How to access and change any adjustment layer properties after created

Guys, I appreciate a lot your help! I found a very easy way to do it, this study helped me to understand better Action Managers behavior ! It is so exciting learning this stuff tho!

First Irecorded with script listener a brightness and contrast adjustment directly into a layer. Studied the settings and how they were applied with which action descriptor, seems Actions Manager actions works hierarchically, so I just simplified variables and stuff.

Then I recorded again with script listener how an adjustment layer is created with Action Manager but added another action descriptor in the hierarchy to with the settings of the adjustment layers, seems to work the same for everyone of them.

Also found that putInteger() and putDouble() works the same haha!

Here is the code I built to create and adjustment layer with the desired settings, i tried some stuff also with random values to have differente results

What this code does is it creates a ColorBalance adjustment layer with randome balues on the different levels, and it checks if there´s any layer name "NewColorBalance", if so, it removes that layer and creates another ColorBalance adjustment layer with random settings.

If you rename the layer, it creates another adjustment layer and name it NewColorBalance.

function colorBalanceAdjLayer) {

var layLen = app.activeDocument.layers;

var actLayer = app.activeDocument.activeLayer;

var i;

for (i = 0; i < layLen.length; i++) {

if (layLen.name == "NewColorBalance") {

app.activeDocument.layers.getByName("NewColorBalance").remove();

}

}

function s2t(s) { return app.stringIDToTypeID(s) }

//Declaring variables////////////////////////////////////////////////////////////////////////////////////////////////

var ranD1 = Math.floor(Math.random() * (10 - 0 + 1) ) + 0

var ranD2 = Math.floor(Math.random() * (10 - (-10) + 1) ) + -10

var ranD3 = Math.floor(Math.random() * (0 - (-10) + 1) ) + -10

var ranD4 = Math.floor(Math.random() * (10 - (-10) + 1) ) + -10

var ranD5 = Math.floor(Math.random() * (10 - (-10) + 1) ) + -10

var ranD6 = Math.floor(Math.random() * (10 - (-10) + 1) ) + -10

var ranD7 = Math.floor(Math.random() * (0 - (-20) + 1) ) + -20

var ranD8 = Math.floor(Math.random() * (10 - (-10) + 1) ) + -10

var ranD9 = Math.floor(Math.random() * (10 - 0 + 1) ) + 0

var d1 = new ActionDescriptor();

var d2 = new ActionDescriptor();

var aRef = new ActionReference();

var d3 = new ActionDescriptor();

var d4 = new ActionDescriptor();

var d5 = new ActionDescriptor();

var l1 = new ActionList();

var l2 = new ActionList();

var l3 = new ActionList();

// Class of what is MADE////////////////////////////////////////////////////////////////////////////////////////

aRef.putClass( s2t( "adjustmentLayer" ) );

d1.putReference( s2t( "null" ), aRef );

//===============================================================

//===============================================================

//Adjustment layer properties////////////////////////////////////////////////////////////////////////////////

l3.putInteger( ranD1 );

l3.putInteger( ranD2 );

l3.putInteger( ranD3 );

d3.putList( s2t("shadowLevels"), l3 );

l2.putInteger( ranD4 );

l2.putInteger( ranD5 );

l2.putInteger( ranD6 );

d3.putList( s2t("midtoneLevels"), l2 );

l1.putInteger( ranD7 );

l1.putInteger( ranD8 );

l1.putInteger( ranD9 );

d3.putList( s2t("highlightLevels"), l1 );

d3.putBoolean( s2t("preserveLuminosity"), true);

//Type of adjustment layer//////////////////////////////////////////////////////////////////////////////////////

d2.putObject( s2t( "type" ), s2t( "colorBalance" ), d3 );

//===============================================================

//===============================================================

d1.putObject( s2t( "using" ), s2t( "adjustmentLayer" ), d2 );

//CREATE ADJUSTMENT LAYER ACTION///////////////////////////////////////////////////////////////

executeAction( s2t( "make" ), d1, DialogModes.NO );

// First step is to MAKE the object

app.activeDocument.activeLayer.name = "NewColorBalance"

}

Also about the scriptlistener or recording things done in Photoshop.  Some things that are recorded are recorded in a delayed fashion.  That is while you making some adjustments nothing is recorder. So you can make many trial adjustments till you find the one that suites you.  When you move on to your next Photoshop step.  Photoshop will record the last adjustment you made for your previous step.   That way only the adjustment you want is recorded.  So if you had a problem with Scriptlistener not recording your Adjustment it is very likely it was in delayed recording mode waiting for you to move on to your next Photoshop function.  Some times you need to move on for a step to be recorded. 

What kind of adjustment layer data do you want to read or change? Different types of layers contain different data.
For the "Levels" type, you can examine this code.

Re: Modifying Levels Adjustment Layer?

you have to convert the level to an advanced object

and then change the level properties.