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J
jakebend
Participating Frequently
October 11, 2013
Answered

Modifying Levels Adjustment Layer?

  • October 11, 2013
  • 4 replies
  • 11034 views

I'm using PS CS6 x64 for Win7. I'm trying to figure out how to change the values on a "levels" adjustment layer using javascript. I can't find any info anywhere. Oddly, the scripting listener doesn't seem to pick up modifications to the adjustment layer.

Anybody have any luck with this?

(Edit: more info)

This topic has been closed for replies.
Correct answer DBarranca

Another route could be this function that lets you specify inputWhite, inputBlack, gamma, outputWhite, outputBlack

setLevelAdj = function(inBlack, inWhite, gamma, outBlack, outWhite) {
  var d, d1, d2, l, l1, l2, r, r1, s2t;
  if (outBlack == null) {
    outBlack = 0;
  }
  if (outWhite == null) {
    outWhite = 255;
  }
  s2t = function(s) {
    return app.stringIDToTypeID(s);
  };
  d = new ActionDescriptor();
  r = new ActionReference();
  r.putEnumerated(s2t('adjustmentLayer'), s2t('ordinal'), s2t('targetEnum'));
  d.putReference(s2t('target'), r);
  d1 = new ActionDescriptor();
  d1.putEnumerated(s2t('presetKind'), s2t('presetKindType'), s2t('presetKindCustom'));
  l = new ActionList();
  d2 = new ActionDescriptor();
  r1 = new ActionReference();
  r1.putEnumerated(s2t('channel'), s2t('channel'), s2t('composite'));
  d2.putReference(s2t('channel'), r1);
  l1 = new ActionList();
  l1.putInteger(inBlack);
  l1.putInteger(inWhite);
  d2.putList(s2t('input'), l1);
  d2.putDouble(s2t('gamma'), gamma);
  l2 = new ActionList();
  l2.putInteger(outBlack);
  l2.putInteger(outWhite);
  d2.putList(s2t('output'), l2);
  l.putObject(s2t('levelsAdjustment'), d2);
  d1.putList(s2t('adjustment'), l);
  d.putObject(s2t('to'), s2t('levels'), d1);
  return executeAction(s2t('set'), d, DialogModes.NO);
};

Davide

4 replies

Kukurykus
Kukurykus
Legend
March 11, 2018

That's probably bug. To force ScriptListener to record changes made to Adjustment Layer you have for example to choose / create other layer. When you then open SL log you will find 2 new records while the 1st refers changes to Adjustment Layer.

photogyulai
photogyulai
Inspiring
September 9, 2015

I guess i was lucky and after several try the script listener did pick up the settings of the levels adjustment layer setting.

I saw some code up here, but it didnt worked for me (maybe cos different version?! i dont know)


So here is the result >>

(i put some comment where the adjustable variables are)

var idsetd = charIDToTypeID( "setd" );

    var desc5 = new ActionDescriptor();

    var idnull = charIDToTypeID( "null" );

        var ref2 = new ActionReference();

        var idAdjL = charIDToTypeID( "AdjL" );

        var idOrdn = charIDToTypeID( "Ordn" );

        var idTrgt = charIDToTypeID( "Trgt" );

        ref2.putEnumerated( idAdjL, idOrdn, idTrgt );

    desc5.putReference( idnull, ref2 );

    var idT = charIDToTypeID( "T   " );

        var desc6 = new ActionDescriptor();

        var idpresetKind = stringIDToTypeID( "presetKind" );

        var idpresetKindType = stringIDToTypeID( "presetKindType" );

        var idpresetKindCustom = stringIDToTypeID( "presetKindCustom" );

        desc6.putEnumerated( idpresetKind, idpresetKindType, idpresetKindCustom );

        var idAdjs = charIDToTypeID( "Adjs" );

            var list1 = new ActionList();

                var desc7 = new ActionDescriptor();

                var idChnl = charIDToTypeID( "Chnl" );

                    var ref3 = new ActionReference();

                    var idChnl = charIDToTypeID( "Chnl" );

                    var idChnl = charIDToTypeID( "Chnl" );

                    var idCmps = charIDToTypeID( "Cmps" );

                    ref3.putEnumerated( idChnl, idChnl, idCmps );

                desc7.putReference( idChnl, ref3 );

                var idInpt = charIDToTypeID( "Inpt" );

                    var list2 = new ActionList();

                    list2.putInteger( 0 );     // Black point

                    list2.putInteger( 240 );  // White point

                desc7.putList( idInpt, list2 );

                var idGmm = charIDToTypeID( "Gmm " );

                desc7.putDouble( idGmm, 1.30 );  //Gamma point

            var idLvlA = charIDToTypeID( "LvlA" );

            list1.putObject( idLvlA, desc7 );

        desc6.putList( idAdjs, list1 );

    var idLvls = charIDToTypeID( "Lvls" );

    desc5.putObject( idT, idLvls, desc6 );

executeAction( idsetd, desc5, DialogModes.NO );

