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_Joerg_Koch_
Participating Frequently
December 31, 2008
Question

Load Transparency from a layer?

  • December 31, 2008
  • 5 replies
  • 2899 views
How can I load the transparency from a given layer as a selection via script? In the way as if you cmd-klick on a layer palette icon and have the solid pixels in that layer selected.
There is the Selection.load (from: Channel ), and in the Photoshop menue there is also the option to select the Transparency of the active channel but I can't find anything like that in the object Library.

Thanks for your help, Joerg
This topic has been closed for replies.

5 replies

M
myrslok
Inspiring
June 25, 2009

I'm trying to do the same thing and got the code working, but I would also like to specify the mode when selecting.

Specifically I would like to add the transparencys from several layers together to get their combined transparency. In other words, the equivalent of CTRL-SHIFT-Click on the layer thumbnail.

How would I do this?

thanks

Ludde

Paul Riggott
Paul Riggott
Inspiring
June 25, 2009

Give this a try....

loadTransparencyAll();

function loadTransparencyAll() {
   var desc13 = new ActionDescriptor();
        var ref10 = new ActionReference();
        ref10.putProperty( charIDToTypeID('Chnl'), charIDToTypeID('fsel') );
    desc13.putReference( charIDToTypeID('null'), ref10 );
        var ref11 = new ActionReference();
        ref11.putEnumerated( charIDToTypeID('Chnl'), charIDToTypeID('Chnl'), charIDToTypeID('Trsp') );
        ref11.putName( charIDToTypeID('Lyr '), activeDocument.artLayers[0].name );
    desc13.putReference( charIDToTypeID('T   '), ref11 );
try{
    executeAction( charIDToTypeID('setd'), desc13, DialogModes.NO );
}catch(e){}
};

Paul Riggott
Paul Riggott
Inspiring
February 5, 2009
Here is a variation on X's code
The layer must be the active one... 



selectTransparency();







function selectTransparency() {



  function cTID(s) { return app.charIDToTypeID(s); };



  function sTID(s) { return app.stringIDToTypeID(s); };



    var desc27 = new ActionDescriptor();



        var ref3 = new ActionReference();



        ref3.putProperty( cTID('Chnl'), cTID('fsel') );



    desc27.putReference( cTID('null'), ref3 );



        var ref4 = new ActionReference();



        ref4.putEnumerated( cTID('Chnl'), cTID('Chnl'), cTID('Trsp') );



    desc27.putReference( cTID('T   '), ref4 );



    executeAction( cTID('setd'), desc27, DialogModes.NO );



};
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_Jonathan_Reyes_
Participant
February 5, 2009
I'm also trying to achieve this, but i'm not sure how to use the code you gave. can you give an example? thanks
_
_Joerg_Koch_Author
Participating Frequently
January 2, 2009
Thanks a lot!
_
_xbytor_
Known Participant
December 31, 2008
From xtools/xlib/stdlib.js:

Stdlib = {}

cTID = function(s) { return app.charIDToTypeID(s); };
sTID = function(s) { return app.stringIDToTypeID(s); };


//
// Select either the Transparency or Mask Channel
// kind - "Trsp" or "Msk "
//
Stdlib.loadSelection = function(doc, layer, kind, invert) {
function _ftn() {
var desc = new ActionDescriptor(); // Set

var cref = new ActionReference(); // Channel Selection
cref.putProperty(cTID("Chnl"), cTID("fsel"));
desc.putReference(cTID("null"), cref);

var tref = new ActionReference(); // Channel Kind ("Trsp" or "Msk ")
tref.putEnumerated(cTID("Chnl"), cTID("Chnl"), cTID(kind));
desc.putReference(cTID("T "), tref);
if (invert == true) {
desc.putBoolean(cTID("Invr"), true);
}
executeAction(cTID("setd"), desc, DialogModes.NO);
}
_ftn));
};
Stdlib.selectTransparencyChannel = function(doc, layer, invert) {
Stdlib.loadSelection(doc, layer, "Trsp", invert);
};
Stdlib.selectMaskChannel = function(doc, layer, invert) {
Stdlib.loadSelection(doc, layer, "Msk ", invert);
};



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