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Stefan Coory
Clamp
on Jul 23, 2013 at 12:24:15 am

Hey guys

So I am a little confused as to the way clamping is working in 2013.
I have 16bit float images in an MK and and upon adding a blend&comp node i see the clipping. No matter which settings I change regarding clamping I cant get rid of it.
I tried adding clamp nodes to things earlier in the tree with no success.
I would just use logic op node but this appears to be broken.

Anyone know if I am doing something wrong or a workaround?

Thanks
Stefan


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Grant Kay
Re: Clamp
on Jul 23, 2013 at 10:10:50 am

Hi Stefan,

I just had a look at the blend and comp in the modular keyer.

I loaded in images with values of 2.0 into the node and composited them together.

There are 3 clamp options in the blend and comp node. Input 1, input 2 and rendering.

With all the options set to NO CLAMP, I sampled the values using the colour pickers on the far left of the UI and the values I was getting where well above 3.0 with no clipping.

If any of the Clamp options were enabled, than the whites were being clamped to 1.0. This is what I would expect.

The nodes should not clamp any colour values unless you told it to do so in the above example.

With all your material being 16bit float, there should not be any issues.

Is there a screenshot you can post for me to look at if you still have issues?

Regards
Grant

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Stefan Coory
Re: Clamp
on Jul 23, 2013 at 11:04:13 pm

Hi Grant

Thank you so much for taking the time to do that!

I seemed to have figured it out. Altho I could only see the clamping pixelation in Blend&Comp it appears to have been coming from the CC nodes. I turned on clamping in all of those (with clamping off in the Blend&Comp) and it looks to be sorted.

Thanks again mate

Regards

Stefan


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