Mask for some frames?

I wish I had a mask only for a time on my images. I mean, it's... I have 30 seconds of footage, I want to leave say 10s and 15s to see that some of my images, the rest when I want images unmasked. After this point, I don't want anything hidden more head room. How I managed to do this was by double-clicking on the rectangle tool (this mask set whole sequences). Can I use hold keyframes to change the mask at the desired time. Is there a way to say just After Effects to turn off the mask (see the sequence with no masks) on some images. Thank you

There are about a dozen ways I can think of to achieve your goal.

  1. Use the track matte and simply animate the opacity. You could use a duplicate of your images with a mask or just draw a shape layer.
  2. Put two masks on your film. The first would be created by selecting the film layer and double click on the rectangle tool. The second mask will be drawn to hide the box allowing you to hide or show. Then the mask modes would be possible to assign to add and animate you the opacity of the rectangular mask.
  3. Draw a mask and then animate mask expansion. This would give a nice effect if you also anime feather mask as the expanded mask.
  4. Use Effects > channels > presets and animate Alpha Set of Alpha to full
  5. Use Effects > channels > channel shift and animate take Alpha's Alpha to full
  6. If you use CC 2014 you could use effect > channels > presets with alpha set to Off, then add an option of composition using the mask and animating the opacity

I could go on and. If there is no animation required for a mask I almost always use a matte. I find much easier to deal with for most of the projects.

Tags: After Effects

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