# Introduction

About the PREFORMA Ground Truth.

Contains description of and instructions for creating the PREFORMA Ground Truth Classes.

## Matroska (FFV1, LPCM)

[The PREFORMA Ground Truth Classes for Matroska (FFV1, LPCM)](matroska/).

## PDF/A

[About the PREFORMA Ground Truth for PDF/A](pdfa/).

## TIFF (baseline, EP, IT)

[The PREFORMA Ground Truth Classes for TIFF](tiff/).