DBarranca
DBarranca
Legend
October 11, 2013

As a side note to the other answers, it's true that ScriptingListener sometimes misses to record the ActionManager code relative to changes into an Adjustment Layer.

Sometimes not.

Sometimes you've to make active a different layer in order for SL to output something. Sometimes you reboot and it works the first go.

(At least that's what I remember from when I had to deal with such things)

Davide

www.davidebarranca.com

J
jakebendAuthor
Participating Frequently
October 11, 2013

Davide,

That's interesting information. I'll try rebooting.

DBarranca
DBarrancaCorrect answer
Legend
October 11, 2013

Another route could be this function that lets you specify inputWhite, inputBlack, gamma, outputWhite, outputBlack

setLevelAdj = function(inBlack, inWhite, gamma, outBlack, outWhite) {
  var d, d1, d2, l, l1, l2, r, r1, s2t;
  if (outBlack == null) {
    outBlack = 0;
  }
  if (outWhite == null) {
    outWhite = 255;
  }
  s2t = function(s) {
    return app.stringIDToTypeID(s);
  };
  d = new ActionDescriptor();
  r = new ActionReference();
  r.putEnumerated(s2t('adjustmentLayer'), s2t('ordinal'), s2t('targetEnum'));
  d.putReference(s2t('target'), r);
  d1 = new ActionDescriptor();
  d1.putEnumerated(s2t('presetKind'), s2t('presetKindType'), s2t('presetKindCustom'));
  l = new ActionList();
  d2 = new ActionDescriptor();
  r1 = new ActionReference();
  r1.putEnumerated(s2t('channel'), s2t('channel'), s2t('composite'));
  d2.putReference(s2t('channel'), r1);
  l1 = new ActionList();
  l1.putInteger(inBlack);
  l1.putInteger(inWhite);
  d2.putList(s2t('input'), l1);
  d2.putDouble(s2t('gamma'), gamma);
  l2 = new ActionList();
  l2.putInteger(outBlack);
  l2.putInteger(outWhite);
  d2.putList(s2t('output'), l2);
  l.putObject(s2t('levelsAdjustment'), d2);
  d1.putList(s2t('adjustment'), l);
  d.putObject(s2t('to'), s2t('levels'), d1);
  return executeAction(s2t('set'), d, DialogModes.NO);
};

Davide

    c.pfaffenbichler
    Community Expert
    c.pfaffenbichlerCommunity Expert
    Community Expert
    October 11, 2013

    Why, what are you trying to achieve exactly?

     

    Edit: To get an idea about the complexity of evaluating the values in an existing Adjustment Layer (Curves in this case, though) check out: curveAdjustmentToACV

      J
      jakebendAuthor
      Participating Frequently
      October 11, 2013

      I need to make a non-destructive level adjustment to multiple layers in a specific layerset. The reason for scripting it is because it's part of a toolset for performing specific (repetative) mathematical adjustments to images. It's all part of a toolset I'm developing for physically conservative rendering techniques.

      The hacky workaround I'm using is to use Applescript to invoke a PS action that makes the adjustment I need, but I hate this solution.

      I could theoretically use curves instead of levels, but part of the adjustment is going from gamma to linear space (but still working in sRGB). That would mean I'd either need to set up a more complicated curve, or add an additional "exposure" adjustment layer. That's why I'm hoping to keep the levels adjustment layer.

      I haven't quite digested the information in that curves example. I'll look into it.

      M
      Michael_L_Hale
      Inspiring
      October 11, 2013

      The problem with both levels and curve adjustment layers is the settings are stored in a format that is not easy to read. Of the two levels is easier so if levels does all you need I would stick that using levels.

      Are you willing to use something that only works for RGB documents? Will just the master settings be enough or do you need to set each channel. Do you have any idea of how you would like the data from the setting stored. A large group of variables, an Array, or a custom object?

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