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powerful_Zephyr5EF9
Known Participant
February 7, 2025
Answered

script set contrast value

  • February 7, 2025
  • 2 replies
  • 1204 views

hi,

i use the following code to create the brightness/contrast layer

https://community.adobe.com/t5/photoshop-ecosystem-discussions/how-to-automate-photoshop-s-quot-auto-quot-brightness-contrast-functionality-on-a-batch-of-images/m-p/13890434

Code: 

// Apply auto brightness/contrast adjustment
var autoDescriptor = new ActionDescriptor();
var reference = new ActionReference();
reference.putClass(stringIDToTypeID("adjustmentLayer"));
autoDescriptor.putReference(stringIDToTypeID("null"), reference);
var typeDescriptor = new ActionDescriptor();
var brightnessDescriptor = new ActionDescriptor();
brightnessDescriptor.putBoolean(stringIDToTypeID("auto"), true);
brightnessDescriptor.putBoolean(stringIDToTypeID("useLegacy"), false);
typeDescriptor.putObject(stringIDToTypeID("type"), stringIDToTypeID("brightnessEvent"), brightnessDescriptor);
autoDescriptor.putObject(stringIDToTypeID("using"), stringIDToTypeID("adjustmentLayer"), typeDescriptor);
var resultDesc = executeAction(stringIDToTypeID("make"), autoDescriptor, DialogModes.NO);

///////////////////////

 

but the contrast value often makes the image too contrasty, i want to set the contrast value = 0,

please give me the command to do it.

 

Correct answer Ghoul Fool

Ok this it a bit of a hack, but it'll do: it will add an auto contrast adjustment layer - set the values and then set contrast to 0 regardless.

 

auto_brightness();
set_contrast_to_zero();

function auto_brightness()
{
    var d = new ActionDescriptor();
    var r = new ActionReference();
    r.putClass(stringIDToTypeID("adjustmentLayer"));
    d.putReference(stringIDToTypeID("null"), r);
    var d1 = new ActionDescriptor();
    var d2 = new ActionDescriptor();
    d2.putBoolean(stringIDToTypeID("auto"), true);
    d2.putBoolean(stringIDToTypeID("useLegacy"), false);
    d1.putObject(stringIDToTypeID("type"), stringIDToTypeID("brightnessEvent"), d2);
    d.putObject(stringIDToTypeID("using"), stringIDToTypeID("adjustmentLayer"), d1);
    executeAction(stringIDToTypeID("make"), d, DialogModes.NO);
}

function set_contrast_to_zero()
{
        // =======================================================
        var idsetd = charIDToTypeID( "setd" );
        var desc1848 = new ActionDescriptor();
        var idnull = charIDToTypeID( "null" );
        var ref354 = new ActionReference();
        var idAdjL = charIDToTypeID( "AdjL" );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref354.putEnumerated( idAdjL, idOrdn, idTrgt );
        desc1848.putReference( idnull, ref354 );
        var idT = charIDToTypeID( "T   " );
        var desc1849 = new ActionDescriptor();
        // var idBrgh = charIDToTypeID( "Brgh" );
        // desc1849.putInteger( idBrgh, 0 );
        var idCntr = charIDToTypeID( "Cntr" );
        desc1849.putInteger( idCntr, 0 );
        var iduseLegacy = stringIDToTypeID( "useLegacy" );
        desc1849.putBoolean( iduseLegacy, false );
        var idBrgC = charIDToTypeID( "BrgC" );
        desc1848.putObject( idT, idBrgC, desc1849 );
        executeAction( idsetd, desc1848, DialogModes.NO );
}

2 replies

G
Ghoul Fool
Inspiring
February 7, 2025

You can add a Brightness and Contrast adjustment layer with this function;

 

 

brightness_contrast(50, 0, false);

// function  brightnessAndContrast (brightness, contrast)
// --------------------------------------------------------
function brightness_contrast(b, c, legacy)
{
  if(legacy == undefined) legacy = false;

  // create new Brightness contrast adjustment layer
  // =======================================================
  var idMk = charIDToTypeID( "Mk  " );
  var desc834 = new ActionDescriptor();
  var idnull = charIDToTypeID( "null" );
  var ref206 = new ActionReference();
  var idAdjL = charIDToTypeID( "AdjL" );
  ref206.putClass( idAdjL );
  desc834.putReference( idnull, ref206 );
  var idUsng = charIDToTypeID( "Usng" );
  var desc835 = new ActionDescriptor();
  var idType = charIDToTypeID( "Type" );
  var desc836 = new ActionDescriptor();
  var iduseLegacy = stringIDToTypeID( "useLegacy" );
  desc836.putBoolean( iduseLegacy, false );
  var idBrgC = charIDToTypeID( "BrgC" );
  desc835.putObject( idType, idBrgC, desc836 );
  var idAdjL = charIDToTypeID( "AdjL" );
  desc834.putObject( idUsng, idAdjL, desc835 );
  executeAction( idMk, desc834, DialogModes.NO );

    // =======================================================
    var idsetd = charIDToTypeID( "setd" );
    var desc826 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
    var ref201 = new ActionReference();
    var idAdjL = charIDToTypeID( "AdjL" );
    var idOrdn = charIDToTypeID( "Ordn" );
    var idTrgt = charIDToTypeID( "Trgt" );
    ref201.putEnumerated( idAdjL, idOrdn, idTrgt );
    desc826.putReference( idnull, ref201 );
    var idT = charIDToTypeID( "T   " );
    var desc827 = new ActionDescriptor();
    var idBrgh = charIDToTypeID( "Brgh" );
    desc827.putInteger( idBrgh, b ); //brightness
    var idCntr = charIDToTypeID( "Cntr" );
    desc827.putInteger( idCntr, c ); //Contrast
    var iduseLegacy = stringIDToTypeID( "useLegacy" );
    desc827.putBoolean( iduseLegacy, legacy );
    var idBrgC = charIDToTypeID( "BrgC" );
    desc826.putObject( idT, idBrgC, desc827 );
    executeAction( idsetd, desc826, DialogModes.NO );

}

 

    P
    powerful_Zephyr5EF9Author
    Known Participant
    February 7, 2025

    thank @Ghoul Fool 

    At the moment, this code runs exactly as i want but unfortunately i dont know how to program in photoshop so this program is the result of patching together parts of code. i think it is not optimized.

     

    Goal:
    Apply auto brightness from "auto" Brightness/Contrast function in photoshop but keep only brightness value and remove contrast value.

    Step 1:
    Run the code to create "auto" brightness/contrast as default (not legacy).
    Step 2: Get brightness value and remove layer.
    Step 3: Create new Brightness/Contrast layer with brightness value obtained in step 2 and contrast value set to 0.

     

    Is there any way to set contrast value (set contrast = 0 or 1,2 ..) right after step 1?

     

    CODE:

    // STEP 1 - make Auto Brightness/contrast default
    // Apply auto brightness/contrast adjustment
        var autoDescriptor = new ActionDescriptor();
        var reference = new ActionReference();
        reference.putClass(stringIDToTypeID("adjustmentLayer"));
        autoDescriptor.putReference(stringIDToTypeID("null"), reference);
        var typeDescriptor = new ActionDescriptor();
        var brightnessDescriptor = new ActionDescriptor();
        brightnessDescriptor.putBoolean(stringIDToTypeID("auto"), true);
        brightnessDescriptor.putBoolean(stringIDToTypeID("useLegacy"), false);    
        typeDescriptor.putObject(stringIDToTypeID("type"), stringIDToTypeID("brightnessEvent"), brightnessDescriptor);
        autoDescriptor.putObject(stringIDToTypeID("using"), stringIDToTypeID("adjustmentLayer"), typeDescriptor);
        var resultDesc = executeAction(stringIDToTypeID("make"), autoDescriptor, DialogModes.NO);
        ///////////////////////////////////////////////////////////////////////////////////////////
    // idle correction change so that photoshop removes the "auto" parameter from the adjustment object.
        var d = new ActionDescriptor();
        var r = new ActionReference();
        r.putEnumerated(stringIDToTypeID("adjustmentLayer"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum"));
        d.putReference(stringIDToTypeID("null"), r);
        var data = new ActionDescriptor();
        d.putObject(stringIDToTypeID("to"), stringIDToTypeID("brightnessEvent"), data);
        executeAction(stringIDToTypeID("set"), d, DialogModes.NO);
        ///////////////////////////////////////////////////////////////////////////////////////////
        var ref = new ActionReference();
        ref.putEnumerated(charIDToTypeID('Lyr '), charIDToTypeID('Ordn'), charIDToTypeID('Trgt')); // reference is active layer
        var layerDesc = executeActionGet(ref);
        var layerID = layerDesc.getInteger(stringIDToTypeID('layerID'));
     
        // Use the function you found to get the brightness descriptor
        var brConDesc = get_contrast_desc(layerID);
     
    function get_contrast_desc(id) {
        try {
            var r = new ActionReference();
            var d = new ActionDescriptor();
     
            r.putProperty(stringIDToTypeID("property"), stringIDToTypeID("json"));
            r.putEnumerated(stringIDToTypeID("document"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum"));
            d.putReference(stringIDToTypeID("null"), r);
     
            d.putInteger(stringIDToTypeID("layerID"), id);
            d.putBoolean(stringIDToTypeID("layerInfo"), true);
     
            d.putBoolean(stringIDToTypeID( "includeAncestors" ), false);
     
            eval("var json="+executeAction(stringIDToTypeID("get"), d, DialogModes.NO).getString(stringIDToTypeID("json")));
     
            var d = new ActionDescriptor();
     
            if (!json.layers) return d;
            if (json.layers.length != 1) return d;
            if (json.layers[0].id != id) return d;
     
            var adj = json.layers[0].adjustment;
            // alert("brightness="+adj.brightness); // shows undefined, even though the active layer is a Brightness/Contrast layer
            //alert("contrast="+adj.center); // shows undefined, even though the active layer is a Brightness/Contrast layer
     
    // STEP 2 - remove first Brightness layer
    var AutoBrightness1 = app.activeDocument.artLayers.getByName("Brightness/Contrast 1");
    //AutoBrightness1.visible = false;
    AutoBrightness1.remove();
     
    // STEP 3 - Add new brightness layer with Brightness value and without Contrast value.
    brightness_contrast(adj.brightness, 0, false);
     
            if (!adj) return d;
            if (adj.brightness != undefined) d.putInteger(stringIDToTypeID("brightness"), adj.brightness);
            if (adj.center     != undefined) d.putInteger(stringIDToTypeID("center"),     adj.center);
            if (adj.useLegacy  != undefined) d.putBoolean(stringIDToTypeID("useLegacy"),  adj.useLegacy);
     
            return d;
            }
        catch (e) { throw(e); }
    }
     
     
    // function  brightnessAndContrast (brightness, contrast)
    // --------------------------------------------------------
    function brightness_contrast(b, c, legacy)
    {
      if(legacy == undefined) legacy = false;
     
      // create new Brightness contrast adjustment layer
      // =======================================================
      var idMk = charIDToTypeID( "Mk  " );
      var desc834 = new ActionDescriptor();
      var idnull = charIDToTypeID( "null" );
      var ref206 = new ActionReference();
      var idAdjL = charIDToTypeID( "AdjL" );
      ref206.putClass( idAdjL );
      desc834.putReference( idnull, ref206 );
      var idUsng = charIDToTypeID( "Usng" );
      var desc835 = new ActionDescriptor();
      var idType = charIDToTypeID( "Type" );
      var desc836 = new ActionDescriptor();
      var iduseLegacy = stringIDToTypeID( "useLegacy" );
      desc836.putBoolean( iduseLegacy, false );
      var idBrgC = charIDToTypeID( "BrgC" );
      desc835.putObject( idType, idBrgC, desc836 );
      var idAdjL = charIDToTypeID( "AdjL" );
      desc834.putObject( idUsng, idAdjL, desc835 );
      executeAction( idMk, desc834, DialogModes.NO );
     
