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jsavage77
Inspiring
October 17, 2018
Answered

Determining DPI of embedded and placed images...

  • October 17, 2018
  • 1 reply
  • 1003 views

Is it possible to determine the DPI of placed and embedded images through scripting?  Even if I can only get the pixel size of the images, I can calculate the DPI based on the size - but I can't seem to find a way to access this information.

    This topic has been closed for replies.
    Correct answer Ten A

    Here is a sample code you can reference.

    alert(72/Math.abs(app.selection[0].matrix.mValueA));

    1 reply

    Ten A
    Community Expert
    Ten ACommunity ExpertCorrect answer
    Community Expert
    October 17, 2018

    Here is a sample code you can reference.

    alert(72/Math.abs(app.selection[0].matrix.mValueA));
      J
      jsavage77Author
      Inspiring
      October 18, 2018

         Worked like a charm on both embedded and placed images - thank you!  I would have never in a million years thought the matrix property would contain this.  Is there something out there documenting this?  Now I'm curious what the other matrix entries contain.

        Ten A
        Community Expert
        Ten ACommunity Expert
        Community Expert
        October 18, 2018

        You can read about affine transformation.

        Affine transformation - Wikipedia

        ...And test it your own.

        var $_affine={
          win:function(){
          var w = new Window ('dialog', "affine matrix", undefined);
          var p1 = w.add('panel',undefined,"a");
          p1.size = [100,45];
          var tx1 = p1.add('edittext',undefined,'1',{multiline:false});
          tx1.characters = 5;
          var p2 = w.add('panel',undefined,"b");
          p2.size = [100,45];
          var tx2 = p2.add('edittext',undefined,'0',{multiline:false});
          tx2.characters = 5;
          var p3 = w.add('panel',undefined,"c");
          p3.size = [100,45];
          var tx3 = p3.add('edittext',undefined,'0',{multiline:false});
          tx3.characters = 5;
          var p4 = w.add('panel',undefined,"d");
          p4.size = [100,45];
          var tx4 = p4.add('edittext',undefined,'1',{multiline:false});
          tx4.characters = 5;
          var cl = w.add('button', undefined, 'cancel', {name:'cancel'});
          var bt = w.add('button', undefined , 'apply', {name:'ok'});
          bt.onClick = function (){
          $_affine.applyTransform(tx1.text,tx2.text,tx3.text,tx4.text);
          }
          w.show();
          },
          applyTransform:function(a,b,c,d){
          var tm = new Matrix();
          tm.mValueA = Number(a);
          tm.mValueB = Number(b);
          tm.mValueC = Number(c);
          tm.mValueD = Number(d);
          tm.mValueTX = 0;
          tm.mValueTY = 0;
          //alert(tm.mValueA+tm.mValueB+tm.mValueC+tm.mValueD);
          app.selection[0].transform(tm,true,true,true,true,1);
          app.redraw();
          }
          }
        $_affine.win();

        Select object in Illustrator and run it.

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