🚀 go-pugleaf

I wonder if this is what you are looking for?
This was writtem by Mike Hale.


 
var SizeOfFile = prompt("Please Enter Size In Megabytes",48) 

if (SizeOfFile > 0) resizeToMB( SizeOfFile );  

 

function resizeToMB( size_in_MB ) {  

  var current_units = preferences.rulerUnits;  

  preferences.rulerUnits = Units.PIXELS;  

  var width_pixels = activeDocument.width;  

  var height_pixels = activeDocument.height;  

  var channel_count = activeDocument.channels.length;  

  var final_size = ( 1024 * 1024 * size_in_MB ) / channel_count;  

  var image_bytes = width_pixels * height_pixels;  

  var image_scale = Math.sqrt( final_size/ image_bytes );  

  var final_width = width_pixels * image_scale;  

  var final_height = height_pixels * image_scale;  

  var final_dpi = activeDocument.resolution;  

  if ( image_scale > 1 ) {  

    activeDocument.resizeImage( final_width, final_height, final_dpi, ResampleMethod.BICUBICSMOOTHER );  

} else {  

    activeDocument.resizeImage( final_width, final_height, final_dpi, ResampleMethod.BICUBICSHARPER );  

}  

  preferences.rulerUnits = current_units;  

}