Check if artLayer has color in it ?

[Dariusz1989]

Hey

I load in photoshop 20 layers. As I load them I'd like to check if a layer has any RGB value or its just pure black, I guess it could be done via levels but not sure.

In any case how can I check if active layer has a color value in it? Then if there is just black I can just delete the layer.

I guess I would also like to check if newly created channel with color in it also has data in it.. I know if its black and when I try to CTRL+Click to select I will get a warning that channel is empty and nothing can be selected... I guess is how can I capture that check and get a true/false result out of it.

Regards

Dariusz

Message was edited by: Dariusz Makowski

[natrev]

Hi Dariusz,

Try this Code..

Special thanks to c.pfaffenbichler​

-yajiv

#target "photoshop"

$.level=2;

function GetLayerValue(CHN){

    var myDocument = app.activeDocument;

    var theHistograms = new Array;

    var theResults = new Array;

    for (var m = 0; m < CHN; m++) {

        var thisHisto = myDocument.channels[m].histogram;

        var theCheck = false;

        var theNumber = 0;

        // check for the first non-zero value;

        while (theCheck == false) {

            if (thisHisto[theNumber] > 0) {

            theCheck = true;

            var thisNumber = (255 - theNumber) * 100 / 255;

            theResults.push (Math.round(thisNumber));

        };

        theNumber++

        };

        theHistograms.push(myDocument.channels[m].histogram);

    };

    return theResults;

}

var docRef = app.activeDocument;

var layerRef = docRef.artLayers;

var theNumber = docRef.layers.length-1;

  for (var m = theNumber; m >= 0;m--){

      LayerVisible(docRef);

      var theLayer = docRef.layers[m];

      if (theLayer.typename == "ArtLayer"){

        theLayer.visible=true;

        if (app.activeDocument.mode == DocumentMode.CMYK) {

            var Colvalue= GetLayerValue(4)

            theLayer.visible=false;

            alert("Alert!\nLayer Name : "+theLayer.name +"\nColor value  : "+Colvalue);

            if(Colvalue[0]==0 && Colvalue[1]==0 && Colvalue[2]==0 && Colvalue[3]>0){

                alert(theLayer.name +" layer have pure black value");

            }

        }

        if (app.activeDocument.mode == DocumentMode.RGB) {

            var Colvalue= GetLayerValue(3);

            theLayer.visible=false;

            alert("Alert!\nLayer Name : "+theLayer.name +"\nColor value  : "+Colvalue);

            if(Colvalue[0]==0 && Colvalue[1]==0 && Colvalue[2]==0){

                alert(theLayer.name +" layer have pure black value");

            }

        }

    }

}

function LayerVisible(docRef){

    var l=docRef.layers.length

    while(l--){

        docRef.artLayers.visible=false;

    }

}