charls: charls (CharLS, a C++ JPEG-LS library implementation) charls: charls: CharLS is a C++ implementation of the JPEG-LS standard for lossless charls: and near-lossless image compression and decompression. JPEG-LS is charls: a low-complexity image compression standard that matches JPEG 2000 charls: compression ratios. charls: charls: charls: charls: charls: