Load colour table (index color)

[Ghoul Fool]

This should be straightforward, I want to load a colour table .ACT from a script only the code from the scriptlistener explicitly looks at each RGB entry:

// =======================================================
var idCnvM = charIDToTypeID( "CnvM" );
    var desc13758 = new ActionDescriptor();
    var idT = charIDToTypeID( "T   " );
        var desc13759 = new ActionDescriptor();
        var idCstP = charIDToTypeID( "CstP" );
            var list1363 = new ActionList();
                var desc13760 = new ActionDescriptor();
                var idRd = charIDToTypeID( "Rd  " );
                desc13760.putDouble( idRd, 196.000000 );
                var idGrn = charIDToTypeID( "Grn " );
                desc13760.putDouble( idGrn, 28.000000 );
                var idBl = charIDToTypeID( "Bl  " );
                desc13760.putDouble( idBl, 56.000000 );
            var idRGBC = charIDToTypeID( "RGBC" );
            list1363.putObject( idRGBC, desc13760 );
                var desc13761 = new ActionDescriptor();
                var idRd = charIDToTypeID( "Rd  " );
                desc13761.putDouble( idRd, 96.000000 );
                var idGrn = charIDToTypeID( "Grn " );
                desc13761.putDouble( idGrn, 96.000000 );
                var idBl = charIDToTypeID( "Bl  " );
                desc13761.putDouble( idBl, 128.000000 );
            var idRGBC = charIDToTypeID( "RGBC" );
            list1363.putObject( idRGBC, desc13761 );
                var desc13762 = new ActionDescriptor();
                var idRd = charIDToTypeID( "Rd  " );
                desc13762.putDouble( idRd, 129.000000 );
                var idGrn = charIDToTypeID( "Grn " );
                desc13762.putDouble( idGrn, 127.000000 );
                var idBl = charIDToTypeID( "Bl  " );
                desc13762.putDouble( idBl, 127.000000 );
            var idRGBC = charIDToTypeID( "RGBC" );
            list1363.putObject( idRGBC, desc13762 );
                var desc13763 = new ActionDescriptor();
                var idRd = charIDToTypeID( "Rd  " );
                desc13763.putDouble( idRd, 93.000000 );
                var idGrn = charIDToTypeID( "Grn " );
                desc13763.putDouble( idGrn, 93.000000 );
                var idBl = charIDToTypeID( "Bl  " );
                desc13763.putDouble( idBl, 93.000000 );
            var idRGBC = charIDToTypeID( "RGBC" );
            list1363.putObject( idRGBC, desc13763 );
        desc13759.putList( idCstP, list1363 );
    var idIndC = charIDToTypeID( "IndC" );
    desc13758.putObject( idT, idIndC, desc13759 );
executeAction( idCnvM, desc13758, DialogModes.NO );

Not what I'm after. Also the code is very ugly, and that's only for 4 colours and is incrementally longer for more colour values.

Is there the equivilant of  this?

Image > Mode > Color Table... > Custom > Load... (pick mypalette.act) :

load_palette("C:\mypalette.act";

function load_palette(apath)
{
	// magic code here
}

.

Cheers.

[r-bin · Accepted solution]

// magic code here

look here https://community.adobe.com/t5/photoshop-ecosystem-discussions/how-do-i-export-the-color-table-act-f...

[Kukurykus]

He already knows that: second link

[r-bin]

He already knows that: second link

By Kukurykus

My link points to the specific code he(her) needs

[Kukurykus]

That's right. I mean he knew your exact post long time ago and even suggested to other user.

[Ghoul Fool]

That's expoting it. I can already do that. Trying to load an existing .act back in without having save a temporary .psd,  and get the data from it, that's something else.

[Kukurykus]

If .act loading snippet in that post is not what you look for, explain better what you mean.

[Ghoul Fool]

Sorry, I'm autistic and have trouble saying what I mean clearly to others somethimes.

Basically the equivilant of 

Image > Mode > Color Table... > Custom > Load... (pick a .ACT file)

[Kukurykus]

That snippet does it. I mean it automatically loads and sets the .act file. Show that on video?

[Ghoul Fool]

The snippet from here may work for r-bin, but it doesn't work for me in '22

var myPaletteFile = "D:\temp\4.act";
load_palette(myPaletteFile);

function load_palette(afilename)
{
   var d = new ActionDescriptor();
   var r = new ActionReference();
   r.putProperty(stringIDToTypeID("color"), stringIDToTypeID("colorTable"));
   d.putReference(stringIDToTypeID("null"), r);
   d.putPath(stringIDToTypeID("to"), new File(afilename));
   executeAction(stringIDToTypeID("set"), d, DialogModes.NO);
}

I get the error:

Error 8800: General Photoshop error occurred.
This functionality may not be available in this version of Photoshop.
The command "Set" is not currently available.
-> Line 11 executeAction(stringIDToTypeID("set"), d, DialogModes.NO)

[Kukurykus]

Have you changed to 'Edit / Mode / Indexed Color' before ran the snippet?

[Ghoul Fool]

Yes, that's what I've just figureed out. - After getting soooo confused. 😞

The code above only works if the image is indexed mode. I was hoping it would force it to load the palette and change from RGB to index mode with said palette in one go.  

That said, I've managed to get around it by changing it to index prior to loading the palette.

index_colour_it("Adpt");

function index_colour_it(palettestyle, num)
{
  // forces image to be 256 colours
  // =======================================================
  if (num == undefined) num = 256;
  if (palettestyle == undefined) palettestyle = "Perc";
  // could be "Sele" selective or 
  // "Adpt" adaptive
  // "Perc" perceptual
 
  var idCnvM = charIDToTypeID( "CnvM" );
  var desc1729 = new ActionDescriptor();
  var idT = charIDToTypeID( "T   " );
  var desc1730 = new ActionDescriptor();
  var idPlt = charIDToTypeID( "Plt " );
  var idClrP = charIDToTypeID( "ClrP" );
  var idPerc = charIDToTypeID( palettestyle ); // Stye
  desc1730.putEnumerated( idPlt, idClrP, idPerc );
  var idClrs = charIDToTypeID( "Clrs" );
  desc1730.putInteger( idClrs, num ); // number of colours
  var idFrcC = charIDToTypeID( "FrcC" );
  var idFrcC = charIDToTypeID( "FrcC" );
  var idNone = charIDToTypeID( "None" );
  desc1730.putEnumerated( idFrcC, idFrcC, idNone );
  var idTrns = charIDToTypeID( "Trns" );
  desc1730.putBoolean( idTrns, false );
  var idIndC = charIDToTypeID( "IndC" );
  desc1729.putObject( idT, idIndC, desc1730 );
  executeAction( idCnvM, desc1729, DialogModes.NO );
}

[Kukurykus]

It seems r-bin solution is correct. Fell free to mark it so 🙂