Invert Mask Option

[omar brown]

Can we get the option to invert the mask inputs in the color correction and grade nodes. In is available on the merge node. This can help keep the node graph area cleaner without a lot of nodes to do a simple tasks.

[Alexandre]

We did it in the past, but we removed it , this is not technically possible because of the way OpenFX is designed. The best you can do is plug an invert node in-between.

On Jun 24, 2014, at 4:48 PM, omar brown <vegas...@gmail.com> wrote:

> Can we get the option to invert the mask inputs in the color correction and grade nodes. In is available on the merge node. This can help keep the node graph area cleaner without a lot of nodes to do a simple tasks.
>

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[Frédéric Devernay]

Yes, it is possible -> next version

[Frédéric Devernay]

just added it to:
- ColorCorrect
- Grade
- Invert
- Merge
- TransformMasked
- CornerPinMasked

see https://github.com/devernay/openfx-misc/commit/0e3b9566bcbc662cece65b987fa91059305e897f

[mackd...@gmail.com]

These are great, but useful option would be for the Invert node to work with a mask. For example, I have a roto. I plugged in an Invert node after it, and the alpha did not invert. That would be amazingly useful if that worked. Inverting rotos/mattes/channels is happening all the time in compositing.

[Vegas Editor]

Also while using the invert mask option, I think you should have the ability to premultiply and unpremultiply the inverted matte. Better yet, have the ability to allow each node with mask inputs to be able to inject the alpha channel downstream.

This is your season
Omar Brown
Blessed House Media

[Frédéric Devernay]

The invert nodes has parameters. You can invert alpha with it.
Anyway, almost all nodes using masks can now optionally invert the mask

[Frédéric Devernay]

Premult and unpremult nodes are in the upcoming release.
We could add a "RGB is premultiplied" check box to invert, but I' m afraid it would lead to cases that are difficult to handle (eg what happens if you invert alpha on a premultiplied image)
I think it' s better to explicitly use unpremult/premult in that case

Fred

[mackd...@gmail.com]

It's not working for me. An invert node after a roto node only shows a black alpha. The "inverted" button in the roto node itself works, however.

[Vegas Editor]

What is the output of the roto node set to? Is it set to alpha or RGB?

This is your season
Omar Brown
Blessed House Media

[mackd...@gmail.com]

I've tried both, neither works.

[Vegas Editor]

Can you provide a screen shot of what you are trying to do?

This is your season
Omar Brown
Blessed House Media

On Jun 24, 2014, at 2:39 PM, mackd...@gmail.com wrote:

I've tried both, neither works.

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[mackd...@gmail.com]

Sure thing. Here is a normal roto.
https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_01.jpg

Here it is inverted using the button in the roto node itself. Works great!
https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_02.jpg

Here it is using the invert node instead of the checkbox. I was thinking it would be the exact same result.
https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_03.jpg

And just to be sure, I clicked the alpha button on the invert node, too.
https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_04.jpg

[Sean Kennedy]

Hmm, still not working for me. Maybe it's a Windows thing.

---

Subject: Re: Invert Mask Option
From: immar...@gmail.com
Date: Tue, 24 Jun 2014 21:03:06 +0200
CC: Natro...@googlegroups.com
To: mackd...@gmail.com

This is maybe a cache issue. Try clearing the cache from the cache menu (click clear memory + disk cache). 

Here is a screenshot of a similar graph (though with the current dev version of Natron, maybe it has fixed something):

[Omar Brown]

try an see if you only have the alpha checked and the rgb unchecked both was with the roto output being rgb or alpha. It seems to me that the Invert node is canceling out the the roto node alpha output. it could be an issue with the premultiplying of the alpha output of the roto and premultiplying again on the invert. I am not a coder and I can be wrong.

[Alexandre]

This is maybe a cache issue. Try clearing the cache from the cache menu (click clear memory + disk cache). 

Here is a screenshot of a similar graph (though with the current dev version of Natron, maybe it has fixed something):

On Jun 24, 2014, at 8:56 PM, mackd...@gmail.com wrote:

[Omar Brown]

I had reproduced your script layout and I get the same results, Sean.  By the way, what graphics card are you using and does it fully comply with GPU requirements.  That might be the reason. My card’s kernel is old as the first grain of dirt.

On Jun 24, 2014, at 3:26 PM, Sean Kennedy <mack_...@hotmail.com> wrote:

Hmm, still not working for me. Maybe it's a Windows thing.

---

Subject: Re: Invert Mask Option
From: immar...@gmail.com
Date: Tue, 24 Jun 2014 21:03:06 +0200
CC: Natro...@googlegroups.com
To: mackd...@gmail.com

This is maybe a cache issue. Try clearing the cache from the cache menu (click clear memory + disk cache). 

Here is a screenshot of a similar graph (though with the current dev version of Natron, maybe it has fixed something):

<Screen Shot 2014-06-24 at 9.01.59 PM.png>

On Jun 24, 2014, at 8:56 PM, mackd...@gmail.com wrote:

Sure thing. Here is a normal roto.
https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_01.jpg

Here it is inverted using the button in the roto node itself. Works great!
https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_02.jpg

Here it is using the invert node instead of the checkbox. I was thinking it would be the exact same result.
https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_03.jpg

And just to be sure, I clicked the alpha button on the invert node, too.
https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_04.jpg

[Alexandre]

It has nothing to do with the graphic card don't worry, this is more like a bug in the rendering engine.

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[Vegas Editor]

Okay cool

This is your season

Omar Brown

Blessed House Media

[Frédéric Devernay]

OK, the problem is that you misused the invert node.

By default, the invert node only inverts R, G and B (I thought this was a good default, but obviously it's not)

You have to check the "A" box if you want A inverted by the node
I'll change the default so that all channels are inverted by default.

I may add the (un)premult option to all color correction nodes (Grade, COlorCorrect, Invert) later

f

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[mackd...@gmail.com]

If you look at the 4th image I posted, I did try it with the Alpha checkbox checked, as well.

https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_04.jpg

[Frédéric Devernay]

cool, a new bug!

Le 25 juin 2014 à 00:35, mackd...@gmail.com a écrit :

> If you look at the 4th image I posted, I did try it with the Alpha checkbox checked, as well.
>
> https://dl.dropboxusercontent.com/u/10553822/Natron%20stuff/roto_invert_04.jpg
>

[mackd...@gmail.com]

Hahahaha, great attitude! :)

[Alexandre]

I almost fixed that bug, it should be fixed soon

On Jun 25, 2014, at 5:03 AM, mackd...@gmail.com wrote:

> Hahahaha, great attitude! :)

[Alexandre]

Fixed with https://github.com/MrKepzie/Natron/commit/c4c5ef8e97d807e97e58c462b809305ff1bbb40e