BPG (Better Portable Graphics, http://bellard.org/bpg/) is a new image format. Its purpose is to replace the JPEG image format when quality or file size is an issue. Its main advantages are:
High compression ratio. Files are much smaller than JPEG for similar quality.
Based on a subset of the HEVC open video compression standard.
Supports the same chroma formats as JPEG (grayscale, YCbCr 4:2:0, 4:2:2, 4:4:4) to reduce the losses during the conversion. An alpha channel is supported. The RGB, YCgCo and CMYK color spaces are also supported.
Native support of 8 to 14 bits per channel for a higher dynamic range.
Lossless compression is supported.
Various meta data (such as EXIF) can be included.
I think that this format would save maintenance costs, speed, in addition to improving the quality of the images of commons.