Auto-Levels

var docRef = activeDocument

var a=docRef.channels[0]

// Finde Minimum

RLevel = 0
// for (RLevel = 0; RLevel <= 255; RLevel ++) { if (docRef.channels[0].histogram[RLevel]) { break; } }

// Finde Maximum

LLevel = 255
for (LLevel = 255; LLevel >= 0; LLevel --) { if (docRef.channels[0].histogram[LLevel]) { break; } }

// Auto-Levels

var idMk = charIDToTypeID( "Mk  " );
    var desc3 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref1 = new ActionReference();
        var idAdjL = charIDToTypeID( "AdjL" );
        ref1.putClass( idAdjL );
    desc3.putReference( idnull, ref1 );
    var idUsng = charIDToTypeID( "Usng" );
        var desc4 = new ActionDescriptor();
        var idNm = charIDToTypeID( "Nm  " );
        desc4.putString( idNm, "Auto-Tonwertkorrektur" );
        var idType = charIDToTypeID( "Type" );
            var desc5 = new ActionDescriptor();
            var idpresetKind = stringIDToTypeID( "presetKind" );
            var idpresetKindType = stringIDToTypeID( "presetKindType" );
            var idpresetKindDefault = stringIDToTypeID( "presetKindDefault" );
            desc5.putEnumerated( idpresetKind, idpresetKindType, idpresetKindDefault );
        var idLvls = charIDToTypeID( "Lvls" );
        desc4.putObject( idType, idLvls, desc5 );
    var idAdjL = charIDToTypeID( "AdjL" );
    desc3.putObject( idUsng, idAdjL, desc4 );
executeAction( idMk, desc3, DialogModes.NO );

var idsetd = charIDToTypeID( "setd" );
    var desc6 = 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 );
    desc6.putReference( idnull, ref2 );
    var idT = charIDToTypeID( "T   " );
        var desc7 = new ActionDescriptor();
        var idAdjs = charIDToTypeID( "Adjs" );
            var list1 = new ActionList();
                var desc8 = 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 );
                desc8.putReference( idChnl, ref3 );
                var idAuCo = charIDToTypeID( "AuCo" );
                desc8.putBoolean( idAuCo, true );
                var idBlcC = charIDToTypeID( "BlcC" );
                desc8.putDouble( idBlcC, 0.000000 );
                var idWhtC = charIDToTypeID( "WhtC" );
                desc8.putDouble( idWhtC, 0.000000 );
            var idLvlA = charIDToTypeID( "LvlA" );
            list1.putObject( idLvlA, desc8 );
        desc7.putList( idAdjs, list1 );
    var idLvls = charIDToTypeID( "Lvls" );
    desc6.putObject( idT, idLvls, desc7 );
executeAction( idsetd, desc6, DialogModes.NO );

// Stellt die Ebene in den Modus "Aufhellen"

var idsetd = charIDToTypeID( "setd" );
    var desc5 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref2 = new ActionReference();
        var idLyr = charIDToTypeID( "Lyr " );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref2.putEnumerated( idLyr, idOrdn, idTrgt );
    desc5.putReference( idnull, ref2 );
    var idT = charIDToTypeID( "T   " );
        var desc6 = new ActionDescriptor();
        var idMd = charIDToTypeID( "Md  " );
        var idBlnM = charIDToTypeID( "BlnM" );
        var idLghn = charIDToTypeID( "Lghn" );
        desc6.putEnumerated( idMd, idBlnM, idLghn );
    var idLyr = charIDToTypeID( "Lyr " );
    desc5.putObject( idT, idLyr, desc6 );
executeAction( idsetd, desc5, DialogModes.NO );

// Anti-Auto-Levels

var idMk = charIDToTypeID( "Mk  " );
    var desc9 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref4 = new ActionReference();
        var idAdjL = charIDToTypeID( "AdjL" );
        ref4.putClass( idAdjL );
    desc9.putReference( idnull, ref4 );
    var idUsng = charIDToTypeID( "Usng" );
        var desc10 = new ActionDescriptor();
        var idNm = charIDToTypeID( "Nm  " );
        desc10.putString( idNm, "Anti-Auto-Tonwertkorrektur" );
        var idType = charIDToTypeID( "Type" );
            var desc11 = new ActionDescriptor();
            var idpresetKind = stringIDToTypeID( "presetKind" );
            var idpresetKindType = stringIDToTypeID( "presetKindType" );
            var idpresetKindDefault = stringIDToTypeID( "presetKindDefault" );
            desc11.putEnumerated( idpresetKind, idpresetKindType, idpresetKindDefault );
        var idLvls = charIDToTypeID( "Lvls" );
        desc10.putObject( idType, idLvls, desc11 );
    var idAdjL = charIDToTypeID( "AdjL" );
    desc9.putObject( idUsng, idAdjL, desc10 );
executeAction( idMk, desc9, DialogModes.NO );

var idsetd = charIDToTypeID( "setd" );
    var desc12 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref5 = new ActionReference();
        var idAdjL = charIDToTypeID( "AdjL" );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref5.putEnumerated( idAdjL, idOrdn, idTrgt );
    desc12.putReference( idnull, ref5 );
    var idT = charIDToTypeID( "T   " );
        var desc13 = new ActionDescriptor();
        var idpresetKind = stringIDToTypeID( "presetKind" );
        var idpresetKindType = stringIDToTypeID( "presetKindType" );
        var idpresetKindCustom = stringIDToTypeID( "presetKindCustom" );
        desc13.putEnumerated( idpresetKind, idpresetKindType, idpresetKindCustom );
        var idAdjs = charIDToTypeID( "Adjs" );
            var list2 = new ActionList();
                var desc14 = new ActionDescriptor();
                var idChnl = charIDToTypeID( "Chnl" );
                    var ref6 = new ActionReference();
                    var idChnl = charIDToTypeID( "Chnl" );
                    var idChnl = charIDToTypeID( "Chnl" );
                    var idCmps = charIDToTypeID( "Cmps" );
                    ref6.putEnumerated( idChnl, idChnl, idCmps );
                desc14.putReference( idChnl, ref6 );
                var idOtpt = charIDToTypeID( "Otpt" );
                    var list3 = new ActionList();
                    list3.putInteger( RLevel );
                    list3.putInteger( LLevel );
                desc14.putList( idOtpt, list3 );
            var idLvlA = charIDToTypeID( "LvlA" );
            list2.putObject( idLvlA, desc14 );
        desc13.putList( idAdjs, list2 );
    var idLvls = charIDToTypeID( "Lvls" );
    desc12.putObject( idT, idLvls, desc13 );
executeAction( idsetd, desc12, DialogModes.NO );