The document discusses objective and subjective quality assessment methods for evaluating the rate-distortion performance of JPEG-XR image compression. It provides details on various objective metrics used to compare JPEG-XR to JPEG2000 and JPEG, including PSNR, SSIM, VIF, and others. It also proposes a methodology for subjective testing using a continuous quality scale to validate the results of objective metrics. Preliminary results are presented comparing different JPEG-XR implementations using the objective metrics.