The J2000 codec was written in an effort to produce the cleanest and simplest implementation possible of the JPEG-2000 standard. We have put a particular emphasis on good architecture design and code simplicity, while at the same time providing an implementation as complete and efficient as possible. The source code for the codec is freely available for anyone to study or even for use in commercial programs. We hope that our open development process and our focus on clean, straightforward code will help make the J2000 codec become a reference implementation of the JPEG-2000 standard-codec was written in an effort to p roduce the cleanest and simplest implementati on possible of the JPEG-2000 standard. We have p ut a particular emphasis on good architecture d esign and code simplicity, while at the same time providing an implementat ion as complete and efficient as possible. The s ource code for the codec is freely available for anyone to study or even for use in commercial pro grams. We hope that our open development proces 's and our focus on clean, straightforward code will help make the J2000 c odec become a reference implementation of the J PEG-2000 standard