CryptoToLayered.jsx

<javascriptresource>
  <name>Cryptomatte to Layered PSD</name>
  <about>
      This will convert an exr cyrptomatte file to a layered PSD.
  		This assumes that the EXR was unpacked by EXR-IO
  		https://www.exr-io.com/
  		Evan Viera
  </about>
  <enableinfo>true</enableinfo>
  <menu>filter</menu>
  <category>Viera</category>
  <type>automate</type>
  </javascriptresource>

#include "vieraLibrary.jsx"

var doc = activeDocument;
var layerIndex = 0;
var rgbLayer;

// Collect all Cryptomatte Layers
var cryptoLayers = getAllCrypoLayers( );

// Find "RenderLayer.Combined.RGBA" and store as variable rgbLayer
// Disable the visibility for all layers. Important for the RGB to A function.

var RgbCombined = new RegExp( /Combined.RGBA/gim );

for ( var i = 0; i < doc.layers.length; i++ )
{
	if ( doc.layers[ i ].name.match( RgbCombined ) ) rgbLayer = doc.layers[ i ];
	doc.layers[ i ].visible = false;
}


// Loop Through Crypto and convert RGB to A
for ( var i = 0; i < cryptoLayers.length; i++ )
{
	var currentLayer = cryptoLayers[ i ];
	currentLayer.visible = true;

	var convertedLayer = applyCryptoToRgbLayer( currentLayer );
	convertedLayer.visible = false;
}


// Make all newly created layers visible.
for ( var i = 0; i < cryptoLayers.length; i++ ) cryptoLayers[ i ].visible = true;






/*		------------------------------------------------

		Main function.

		This will call the convert
		function that transfors RGB into the layer's
		matte. Then will duplicate the RGB layer and
		flatten it.

		------------------------------------------------
*/
function applyCryptoToRgbLayer( __cryptoLayer )
{
	doc.activeLayer = __cryptoLayer;
	convertRGBToMask();

	var rgbDuplicate = rgbLayer.duplicate( __cryptoLayer, ElementPlacement.PLACEBEFORE );
		rgbDuplicate.grouped = true;

	return rgbDuplicate.merge( );
}


/*		------------------------------------------------

		Loops through and collects all crypto layers that
		it finds via the regex expression.

		------------------------------------------------
*/
function getAllCrypoLayers( )
{
	var collectedLayers = [];
	var regEx = new RegExp( /Crypto/gim );

	for ( var i = 0; i < doc.layers.length; i++ )
	{
		var currentLayer = doc.layers[ i ];
		if ( currentLayer.name.match( regEx ) )
		{
			collectedLayers.push( currentLayer );
		}
	}

	return collectedLayers;
}