We compare the new still-image compression standard,
JPEG2000, with two competing algorithms based on the Wavelet Difference
Reduction (WDR) technique of encoding.  Our comparison shows that
these WDR methods provide far simpler encoding while also providing
essentially the same performance as JPEG2000 at moderately high to very high
compression ratios.  They provide useful
alternative algorithms for applications where high compression ratios are
needed and/or further processing of the compressed images is needed.