Rendering of a PF_EffectWorld color channels?

Hello

I turn the input layer with the function transform_world, resizing of the image and much buffer. But, how display only one channel at a time? I mean channels either R, G, B or has, but not the whole picture. I know not how using subpixel sampling, but I really want to know how to do without it.

Thank you!

gutsblow wrote:

I know not how using subpixel sampling, but I really want to know how to do without it.

subpixel sampling?

you could poke some eyes with...

perhaps mean you the rest of the iteration?

Anyway, I don't know any operation in the EI API that handles only specific channels.

to display a single channel, or filter your prior transformation of entry.

or your output after transformation.

I see a few ways to do this.

1. use the suites for the iteration.

These will provide you with each pixel in the input and output buffers,

and all you have to do is:

Output-> alpha = inP-> alpha;

Output-> red = 0;

Output-> Green = 0;

Output-> blue = inP-> blue;

and viola! you have removed the red and green channels. (no subpixel sampling here)

the benefits of using this method, it is the it is multithreaded and easy to manage. It can also replace the buffers of intermediate copies in the output (or input of intermediaries).

disadvantages: it manages all channels, so it is useless.

2. do it yourself approach.

get the base address of the world you want to filter and browse the world yourself.

This way you can get the PF_Plane for the channels that you want to assign, and then go directly to the correct place in the memory for this channel,

completely avoid the other channels.

benefits: is the way the less wasteful and more customizable.

disadvantages: good luck for this to be multi-threaded.

3. the approach to composition.

to display only the Red layer, create a new world and fill it in red.

composite using of composite_rect and the transfer mode "multiply".

that will remove other colors.

4. the approach of someone ' else-a-problem.

If you use smartFX, you can tell AE what channels to use.

Æ know the result of the other channels.

I've never used, so I don't know if you will only get what you want, or you will get the original entry for unused channels.

personally, I'd go with the rest of the iteration.

Tags: After Effects

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