Inverting a value between expressions

[Dan Ebberts]

since the flare brightness can go up to 300% you probably need to define a maximum value. Play around with this:

maxValue = 200; // try 100 if this doesn’t seem right
maxValue – effect(“Lens Flare”)(“Flare Brightness”)

Dan

[Mitch Temkin]

Hi Dan –

Thanks for the reply. I’m still not getting things to work. Probably because I don’t know scripting language for expressions.

When I pick whip the brightness of the second lens flare to the brightness of the first flare, I get this:

thisComp.layer(“lensflare03″).effect(” Light Factory EZ”)(“Brightness”)

I’ve tried appending the code you sent in a variety of ways and can’t seem to get it right.

Any more help?

Thanks,

Mitch

thisComp.layer("lensflare03").effect(" Light Factory EZ")("Brightness")

[Dan Ebberts]

Ah, OK – try this:

maxValue = 100;
maxValue – thisComp.layer(“lensflare03″).effect(” Light Factory EZ”)(“Brightness”)

Dan

[Mitch Temkin]

You are a genius! It works perfectly if I tweak the maxValue to 150.

Can you explain to me why this creates an inverse value?

Thanks again!

Mitch Temkin
Video & Grfx Production
864 Almond Drive
Watsonville, CA 95076
831-722-9767 [office]
831-241-2344 [cell]
juxtaposer@charter.net

[Dan Ebberts]

The expression just sets the value of the second flare by subtracting the value of the first flare from 150. So when the first flare is 150 the second is zero, when the first flare is 75 the second is 75, etc.

Dan

[Mitch Temkin]

Thanks again!

I wish all my art background had prepared me for a little programming.

Expressions are great when I can get ’em to work! They’re easy to conceive, but harder to code.

Mitch Temkin
Video & Grfx Production
864 Almond Drive
Watsonville, CA 95076
831-722-9767 [office]
831-241-2344 [cell]
juxtaposer@charter.net