How can I lookup the Tiff Image Compression being used on my file?

Question

I'm trying to figure out where this is stored in the file structure, I've tried a few different options, but I'm stuck. I dumped all the attributes of the file to console, but it's not there.
Latest I tried this:
app.activeDocument.TiffSaveOptions)
I could simply open up each file and do a Save As Which would show me all the settings, but it's more time consuming than writing this to text.
Also, does anyone have a recommendation for an Object Model Viewer? Is there one? I'd like to learn more about the files and structures themselves, without having to do hours of experimentation, since it can be difficult to figure out where things are nested.

Answer 1

var compression = -1; // unknown
var rex = /\<tiff:Compression\>(.+)\<\/tiff:Compression\>/;
if (app.documents.length > 0) {
  var xmp = String(app.activeDocument.xmpMetadata.rawData);
  var m = xmp.match(rex);
  if (m) {
    compression = Number(m[1]);
alert(compression);
Also, does anyone have a recommendation for an Object Model Viewer?
There is an OMV for JavaScript that comes built in to ESTK.
There is one PDF for the PS DOM and another for called the JavaScript Tools Guide.
I'd like to learn more about the files and structures themselves, without having to do hours of experimentation, since it can be difficult to figure out where things are nested.
There is a Photoshop Files Format PDF, also available on Adobe.com. I've used variants of it since the version that came out for PS6 many years ago.
But that stuff is not for the faint of heart.