Few expression questions.

Ok now I remember someone asked this before But I have tried and it didn’t work for me.

I have created a global control layer, on this layer I am placing all the effects. Now…

(Important) How to make a Check box invert a color. Lets say I have > Channel > Invert effect and I want it to be either 0 or 100 when box is Checked or UnChecked.

(Important) How to make a Slider Control not to go above 100?? I know the effect value stays max 100 (if it has only 100), but the slider of that expression linked Slider Control goes up anyway.

(Not so important) Is there any possible way to select blending mode of certain expression linked layer in the effects window ? I know there is expression called Layer Control. I am almost certain I can’t.. but maybe… and one more thing. Can I expression link blending modes ? Like if I select one layer to be Overlay so that another layer does it automaticaly..

Maybe there should be Felt’s phone number in bold on the Videohive web heading? He is the savior of expression world.

cyzer said
Ok now I remember someone asked this before But I have tried and it didn’t work for me.

I have created a global control layer, on this layer I am placing all the effects. Now…

(Important) How to make a Slider Control not to go above 100?? I know the effect value stays max 100 (if it has only 100), but the slider of that expression linked Slider Control goes up anyway.

(Not so important) Is there any possible way to select blending mode of certain expression linked layer in the effects window ? I know there is expression called Layer Control. I am almost certain I can’t.. but maybe… and one more thing. Can I expression link blending modes ? Like if I select one layer to be Overlay so that another layer does it automaticaly..

the slider one is easy.Right click edit value.
IMHO the blending stuff you can`t do that, but let s wait the Guru…

cyzer said
(Important) How to make a Check box invert a color. Lets say I have > Channel > Invert effect and I want it to be either 0 or 100 when box is Checked or UnChecked.

You need to use an if-statement for that:

if(pickwhip with checkbox == true) 0; else 100;

of course you don’t typ the pickwhip, you do it

I think i know how to limit the value to 100. You use clamp[min,a,max] and then set a equal to your slider. I’m pretty bad with expressions but that’s the best i can do, definitley wait for the expression king.

GrizzleFX said
I think i know how to limit the value to 100. You use clamp[min,a,max] and then set a equal to your slider. I’m pretty bad with expressions but that’s the best i can do, definitley wait for the expression king.

Nearly, but not quite.

clamp(value, 0,100); // round brackets, number to clamp, min, max

Note: the keyword “value” refers to the property’s own pre-expression value, so you can actually use that line, as written, on a slider to clamp it between 0 and 100

@Flash: IIRC , the right click and edit value only calibrates the slider that you see in the Effect Controls window. It doesn’t actually clamp the value.

Creattive said

cyzer said
(Important) How to make a Check box invert a color. Lets say I have > Channel > Invert effect and I want it to be either 0 or 100 when box is Checked or UnChecked.

You need to use an if-statement for that:

if(pickwhip with checkbox == true) 0; else 100;

of course you don’t typ the pickwhip, you do it

You can do it with a ternary too… it’s a bit smaller:

theChkBx = layer("global controller").effect("Color Checkbox Ctrl")(1).value;
theChkBx ? 0 :100;

I always like to separate long property references into their own variables (that’s what the first line is). It’s good practice, especially once your expressions start to get longer.

I usually explicitly include the “value” on the end of a property reference. After Effects usually defaults to using the value (instead of the object reference of the property). But in certain situations it doesn’t, so it pays to be explicit.

cyzer said
(Not so important) Is there any possible way to select blending mode of certain expression linked layer in the effects window ? I know there is expression called Layer Control. I am almost certain I can’t.. but maybe… and one more thing. Can I expression link blending modes ? Like if I select one layer to be Overlay so that another layer does it automaticaly..

Blending modes can neither be read nor set with expressions.

You can do it with scripting, but that’s a whole other story.

cyzer said
Maybe there should be Felt’s phone number in bold on the Videohive web heading? He is the savior of expression world.

It’s an 0800 number. Calls are charged at $19.99 a minute.

And the award for most replies in a row goes to…