Gray border with alpha channel

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Sergey Zinchenko

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Gray border with alpha channel

PostSat Mar 18, 2017 1:54 pm

When I add solid background I see gray lines at the borders of original image. How can I avoid that?
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Sergey Zinchenko

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Re: Gray border with alpha channel

PostSun Mar 19, 2017 7:35 am

No idea?
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waltervolpatto

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Re: Gray border with alpha channel

PostMon Mar 20, 2017 12:23 am

give us more info, does not make much sense to me.
Walter Volpatto - C.S.I.
Digital Intermediate Colorist
Fotokem, Burbank. USA
www.fotokem.com
www.coloristsociety.com

Inb4YouCanJustColorComments: yes you can, good luck with that.
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Sergey Zinchenko

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Re: Gray border with alpha channel

PostMon Mar 20, 2017 7:34 am

I place 255;255;255 solid white on the timeline. On top of that I place my video clip and using zoom make it smaller. That is to say I place my clip in the center of the solid layer. If my clip is pure white too at the borders I see those strange gray borders. It feels like anti-aliasing effect.

If you increase zoom at your any clip to its max value you will see the same gray lines at the borders of it.
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waltervolpatto

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Re: Gray border with alpha channel

PostMon Mar 20, 2017 2:44 pm

Sergey Zinchenko wrote:I place 255;255;255 solid white on the timeline. On top of that I place my video clip and using zoom make it smaller. That is to say I place my clip in the center of the solid layer. If my clip is pure white too at the borders I see those strange gray borders. It feels like anti-aliasing effect.

If you increase zoom at your any clip to its max value you will see the same gray lines at the borders of it.


it looks like you're zoomed 1000%, if so, yes the outermost pixel can be interpolated hence gray.
Walter Volpatto - C.S.I.
Digital Intermediate Colorist
Fotokem, Burbank. USA
www.fotokem.com
www.coloristsociety.com

Inb4YouCanJustColorComments: yes you can, good luck with that.
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Sergey Zinchenko

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Re: Gray border with alpha channel

PostMon Mar 20, 2017 4:03 pm

But I see that blinking line even without zoom. Do you know any way to avoid that?
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Sergey Zinchenko

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Re: Gray border with alpha channel

PostTue Mar 21, 2017 10:50 am

I tried almost everything. And still don't know what is the reason.
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Peter Cave

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Re: Gray border with alpha channel

PostWed Mar 22, 2017 9:26 am

Image scaling preferences will fix this.
Bilinear removes the issue, as does Optimise for playback option when playing the video.
Read the manual to see how these options work.
post-production starts with pre-production

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