Having trouble extracting the pixel dimensions of an image link in Indesign

// Select an image (NOT its frame) then run script.
var image = app.activeDocument.selection[0];
var hs = image.horizontalScale;
var vs = image.verticalScale;
var ppi = image.actualPpi;
var gb = image.geometricBounds;
var pixelsWide = Math.round((gb[3] - gb[1]) / (hs / 100) * ppi[0]);
var pixelsHigh = Math.round((gb[2] - gb[0]) / (vs / 100) * ppi[1]);
alert([pixelsWide, pixelsHigh]);

Some notes: flopped images will give negative results. Use Math.abs() on the results.

Also doesn't work for rotated images. For that, duplicate and clear rotation, take the measurment, then remove the duplicate.

I ran into this when wanting to add "pixel dimensions" to my script "Links Report." (https://www.marspremedia.com/software/indesign/links-report)

Not only rotated, but sheared throws it off, too, of course. I'll post here the function I came up with to handle both. For these cases I opted to make a new temp doc instead of duplicate the image in the current doc. I did this because I didn't want the dupe and clear showing in the undo menu of the target document. Here's my function...

function getPixelDimensions(image) {
    var gb; //  geometricBounds
    var h; //   height
    var hs; //  horizontalScale
    var ppi; // pixels per inch
    var td; //  temp document
    var tr; //  temp rectangle
    var tg; //  temp graphic
    var vs; //  verticalScale
    var w; //   width

    ppi = image.actualPpi;
    hs = image.horizontalScale;
    vs = image.verticalScale;
    if (image.rotationAngle !== 0 || image.shearAngle !== 0) {
        // Won't be correct if rotated or sheared.
        // Copy to a temp doc and clear rotation and shear.
        // Then measure, and dump the temp doc.
        td = app.documents.add();
        tr = image.parent.duplicate(td.pages[0]);
        tg = tr.graphics[0];
        tg.rotationAngle = 0;
        tg.shearAngle = 0;
        gb = tg.geometricBounds;
        td.close(SaveOptions.NO);
    } else {
        gb = image.geometricBounds;
    }
    w = Math.abs(Math.round((gb[3] - gb[1]) / (hs / 100) * ppi[0]));
    h = Math.abs(Math.round((gb[2] - gb[0]) / (vs / 100) * ppi[1]));
    return [w, h];
    // Returns array of two numbers, width and height.
    // Width = array[0], height = array[1]
}

Hi Peter,

If the result is needed in pixels you can easily set the mesurementunits of scriptpreferences to the desired unit. See the modified script that will get the height and width in pixels

app.scriptPreferences.measurementUnit = MeasurementUnits.PIXELS
var image = app.documents[0].links[0].parent
image.clearTransformations()
var width = image.visibleBounds[3] - image.visibleBounds[1]
var height = image.visibleBounds[2] - image.visibleBounds[0]
app.documents[0].undo()

-Manan

Are you trying to get the actual (unscaled) pixel dimensions? An image has the effective ppi resolution property, so if the document units are set to inches, you can get the pixel dimensions. This gets the actual pixel (or inch) dimensions of a selected image:

var doc = app.activeDocument;
doc.viewPreferences.properties = {horizontalMeasurementUnits:MeasurementUnits.INCHES, verticalMeasurementUnits:MeasurementUnits.INCHES}

//a selected image
var sel = doc.selection[0];

//the actual pixel dimensions
$.writeln("Pixel Dimensions: " + getPixels(sel))
//returns Pixel Dimensions: 1920,1280

//the actual dimension in inches
var appi = sel.actualPpi
var aw = getPixels(sel)[0]/appi[0];
var ah = getPixels(sel)[1]/appi[1];
$.writeln("Actual Inch Dimensions: " + aw + " x " + ah)

/**
* returns the pixel dimensions of an image
* @param i an image 
*/
function getPixels(i){

    var r = i.effectivePpi;
    var w = i.geometricBounds[3] - i.geometricBounds[1];
    var h = i.geometricBounds[2] - i.geometricBounds[0];
    var hpd = Math.round(w * (r[0]));
    var vpd = Math.round(h * (r[1]));

    return [hpd, vpd];
}

Hi Peter,

There seems to be no direct property that provides the actual dimensions of the placed image, also reading the xmp would work only if you can make sure that the data is added into it correctly in the first place. I tried to put together a few lines of code that should do the trick, the idea is to clear any transformations applied to the image, use visual bounds property to calculate the height and width and then reverting the tranformation clear operation.

var image = app.documents[0].links[0].parent
image.clearTransformations()
var width = image.visibleBounds[3] - image.visibleBounds[1]
var height = image.visibleBounds[2] - image.visibleBounds[0]
app.documents[0].undo()

I have used just the first link of the document, you can add in the logic to loop ovver every link

-Manan