        // =======================================================
        var idsetd = charIDToTypeID( "setd" );
        var desc826 = new ActionDescriptor();
        var idnull = charIDToTypeID( "null" );
        var ref201 = new ActionReference();
        var idAdjL = charIDToTypeID( "AdjL" );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref201.putEnumerated( idAdjL, idOrdn, idTrgt );
        desc826.putReference( idnull, ref201 );
        var idT = charIDToTypeID( "T   " );
        var desc827 = new ActionDescriptor();
        var idBrgh = charIDToTypeID( "Brgh" );
        desc827.putInteger( idBrgh, b ); //brightness
        var idCntr = charIDToTypeID( "Cntr" );
        desc827.putInteger( idCntr, c ); //Contrast
        var iduseLegacy = stringIDToTypeID( "useLegacy" );
        desc827.putBoolean( iduseLegacy, legacy );
        var idBrgC = charIDToTypeID( "BrgC" );
        desc826.putObject( idT, idBrgC, desc827 );
        executeAction( idsetd, desc826, DialogModes.NO );
    }

     

     

    P
    powerful_Zephyr5EF9Author
    Known Participant
    February 7, 2025

    Ok this it a bit of a hack, but it'll do: it will add an auto contrast adjustment layer - set the values and then set contrast to 0 regardless.

     

    auto_brightness();
set_contrast_to_zero();

function auto_brightness()
{
    var d = new ActionDescriptor();
    var r = new ActionReference();
    r.putClass(stringIDToTypeID("adjustmentLayer"));
    d.putReference(stringIDToTypeID("null"), r);
    var d1 = new ActionDescriptor();
    var d2 = new ActionDescriptor();
    d2.putBoolean(stringIDToTypeID("auto"), true);
    d2.putBoolean(stringIDToTypeID("useLegacy"), false);
    d1.putObject(stringIDToTypeID("type"), stringIDToTypeID("brightnessEvent"), d2);
    d.putObject(stringIDToTypeID("using"), stringIDToTypeID("adjustmentLayer"), d1);
    executeAction(stringIDToTypeID("make"), d, DialogModes.NO);
}

function set_contrast_to_zero()
{
        // =======================================================
        var idsetd = charIDToTypeID( "setd" );
        var desc1848 = new ActionDescriptor();
        var idnull = charIDToTypeID( "null" );
        var ref354 = new ActionReference();
        var idAdjL = charIDToTypeID( "AdjL" );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref354.putEnumerated( idAdjL, idOrdn, idTrgt );
        desc1848.putReference( idnull, ref354 );
        var idT = charIDToTypeID( "T   " );
        var desc1849 = new ActionDescriptor();
        // var idBrgh = charIDToTypeID( "Brgh" );
        // desc1849.putInteger( idBrgh, 0 );
        var idCntr = charIDToTypeID( "Cntr" );
        desc1849.putInteger( idCntr, 0 );
        var iduseLegacy = stringIDToTypeID( "useLegacy" );
        desc1849.putBoolean( iduseLegacy, false );
        var idBrgC = charIDToTypeID( "BrgC" );
        desc1848.putObject( idT, idBrgC, desc1849 );
        executeAction( idsetd, desc1848, DialogModes.NO );
}

    thank you,

    in the set_contrast function, how to get Brightness value?

    c.pfaffenbichler
    Community Expert
    c.pfaffenbichlerCommunity Expert
    Community Expert
    February 7, 2025

    Comment out the line 

    brightnessDescriptor.putBoolean(stringIDToTypeID("auto"), true);
      P
      powerful_Zephyr5EF9Author
      Known Participant
      February 7, 2025

      no, I mean just change the value of contrast = 0, but keep the value of brightness the same.

      C
      Ciccillotto
      Inspiring
      February 7, 2025

       

      From here you can adjust both the opacity and the contrast. 

      app.activeDocument.activeLayer.adjustBrightnessContrast(-20, 80);

       

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