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There are times when only documents of 72PPI will work.

But this seems as part of analysis.

The code I provided will change the document to 72PPI if was anything else then change it back to what it was originaly.

In your case, I think you just need.

[CODE]#target photoshop;

var doc = activeDocument;

var res = doc.resolution;

//change to 72 PPI

if(doc.resolution != 72) doc.resizeImage(undefined, undefined, 72, ResampleMethod.NONE);

[/CODE]

You are setting the size then trying to record the measurments without making any?

Here is the first bit of your code..

[CODE]

function setMeasurementScale() {

var desc8 = new ActionDescriptor();

var ref4 = new ActionReference();

ref4.putProperty( charIDToTypeID('Prpr'), stringIDToTypeID('measurementScale') );

ref4.putEnumerated( charIDToTypeID('Dcmn'), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );

desc8.putReference( charIDToTypeID('null'), ref4 );

var desc9 = new ActionDescriptor();

desc9.putString( charIDToTypeID('Nm  '), '85px_to_3cm' );

desc9.putInteger( stringIDToTypeID('pixelLength'), 85 );

desc9.putDouble( stringIDToTypeID('logicalLength'), 3.000000 );

desc9.putString( stringIDToTypeID('logicalUnits'), 'cm' );

desc8.putObject( charIDToTypeID('T   '), stringIDToTypeID('measurementScale'), desc9 );

executeAction( charIDToTypeID('setd'), desc8, DialogModes.NO );

};

[/CODE]

And the second bit.

[CODE]

function recordMeasurements() {

var desc10 = new ActionDescriptor();

desc10.putEnumerated( charIDToTypeID('Srce'), stringIDToTypeID('measurementSource'), charIDToTypeID('fsel') );

var list1 = new ActionList();

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Angle') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Area') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Circularity') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Count') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('DateTime') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Document') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('GrayValueMaximum') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('GrayValueMean') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('GrayValueMedian') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('GrayValueMinimum') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Height') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Histogram') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('IntegratedDensity') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Label') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Length') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Perimeter') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Scale') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('ScaleFactor') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('ScaleUnits') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Source') );

list1.putEnumerated( stringIDToTypeID('measurementDataPoint'), stringIDToTypeID('Width') );

desc10.putList( stringIDToTypeID('dataPoints'), list1 );

executeAction( stringIDToTypeID('recordMeasurements'), desc10, DialogModes.NO );

};

[/CODE]

By the way a selection is not modal so yes you can make changes.