Ryan Hill
Forum Replies Created
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Duplicate the stars you want to twinkle. Play with the contrast to get them as white as possible and the sky as black as possible. Duplicate it again. Apply a directional blur to both layers, at 90 degrees to one another. Precomp the two together. Add some sort of wave motion as a track matte. Possibly animate the directional blurs so they rotate a little bit. Do more than two blurred layers if you want more points to your stars.
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Put the mask on another layer, rotate the layer, use it as an alpha channel track matte.
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Select the name, hit enter.
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To get into 3D view, you must add a camera, and have at least one layer in 3D mode. There’s a check box on each layer, under a column with a picture of a box. When you check that, it will turn the layer 3D.
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At first, the idea of motion tracking a still photo where the only movement was created by you in After Effects seems useless.
But for this example, tracking a point on a still image could be used to avoid complicated math. I mean, I could sit down and figure out the expression for moving the logo based on the scale of the background image, or I can motion track a point of the image. Sometimes the second approach is going to get the job done faster than the first approach.
Plus, I’m now toying around with ideas for distorting an image of dots, and tracking the dots to get interesting movement patterns.
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Is it possible to apply it to only part of footage? Yes.
Probably the easiest way to do so would be if you make two copies of the layer. Apply the key to one copy, apply the mask to the other.
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There is the channel arithmetic filter. For the red layer, use the red channel minus the green and blue channels.
For white, desaturate and threshold.
But this is with the understanding that the colours are really “pure,” and seems so obvious that there must be something I’m missing.
I have the long-term goal of learning to write plug-ins, and then I can make my own keying formulas.
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He may have meant use RGB to mask out everything that isn’t white.
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If it really contained only “pure” colours, then I don’t understand why it couldn’t be keyed cleanly. Did the composition match the dimensions of the file? Are there mixed colours, like red and blue overlap to make purple?