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Questions tagged [alpha]

The tag has no usage guidance.

0
votes
0answers
18 views

Make a specific color in alpha channel

I have a video with red background. I would like to make this color red in an alpha channel, that is, transparent. What should I do to achieve this?
1
vote
1answer
5k views

Make white background in MP4 movie transparent

I have a short animation clip made with PyMOL software (visualizing molecules), in the MP4 format. I am going to use this animation in future presentations, and it would look much better if the ...
1
vote
1answer
986 views

Create Alpha channel-Videos (obs stinger compatible) with ffmpeg and 2 files

I have 2 video files. One file is the main content and the other file has an alpha channel emulated with black and white (white = opacity 100 and black = opacity 0). Sometimes the emulated alpha ...
2
votes
0answers
170 views

FFMPEG drops end frames when converting a unmatted alpha .mov to .webm using ffmpeg but converts fine when alpha is premultiplied?

I am using ffmpeg to convert a straight alpha .mov to a webm so I can layer videos on top of one another for a web game however when converted the duration is the right length but the frames freeze ...
0
votes
1answer
377 views

ffmpeg fade to specific color values over time

I have a background image that I'm trying to fade to specific color values using this filter: lutrgb=enable='gte(t,3)':'r=0.3*val:g=0.3*val:b=0.3*val' This almost works, but it changes the values ...
0
votes
1answer
182 views

Using brush tool for alpha channels/rotoscoping in after-effects

I'm trying to rotobrush/rotoscope a bunch of footage, see image below for what I mean. Currently I'm using the rotobrush, but it is too time-consuming and slow - it keeps trying to guess the paths, ...
0
votes
1answer
344 views

What is the difference between RGB and RGB + Alpha?

I know what is Alpha channel but when I rendered a motion logo using RGB and RGB + Alpha in After Effects, I didn't see any difference. So what's the basic difference between them and how to decide ...
7
votes
3answers
12k views

Is it possible to export a Video with transparent Background? (No Image Sequences!)

Is it possible to export a video file from After Effects with transparency? I don't want to export to an image sequence.
1
vote
0answers
60 views

export a video from Blender with alpha channel

I have a problem exporting a video from Blender (Cycles Render) with Alpha Channel. Generally it's a scene with sailplane flying about a camera positioned near to the floor. In addition to this it is ...
2
votes
1answer
92 views

Is it possible to mask out unsharp areas of footage with After Effects?

Is there any existing filter/effect, that will automatically mask out the unsharp area of my footage? Let's say I have an object in focus and a lot of depth of field. How do I show only my sharp ...
2
votes
1answer
572 views

Maya batch render missing alpha channel

I'm trying to export a scene to composite in Nuke. When I "render current frame" and save the image from there, I get an image with an alpha channel, but when I batch render the images don't have the ...