count pixels?

[ancesu]

I'm new to scripting and find it so confusing. i was wondering if anybody here would know where i could find a script for exporting histogram information? basically, i have hundreds of files with 30+ layers in each file. i need to know how many pixels are present on each layer. manually, i would do this by selecting each layer and check the pixels in the selected layer in the histogram palette and write it down. if, instead, i could export this info to either a database or word file, that would save me loads of time. i'm working on with CS2. thankful for any help!

[Paul Riggott · Accepted solution]

You could try this, it will write the layer name and pixel count to a csv on the desktop with the same name as the open document.

if(documents.length){
doc=activeDocument;
var area = activeDocument.histogram;
var Results=[];
var Name = app.activeDocument.name.replace(/\.[^\.]+$/, '');
var CSV=File("~/desktop/"+Name+".csv");
findLayers(doc);
Results = Results.reverse();
CSV.open("w");
for(var a in Results){
CSV.writeln(Results[0]+","+Results[1]);
 }
CSV.close();
}
function findLayers(obj){ 
 if(obj.artLayers.length>0){
 for(var z = 0;z<obj.artLayers.length;z++){
  if(obj.artLayers.kind == LayerKind.NORMAL) {
   if(!obj.artLayers.isBackgroundLayer){
   activeDocument.activeLayer=obj.artLayers;
   loadSelection();
   if(hasSelection ()){
   Results.push([[activeDocument.activeLayer.name],[Histogram(activeDocument.histogram)]]);
   activeDocument.selection.deselect();
   }else{
    Results.push([[activeDocument.activeLayer.name],[0]]);
    }
   }
   }
  }
 }
 if(obj.layerSets.length > 0){ 
  for(var l=0;l<obj.layerSets.length;l++){
    findLayers(obj.layerSets);
   }
  }
}
function Histogram(hist) { 
   var cnt = 0; 
   for (var i = 0; i < hist.length; i++) { 
     cnt += hist; 
   } 
   return cnt; 
}
function loadSelection() {
  function cTID(s) { return app.charIDToTypeID(s); };
  function sTID(s) { return app.stringIDToTypeID(s); };
    var desc57 = new ActionDescriptor();
        var ref27 = new ActionReference();
        ref27.putProperty( cTID('Chnl'), cTID('fsel') );
    desc57.putReference( cTID('null'), ref27 );
        var ref28 = new ActionReference();
        ref28.putEnumerated( cTID('Chnl'), cTID('Chnl'), cTID('Trsp') );
    desc57.putReference( cTID('T   '), ref28 );
    executeAction( cTID('setd'), desc57, DialogModes.NO );
};
function hasSelection (doc) { 
if(doc == undefined) doc = activeDocument;
  var res = false; 
  var as = doc.activeHistoryState; 
  doc.selection.deselect(); 
  if (as != doc.activeHistoryState) { 
    res = true; 
    doc.activeHistoryState = as; 
  } 
  return res; 
};

[ancesu]

Thank you, Paul! I appreciate your help and the time you took out to do this. I received an error while running the script, but this will definitely give me a headstart! Thanks again.

[Michael_L_Hale]

There is one typo, Paul must have pressed the space bar when the cursor was in the wrong place.

Results.push([[activeDocument.activeLayer.name],[Histogram(activeDocument.histogram)]]);

Edit: Maybe Paul didn't make the typo, the forum seems to be inserting the space in histogram

[ancesu]

You guys are great! This worked. Thank you so much. You have literally saved me thousands of hours, I'm sure!