How to get the background color of a layer with AE SDK

Hello

I try to get the background color for my current layer, but I can't seem to find how do.

I don't want background color, background color of the application, but the color that shows through, if I set the alpha of my pixels to 0.

For example, assume that the background of the composition is black, I put a solid top, green then put a picture on top of the solid and apply my pug-in the image.

If I set the alpha to zero in my plug-in, green solid will be displayed.

So I want to be able to know that my background is green.

I tried to use PF_AppGetBgColor(), but which returns the background color of the application, which isn't green in this example.

If you want more details on what I want to do, I plug P1 which affects some 0-alpha pixels. Above it, I apply an another plugin P2 which reveals alpha-0 pixels by mixing with little color.

What is happening now is that the output is color of the original image, mixed with the color of P2 (because only modified P1 alpha pixels).

What I want is to have the color through the transparent pixels of P1 display mixed with the color of P2.

To do this, I would like to be able to set the color of pixels 0-alpha in the color of the background in P1.

Sorry for the question long.

Thanks for your suggestions.

Hello nicolas.

If I understand it, that you try to get the buffer of image layers composited under the layer with your effect.

If that is correct, then I fear that it is almost impossible to do.

When AE makes a composition he doesn't it down. He's trying to do the opposite in fact.

Why? because if at some point, the buffer is completely opaque, then he has no need to make what's below.

further more, checked the diaper changing the rendering order, and many other things affect the rendering of the layers order.

In addition, there is no API to access buffers intermediaries comp. just the end result.

the closest you can get than without turning of the world, is to use AEGP_GetCompBGColor().

that would be useless to you that the image is not composite on that color, unless it is the model being saved to the file.

so why I said 'almost impossible '?

You can transform the world.

You can write a type ECAP 'craftsman '. (look at the example of 'arti')

These plug-ins make comps (instead of the "advanced3D" converter)

a craftsman has results intermediaries comp, because he is the one doing the rendering.

so now you can have your craftsman save the buffer, you need and deliver it to your effect.

I must warn you that this is very very very difficult.

Another possible solution is to create a copy of the model resides in your effect,

erase all the layers that has the image you need and make that reproduces model using AEGP_GetReceiptWorld().

If you use this method, you must supervise the original model and apply changes to the copy.

Yes, it's too difficult to do.

you could make a change in the strategy and apply your effect to an adjustment layer instead.

the entry for the adjustment layer is the buffer underlying layers.

Then, you could get the original sources you want to treat using checked layer params.

the last solution I can think uses the expression of sampleImage() on a hidden parameter.

This will give you any layer's pixel data in the model, but not the composite of the underlying layers.

Maybe if you tried sampling adjustment layers post effects... I don't know. you need to try.

This method is very slow and is also limited to expire, so you can't get a large number of pixels.

the expression simply fails.

I hope that this was not all bad news for you.

Maybe you said more about the plug-in you develop I could come up with a better plan.

:-)

Tags: After Effects

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