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50% gray problem
In After Effects, I’ve changed footage of a blue sky with white clouds into a stormy sky (light gray/yellow sky, dark gray clouds) by inverting it using Curves and adjusting the parameters of each channel. I’m happy with the results and want to transition this sky back to the original blue sky over time. The problem is, no matter how I try this, midway through the transition, everything is blown out to 50% gray. I’ve keyframed the Curves effect, and used multiple layers of the footage and keyframed opacity, still to no avail.
If any Masters have a solution or suggestion, I would greatly appreciate it!ChiBrad
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3 Replies
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You’re trying to dissolve but the contents of the alpha channel are popping through, seems to me, but I’m not watching over your shoulder. Render two copies of the layer, one with your effects, one without. Do the dissolve between the two movies.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”
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If, as you say, you have actually inverted both chroma and luma values, at 50% transpareny you will get 50 ire grey. The one is cancelling out the other, you are reaching the point where it is the equivelant of dissolving between 0 ire black and 100 ire white. Don’t do an invert, modify the colors/luma yourself.
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I would suggest looking at a different blend mode for your transition (‘Normal’ will average A and the inverse of A into 50% gray). Perhaps ‘Lighter Color’ or even ‘Screen’?
Alternatively you could place a sky blue solid below both layers and offset the fades so that there is essentially a subtle ‘dip’ to blue between the fades.
The other option would be to create your stormy sky by some other means.
Darby Edelen
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