You seem to be using Action Manager code to do a Select Color Range. The IMO that would not only select the background it would also select areas in the image that have color in the same color range as the background. You may be better off using the magic want set to contiguous and sampling a few areas near the canvas left and right bounds. You could also do that for a layer stack to try to clear each layers background to trim to the layers object.
try { if(app.documents.length>0){ app.activeDocument.suspendHistory ('Trim Layers', 'TrimLayers();') } }
catch(e) { alert( e + ': on line ' + e.line );}
function TrimLayers() {
var orig_ruler_units = app.preferences.rulerUnits; // save user ruler units
var orig_display_dialogs = app.displayDialogs; // Save users Display Doalogs
app.preferences.rulerUnits = Units.PIXELS; // set the ruler units to PIXELS
app.displayDialogs = DialogModes.NO; // Set Dialogs off
var doc = app.activeDocument; // get current document
var saveactiveLayer = doc.activeLayer; // save activeLayer
doc.selection.deselect(); // make sure ther is no active selection
try {processArtLayers(doc);} // Process all Layers
catch(e) { alert( e + ': on line ' + e.line );} // some unexpected error
doc.selection.deselect(); // make sure ther is no active selection
try { doc.activeLayer = saveactiveLayer;} // restore activeLayer
catch(e) { } // may have been deleted
app.displayDialogs = orig_display_dialogs; // Reset display dialogs
app.preferences.rulerUnits = orig_ruler_units; // reset units to original settings
}
///////////////////////////////////////////////////////////////////////////////
// Function: processsArtLayers
// Input: document or layer set
///////////////////////////////////////////////////////////////////////////////
function processArtLayers(obj) {
for(var i = obj.artLayers.length-1;0<= i; i--) { // for Layers
try {TrimLayer(obj.artLayers); } // process Art Layer
catch(e) {} // don't stop on errors
}
for(var i=obj.layerSets.length-1;0<=i;i--) { // for Layer sets
try {processArtLayers(obj.layerSets);} // process Layer Set
catch(e) {} // don't stop on errors
}
}
function TrimLayer(layer) {
// do nothing if layer is background or locked
if(layer.isBackgroundLayer || layer.allLocked || layer.pixelsLocked || layer.positionLocked || layer.transparentPixelsLocked ) return;
//if(layer.protectArtboardAutonest ) return;
if( layer.kind != LayerKind.NORMAL) return; // do nothing if not normal layer
app.activeDocument.activeLayer = layer; // target layer
var bounds = layer.bounds; // layer bounds
var LWidth = bounds[2]-bounds[0]; // layer width
var LHeight = bounds[3]-bounds[1]; // layer height
var Lleft = bounds[0]; // layer left x
var Lright = bounds[2]; // layer right x
var Ltop = bounds[1]; // layer top y
var Lbottom = bounds[3]; // layer bottom y
var tlrnc = 20; // tolerance
i=0.6; // fudge factor
try {
MagicWand((Lleft+i), (Ltop+i), tlrnc); // top left
app.activeDocument.selection.clear(); // clear
}
catch(e) {}; // do nothing
try {
MagicWand((Lleft+LWidth/2), (Ltop+i), tlrnc); // top middle
app.activeDocument.selection.clear(); // clear
}
catch(e) {}; // do nothing
try {
MagicWand((Lright-i), (Ltop+i), tlrnc); // top right
app.activeDocument.selection.clear(); // clear
}
catch(e) {}; // do nothing
try {
MagicWand((Lleft+i), (Ltop+LHeight/2), tlrnc); // middle left
app.activeDocument.selection.clear(); // clear
}
catch(e) {}; // do nothing
try {
MagicWand((Lright-i), (Ltop+LHeight/2), tlrnc); // middle right
app.activeDocument.selection.clear(); // clear
}
catch(e) {}; // do nothing
try {
MagicWand((Lleft+i), (Lbottom-i), tlrnc); // bottom left
app.activeDocument.selection.clear(); // clear
}
catch(e) {}; // do nothing
try {
MagicWand((Lleft+LWidth/2), (Lbottom-i), tlrnc); // bottom middle
app.activeDocument.selection.clear(); // clear
}
catch(e) {}; // do nothing
try {
MagicWand((Lright-i), (Lbottom-i), tlrnc); // bottom right
app.activeDocument.selection.clear(); // clear
}
catch(e) {}; // do nothing
}
function MagicWand(x,y,tolerance) {
var idsetd = charIDToTypeID( "setd" );
var desc106 = new ActionDescriptor();
var idnull = charIDToTypeID( "null" );
var ref60 = new ActionReference();
var idChnl = charIDToTypeID( "Chnl" );
var idfsel = charIDToTypeID( "fsel" );
ref60.putProperty( idChnl, idfsel );
desc106.putReference( idnull, ref60 );
var idT = charIDToTypeID( "T " );
var desc107 = new ActionDescriptor();
var idHrzn = charIDToTypeID( "Hrzn" );
var idPxl = charIDToTypeID( "#Pxl" );
desc107.putUnitDouble( idHrzn, idPxl, x );
var idVrtc = charIDToTypeID( "Vrtc" );
var idPxl = charIDToTypeID( "#Pxl" );
desc107.putUnitDouble( idVrtc, idPxl, y );
var idPnt = charIDToTypeID( "Pnt " );
desc106.putObject( idT, idPnt, desc107 );
var idTlrn = charIDToTypeID( "Tlrn" );
desc106.putInteger( idTlrn, tolerance );
var idAntA = charIDToTypeID( "AntA" );
desc106.putBoolean( idAntA, true );
executeAction( idsetd, desc106, DialogModes.NO );
}
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