<!--
{
  "availability" : [

  ],
  "documentType" : "symbol",
  "framework" : "quicktime-file-format",
  "identifier" : "/documentation/quicktime-file-format/Preview_atom/Atom_type",
  "metadataVersion" : "0.1.0",
  "role" : "Data field",
  "symbol" : {
    "kind" : "Data field",
    "modules" : [
      "QuickTime File Format"
    ],
    "preciseIdentifier" : "__docc_universal_symbol_reference_$Preview_atom_Atom_type"
  },
  "title" : "Atom type"
}
-->

# Atom type

A 32-bit integer that indicates the type of atom that contains the preview data.

## Overview

Typically, this is set to `'PICT'` to indicate a QuickDraw picture.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)