8-bit project, no banding in preview / rendering individual frames, but bands occurs on the final rendering.
I work with 8-bit video that must be highly classified and darkened.
While I was working on, I noticed when I step in the timeline and stop to look at a framework, strips are produced, but as soon as I change a setting of one of the effects of one of my adjustment layers, banding goes and everything is mixed smoothly.
When I visited on an image preview of the same section, the output is well mixed too.
However, when I visited the final video coder via media, banding is back and very hard.
Why is this happening? If I'm in 8 bit mode, why and how is after effects able to show me these perfectly mixed previews not banded?
Bands will arrive in 8-bit images if there not enough space in the color values to make the transitions smooth. For example, if you have a blue gradient which covers 250 pixels and blue 200 to 250 changes in value you will have to 10 bands of color in the gradient. If your preview is full resolution and magnification factor is 100% you will see bands if you look closely. When you return to compression MPEG problem strips is increasing especially in areas smooth transitions of color because very large blocks of pixels are averaged together and you get only a few images of the color information that represent the actual pixels in the project. You can try to improve the color of artifacts in Adobe Meida encode by checking the high quality in color options and you can also reduce color artifacts by activating multi pass rendering and increase the flow of data a bit.
The best practice is to add some noise to the shooting so the MPEG compression more data that evolves to work with. This will tend to hide the strips by decomposing generally straight between the color values.
If you do heavy color of ranking you should show your project to 16 or 32 bit color still better. This will remove strips in 8-bit images. Unless you have a little bit of 10 or better track and a GPU capable of driving, it is really hard to judge bands by watching a preview of the model. The info panel should show the information of the right color, but it is very difficult to actually see in the monitor, especially if you're judging a frame to nothing less than full resolution and 100%. The perfectly blended frames are probably artifacts or your eye is fooled. Purge the cache of the images to see exactly what is happening in the framework. Depending on your graphics card may be fouling up previews trying to create previews of superior quality that actually exist preferences. You could also get some funky video original data if the source is a highly compressed MPEG stream. The CPU can also add to preview search OK when the values aren't really there because on average it is the small amount of color and luminance values in the 'master' frames and frames him "gee I'm not really a framework but here is a bit of data on where I think that pixels will". Don't forget that the I'm not really a frame number box frames by 2 or 4 to one. Actual color even in real managers information can be compressed on average in large blocks as well. All this contributes to the subtle color changes problems. This is why assistance of noise.
I hope this helps.
Tags: After Effects
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