Selezionare Sampled Colors

You can try this method.

Works in CC2018, but for some reason it does not work in CS6.

The method is based on creating and using a temporary preset file for the Color Range.

var c = new SolidColor();
//c.lab.l = 1;
//c.lab.a = 2;
//c.lab.b = 3;
color_range(c, 50, true);
/////////////////////////////////////////////////////////////////////////////////////
function color_range(color, fzns, dlg)
    {
    var file = new File(Folder.temp.fsName + "\\" + "_TMP_");
    try {
        var l = Math.round(0x8000 * color.lab.l/100);            
        var a = Math.round(0x4000 + color.lab.a*128);            
        var b = Math.round(0x4000 + color.lab.b*128);            
        var f = Math.round(fzns*128.5);
        var l_min = l;
        var l_max = l;
        var a_min = a;
        var a_max = a;
        var b_min = b;
        var b_max = b;
        var data = word(2) + word(6) + // something like the type and version of the file
            dword(l_min) + dword(l_max) + 
            dword(a_min) + dword(a_max) + 
            dword(b_min) + dword(b_max) +
            dword(f) + 
            dword(0) + dword(0) + dword(0);
        file.open("w");
        file.encoding = "BINARY";
        file.write(data);
        file.close();
        var d = new ActionDescriptor();
        d.putPath(stringIDToTypeID("using"), file);
        executeAction(stringIDToTypeID("colorRange"), d, dlg?DialogModes.ALL:DialogModes.NO);
        }
    catch(e) { throw(e); }
    file.remove();
    function word(r)
        {
        var r1 = r%256;
        var r2 = ((r - r1)/256)%256;
        return String.fromCharCode(r2, r1);
        }
    function dword(r)
        {
        var r1 = r%256;
        var r2 = ((r - r1)/256)%256;
        var r3 = ((r - r1 - r2*256)/(256*256))%256;
        var r4 = ((r - r1 - r2*256 - r3*256*256)/(256*256*256))%256;
        return String.fromCharCode(r4, r3, r2, r1);
        }
    }