Methods for encoding and decoding images and computer-readable media

Abstract

The invention relates to a method for decoding and encoding images and a means of being readable by a computer. This image decoding method includes: determining whether color reproduction mode is supported for the current tonal range in the image; sampling the range corresponding to the current tonal range to respond to the determination that color reproduction mode is supported for the current tonal range; and acquiring correlation information for color reproduction mode based on a predefined reference region. and predict the current luminance by applying this correlation information to the luminance of the sample taken down.