Flipping a Keyframe Chart

[brianb21114754]

I need to flip my keyframes for opacity.

I am using the graph to align the keyframes and I need to flip them all to exactly their opposite values.

So all the ones on 100 percent opacity need to go to 0, 90 to 10 etc.

The reason it has to be flipped precisely is because it is coordinated with other animations.

I am quite new to after effects.

I would appreciate any help, thanks.

[David Arbor]

This is very easy to do with the command "Time-Reverse Keyframes." You can select your keyframes, right-click on one of them, mouse down to "Keyframe Assistant," and choose "Time-Reverse Keyframes."

This command doesn't have a keyboard shortcut assigned to it by default, but you can add your own by going to the Keyboard Shortcut Editor (Edit>Keyboard Shortcuts), searching for "Time-Reverse" and applying one. I use Cmd/Ctrl+Shift+R.

[brianb21114754]

Appreciate the help mate but as far as I am aware that is only changing the x values so its putting the end to the start etc. (I think)

I need the Y values themselves flipped and the X to stay the same, do you know of any way to do this?

I am unsure if flipped is the right word.

Like for everywhere it is at 90 percent opacity. I need it to be 10 on the same x point.

For everywhere it is at 14% I need 86%. With x point remaining the same.

Appreciate the help.

[Roei Tzoref · Accepted solution]

not such a feature in Ae in a native way.

you can do this with an expression, but it will apply to all the keyframes in that property.
type: 100-value in the expression text field.

if you need certain keyframes to do that, you can do this manually or create/find a script that does this.

[David Arbor]

Can you post a screenshot of what you have? If you're only dealing with Opacity and you want one set of keyframes to go from 100%-0% while the other goes from 0%-100% then Time-Reverse Keyframes will do the trick.

You can also do this with the Linear expression which would allow you to not have to make multiple sets of keyframes. You put the expression on the opacity property you want reversed and say "hey, when this defined layer goes from 0-100, I want you to go from 100-0" That would look like this GIF.

If you copy the keyframes from layer 1 to layer 2, then perform the Time-Reverse Keyframes command you'll get the screenshot below.

If you're trying to do something else with Position or Scale (I'm not sure because you mentioned the X and Y values separately) then let me know and I'll show you how to flip those values via the Graph Editor.

[brianb21114754]

The above poster seems to work, I just did it all manually in the end as it was only a practice project so it did not need to be exact.

It was for a flickering effect with a lightbulb and rays coming out of it, the rays were visible at the start whereas the light from the bulb wasnt and both should not have came in for a few seconds.

More of a design flaw in photoshop, that I was trying to fix without going back to photoshop.

However it was a non-linear flicker that I created manually again, so using time reverse did not work as it was out of sync with the other one then.

Probably well over complicated, but as I said I am new.

Thanks for the help.