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Relative ripple mode: fuzzy math?
I’ve decided to look into the relative ripple mode since I’ve always felt that I didn’t understand how it worked, and after some testing I’ve come to the conclusion that I still don’t understand how it works.
If you read the user manual, it will tell you that the relative ripple mode changes the value of a correction by a percentage of the existing correction. This makes sense to me, however when I tested this I found that this is not the case.
For instance I have 3 shots in which I set the gain to:
shot1: 1.00
shot2: 1.10
shot3: 1.50I grouped the shots together, and with the ripple mode set to relative I changed the 3rd node from 1.50 to 1.40.
When I did the math it shows that to be a 20% change and that the resulting values should be:
shot1: not sure but I think .98
shot2: 1.08
shot3: 1.40Instead I got
shot1: .96
shot2: 1.05
shot3: 1.40What’s crazier is that if you recreate the experiment it varies each time. I’m not trying to pick on the math here, I’m just concerned about having dependable results. I’d like some explanation about what’s going on behind the scenes. If it’s as simple as, “don’t worry about it, it works,” I’ll be fine with that, I just want to make sure that when I use this feature, I’m getting the right results.
Anybody have any insight into this? Does anybody use this feature? Thanks for your time
roman hankewycz
harbor film company // colorist -
6 Replies
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Group grading is not the same as a ripple value.
A group is a correction applied to the other shots in the group
A ripple value is seperate function (no group selected)
make a change and then use the ripple value function to ripple that change through other shots,
This is only available on the BMD control surface,
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Charlie,
What are you talking about?
I’m talking about the ripple settings for group correction. You access these settings by right-clicking on the active shot within a group in the timeline.Does your comment still apply?
roman hankewycz
harbor film company // colorist -
There are two separate functions, group grading and ripple value
A ripple value and its setting in the config page does not do the same as group grading,
A group is tying a bunch of shots together, grade one shot and that exact change applies to all the shots in the group.
A ripple value is where you can make a change to a shot then using the ripple value command,
apply (as per the config settings) that grade change to the entire timeline or a selection of clips via the use or clip numbers selected.The ripple value command or action or button is only found on the BMD control surface.
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Hold on —- I take that back !
I just found the ripple function in a group…
Thanks, I learnt something today !
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Ha ha, I’m glad we got that one settled. While you’re at it though I’d appreciate it if you’d take a look at this and see what you think.
roman hankewycz
harbor film company // colorist -
hi,
well, firstly I think these parameters – like the gain – are displayed as rounded number. You can move your Hue wheel on your controller so little, that the image changes, but the number isn’t.
So I think the best to test it, is with a very simply parameter, like Saturation.
Node 1 – Saturation 100
Node 2 – Saturation 90Changed ripple mode to Relative, and brought down it to:
Node 1 – Saturation 90
Node 2 automatically adjusted to 81.No problems here:)
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