# JPEG XT Image Compression with Hue Compensation for Two-Layer HDR Coding

## TL;DR

This paper introduces a hue compensation technique for JPEG XT HDR image compression that reduces color distortion while maintaining standard compatibility, improving hue accuracy and luminance mapping.

## Contribution

It presents a novel hue compensation method based on maximally saturated colors that enhances color fidelity in JPEG XT HDR images without standard incompatibility.

## Key findings

- Reduces hue distortion in LDR images from JPEG XT bitstreams
- Maintains luminance mapping quality across different criteria
- Ensures full compatibility with JPEG XT standard

## Abstract

We propose a novel JPEG XT image compression with hue compensation for two-layer HDR coding. LDR images produced from JPEG XT bitstreams have some distortion in hue due to tone mapping operations. In order to suppress the color distortion, we apply a novel hue compensation method based on the maximally saturated colors. Moreover, the bitstreams generated by using the proposed method are fully compatible with the JPEG XT standard. In an experiment, the proposed method is demonstrated not only to produce images with small hue degradation but also to maintain well-mapped luminance, in terms of three kinds of criterion: TMQI, hue value in CIEDE2000, and the maximally saturated color on the constant-hue plane.