Custom icon saving script is exporting PNGs at HUGE sizes?

Hello, I have a script which saves icons out at various sizes, the problem being is that there is odd behavior exhibited, such as:

A 22px by 22px png at 72dpi with a file size of 12.5Mb

Clearly there is some metadata or some such which must account for the inflated size. There just is not enough "physical" data there to generate that size. The other explanation is that my script is just all jacked up. If anyone could take a look and maybe see where I have gone wrong, I would appreciate it.

Entire .jsx:

#target 'photoshop'

//Array of desired resolutions

var resolutions = [1024, 912, 512, 152, 120, 114, 80, 76, 58, 50, 44, 40, 29, 25, 22];

//Variable reference to the current opened photoshop file

var doc = app.activeDocument;

var docPath = File(app.activeDocument.path + '/' + app.activeDocument.name);

//Create the GUI window

var appWindow = new Window('dialog', 'Icon Processor (ver. 1.0)');

//Styling the window

//Size (must use an window.onShow(){}; callback

appWindow.onShow = function(){appWindow.size = 'width: 230, height: 300';}

//The Create Directory input

var createDir = appWindow.add('statictext',undefined,'Create Folder Name:');

//Input textfield

var dirNameInpt = appWindow.add('edittext',undefined,undefined);

dirNameInpt.characters = 20;

dirNameInpt.active = true;

//var dirName = dirNameInpt.text;

//The Create Directory input

var createFile = appWindow.add('statictext',undefined,'Enter File Name:');

//Input textfield

var fNameInpt = appWindow.add('edittext',undefined,undefined);

fNameInpt.characters = 20;

//var fileName = fNameInpt.text;

//The execute button

var execBtn = appWindow.add('button',undefined,'Execute');

execBtn.onClick = function()

{

//Loop through the array of resolutions

for(var i=0; i<resolutions.length; i++)

{

//Resize the image by each resolution in the array set dpi to 72

doc.resizeImage(UnitValue(resolutions, 'px'), UnitValue(resolutions, 'px'), 72, ResampleMethod.BICUBIC, 100);

//Call the export PNG function for each resolution pass in the doc and name of the file as parameters

exPNG24(fNameInpt.text, dirNameInpt.text, resolutions);

            closeFile();

            openFile();

}

        //Close the application window

        appWindow.close();

};

//Close button

    var closeBtn = appWindow.add('button',undefined,'Cancel');

    closeBtn.onClick = function()

    {

        appWindow.close();

    };

//Display the window

appWindow.show();

function closeFile()

{

    app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);

}

function openFile()

{

    app.open(docPath);

    doc = app.activeDocument;

}

function exPNG24(f,d,i)

    {

        var name = f;

var directory = d;

var i = i;

        //Write a new file appending the file name with the resolution of the image

        var folder = new Folder(doc.path + '/' + directory);

        if(!folder.exists);

        folder.create();

        var file = new File(folder + '/' + name + '_' + i + '.png');

        //These are the options for saving the PNGs

        var options = new PNGSaveOptions();

        options.format = SaveDocumentType.PNG;

        //Use PNG-24

        options.PNG8 = false;

        //Preserve transparency

        options.transparency = true;

        options.interlaced = false;

        options.embedColorProfile = false;

        //Maximum quality and medium compression to keep file size low

        options.quality = 100;

        options.compression = 5;

        //remove meta data

        doc.info = null;

        //Save the image

        doc.saveAs(file, options, true, Extension.LOWERCASE);

       // doc.exportDocument(file, ExportType.SAVEFORWEB, options);

    }

//This doesn't work yet but not important as the window can be manually closed by pressing 'cancel'

appWindow.close();