Sort Different Background Layers types

[AG_Ps_100]

Hello everyone,

I need to do an action based on the content of a background layer.

Sometimes the background is totally white (as a result of creating a new document CTRL+N):

and sometimes the background isn't white (for example if I opened a jpg file)

what is the best way to differ between these two?

(i can do an average color of the layer but there must be a better way)

Thanks

[c.pfaffenbichler]

I think the Histogram should provide a useful approach.

[SuperMerlin]

#target photoshop  
if(documents.length){
var doc = activeDocument  
app.preferences.rulerUnits = Units.PIXELS;  
var h = doc.histogram  
var empty = false  
for (i=0;i<h.length;i++){  
    if(h == Number(doc.width*doc.height)){
        empty = true;
        break;
        }  
    }   
if (empty){
    alert("White Document");
   // doAction("ActionName","ActionSet");
    }else{
        alert("Not White Document");
        //doAction("ActionName","ActionSet");
        }
}

[c.pfaffenbichler]

And if you should be bored:

What about newly created documents that were not created with white as »Background Contents«?

If the task is determining a newly created document I wonder if other approaches (History maybe) would not make sense, too.

[SuperMerlin]

Very true!

It depends on how deep it should go, this might surfice?

#target photoshop  
if(documents.length) testColour();
function testColour(){
var doc = activeDocument  
app.preferences.rulerUnits = Units.PIXELS;  
var pixels = Number(doc.width*doc.height);
var h = doc.histogram  
if(h[0] == pixels){
alert("Solid Black Document");
// doAction("ActionName","ActionSet");
return;
}
if(h[255] == pixels ){
    alert("Solid White/Transparent Document");
// doAction("ActionName","ActionSet");
return;
}
var empty = false  
for (i=0;i<h.length;i++){  
    if(h == Number(doc.width*doc.height)){
        empty = true;
        break;
        }  
    }   
if (empty){
    alert("Solid Colour Document");
   // doAction("ActionName","ActionSet");
    }else{
        alert("Not Solid Colour Document");
        //doAction("ActionName","ActionSet");
        }
};

[Stephen_A_Marsh]

Although not directly applicable to this situation, it is worth mentioning this article with related code:

Photoshop Script – Determine Layer Kind

[c.pfaffenbichler]

AG_Ps_100 , maybe you could give more context.

What is the ultimate goal here and how does it fit in your workflow?

Because I think creating a new document could be linked to a Script or Action via Script Events Manager anyhow.