Image quality degradation when importing into AE from Premiere Pro - Adobe After Effects

This is a discussion on Image quality degradation when importing into AE from Premiere Pro - Adobe After Effects ; Hello, after I export a lossless/uncompressed AVI from Premiere Pro into After Effects the video quality appears to have degraded (become heavily aliased), and I'm unsure what I'm doing wrong! It's a computer generated menu sequence created from scratch in ...

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Image quality degradation when importing into AE from Premiere Pro

  1. Default Image quality degradation when importing into AE from Premiere Pro

    Hello, after I export a lossless/uncompressed AVI from Premiere Pro into After Effects the video quality appears to have degraded (become heavily aliased), and I'm unsure what I'm doing wrong!

    It's a computer generated menu sequence created from scratch in Premiere Pro.

    I'm very careful to select identical resolutions in both Premiere Pro and After Effects - 720x576 25fps, and both with 1.07 pixel ratio (for PAL DVD). I have not shifted the position of the animation in AE either by whole- nor sub-pixels. "Best" render settings are used both in AE and PremPro when previewing, and the magnification of the preview windows are locked to 100% as well as the correct "TV pixel ratio correction" settings to avoid distortion when previewing (the distortion/aliasing is still clearly visible on the previews, though). The preview settings are irrelevent anyway as exporting from AE (using lossless AVI) clearly shows the same degradation when imported back into PremPro.

    <http://www.gobo.dsl.pipex.com/images/Original-PPro.png>

    ^ The image quality when digitally exporting from PremPro.

    <http://www.gobo.dsl.pipex.com/images/Imported-AE.png>

    ^ The image quality after importing it into After Effects (and then digitally exported back out of AE).

    Exporting from PremPro is definately lossless as I have loaded the original exported file back into PremPro and A/B'd it under a microscope with the original compositions and they are absolutely identical - no visual distortion whatsoever - so the problem lies definately with me importing it into AE.

    I did notice that Premiere Pro's PAL pixel ratio is 1.067, while AE uses 1.07, could that be the cause? Or an interlacing issue? (I created the original project as progressive, and exported to AE as progressive. I couldn't see an interlacing setting for working within AE projects, only for exporting, which I again selected as progressive.)

    Scratching my head a bit, I must have overlooked something. Sorry for the long post but it's buggin' me!

    Thanks

  2. Default Re: Image quality degradation when importinginto AE from Premiere Pro

    The issue is display-based only. By default, AE interprets DV resolution footage as Lower Field First. Because AE previews frames only (not fields) you end up only seeing one field during preview. This is only a preview issue, and shouldn't affect your output files, so long as you render interlaced output. If you still see the issue on output, you are probably rendering non-interlaced output.

    You can turn field interpretation off during design work to see both fields, but remember to turn it back on before rendering interlaced output.

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