Set artboard size not the same as exported size

[ellipirelli]

Hi,

I have a script that changes the size of the artboard and the contents on the artboard and then exports it, but I noticed the exported png is off by a few pixel.

var mm          = 2.834645;
var px          = 1;
var doc         = app.activeDocument;
var preffix     = "";
var suffix      = "";
var foldername  = "Icons"
var filepreffix = "Icon"
fullDocName = doc.fullName;

if (app.documents.length > 0) {
    // PNG
    var optionsPNG24 = new ExportOptionsPNG24();
    optionsPNG24.saveAsHTML = true;
    optionsPNG24.antiAliasing = true;
    optionsPNG24.resolution = 72;
    optionsPNG24.transparency = true;
    var type = ExportType.PNG24; 

    app.executeMenuCommand('doc-color-rgb');
    doc.artboards[0].artboardRect = [0, 171*px, 307*px, 0];

    try {
        var norm = doc.layers.getByName("Elemente");
        if (norm) {
            norm.locked = false;
            app.activeDocument.layers["Elemente"].hasSelectedArtwork = true;
            app.executeMenuCommand("group");
            var normobj = norm.pageItems[0];
            var heightTo = 135*px;
            var scale = heightTo * 100 / normobj.height;
            normobj.resize(scale, scale);
            normobj.position = [0*mm, 0*mm];  

            var ab = doc.artboards[doc.artboards.getActiveArtboardIndex()];
            var artboardRight   = ab.artboardRect[2];
            var artboardBottom  = ab.artboardRect[3];
            var myPageItem      = doc.pageItems[0];
            var horziontalCenterPosition    = (artboardRight - myPageItem.width)/2;
            var verticalCenterPosition      = (artboardBottom + myPageItem.height)/.89;
            myPageItem.position = [horziontalCenterPosition, verticalCenterPosition];
        }
    } catch (e) {}

    try {
        var rect = doc.layers.getByName("Ebene 2");
        if (rect) {
            rect.locked = false;
            rect.pathItems[0].strokeWidth = 4;
            rect.locked = false;
            var rectobj = rect.pathItems[0];
            var widthTo = 307*px;
            var scale = widthTo * 100 / rectobj.width;
            rectobj.resize(scale, scale);
            rectobj.position = [0*mm, 171*px];  
        }
    } catch (e) {}

    var param = doc.name.split('.');
    realDocName = param[0];

    file = preffix+filepreffix+realDocName+'_og'+suffix;
    folder = preffix+foldername;

    var f = new Folder(doc.path + "/" + folder);
        if (!f.exists)
        f.create();
    var saveName = new File ( f + "/" + file );
    doc.exportFile(saveName, type, optionsPNG24);
    doc.close(SaveOptions.DONOTSAVECHANGES);
    doc = null;
    app.open (fullDocName);
    doc = app.activeDocument;
}

[CarlosCanto]

by default, your PNG is clipped to the Art bounds. If you want to export the whole artboard, you have to use the below property

optionsPNG24.artBoardClipping = true;