
huh???
There they go thinking different again!!!!!!
and I love Apple and macs but this is really the last straw for Motion first the stupid way the handle fade in and out with the drop shadow coming through the white text( yeah I know i have to animate the levels filter on the alpha channel)
this is for a film out and the lab needs to have the alpha for overlay Arrrrgh!!!
thanks for your help this is the program I hate to love
mdr -
4 Replies
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If you hover the mouse cursor over the middle of the I and N, the alpha channel values read out at around 90 and this tallies with the image when viewing just Alpha. The problem seems to be the Brightness filter, because it’s flaring out the RGB channels but not affecting the alpha at all. So use the Levels filter instead, twirl down to reveal the sliders and set Alpha>White In to 0.2. Seems to do the trick here.
Martin
Digital Heaven, London UK
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NEW! VideoSpace – free diskspace calculator widget -
Here’s what I’m doing:
1) create motion file
2) add text and effect (directional blur and brightness)
3) export tiff seq tif+alpha
4) premultiply on
5) bring into AE to check before sending to lab for output (the lab I’m using uses AE for compositing scanned film and my graphics layer to print)
6) Alpha is smaller than color7) go back to motion and hit the “v” key to toggle between color and alpha lo and behold the alpha IS smaller than color.
Project properties
8bit background color black 0% opacityHere is the kicker
1) bring in a background into Motion and the effect looks correct2) bring into Combustion and click on “Premultiplied with” in footage controls effect looks correct
3) Bring into AE (alpha shows up as straight)
load into composition alpha looks smaller
till you set the “mode” pull down to “Luminescent Premul” Voila!!!!
effect looks correct!!The communication between Motion and AE seems to be the problem.
There is no difference when I click on premultiply in AE interpret file dialog box ! (and yes I reloaded the footage).
Also When I bring the file into Photoshop the alpha appears small as well.The question I still have is why when I have sent out files for the last 10+ years with alphas there has never been a problem.
I’ve gotten files with alphas and as well and no problems.
I’m not that lucky ;/)??!!anybody have any ideas why it works this way?
mdr
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Have you tried importing the motion project directly into AE instead of an image sequence?
Jim Kanter,
Digital Film Institute
http://www.dfilminst.com -
no,
I am just checking the files as they will be output to film and the lab uses AE to composite files.
mdr
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