How to re - apply a mask after changing the alpha channel?

Hello

I am writing a plugin that modifies the alpha channel of the layer.

My problem is I want the mask effect to apply after my own effect.

For example, I found a few pixels that were originally invisible (their original alpha is 0 and I put it to the maximum), but I don't want to reveal the pixels that are killed by the mask.

I tried to use PF_MaskWorldWithPath, but how do I find the values that are used for the feather and opacity?

It seems possible to find them using AEGP_GetNewMaskStream, but I could not find any description of how to interpret the results, not to mention that it's very complicated to get all the handles that are required to use this feature because my plugin is not CEAP.

And on top of that, it doesn't seem to be a way to simulate the extension mask feature.

No idea how that was possible?

Thanks in advance!

My friend

you have stumbled upon something large and problematic.

Let's start the bad news:

You can not PF_MaskWorldWithPath make the expansion of mask for you.

It doesn't have this entry. to re-create a master expanded, you will need to make this mask on your own.

given there is no extension on one of the masks, you could use PF_MaskWorldWithPath on each mask and composite in transfer mode right on top of the other.

finding the original matte for the layer masks.

Yes, it's an awkward process, but it's the only way to use the mask data for a cache.

to read the pen, opacity, all other values of the mask, you use AEGP_GetNewMaskStream or AEGP_GetNewMaskOpacity (I don't know what functions separated for the opacity).

and then AEGP_GetNewStreamValue to access the actual numeric value.

There is another method, you can use, which is not perfect, but much easier to use.

get you initial pixel in the layer using a hidden layer param and PF_CHECKOUT_PARAM (or checkout_layer for smartFX).

compare these original pixels (which have no masks applied) to pixels in entry of the effect (with masks applied to them).

the difference between the two alpha is (for the most part) the matte of the masks.

assuming that your effect is first in the stack (or the first affecting the alpha), you should get one if bad no solution that would allow you to save a world of hurt.

trying to recreate precisely the masks.

There are even more complicated shapes, involving layers dummy and artificial effects, but it sems to me as if he didn't miss the point.

I hope this has helped.

:-)

Tags: After Effects

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