This is a summary of the discussions of the participants at the interest group meeting during the ALA Annual Conference 2007 in Washington DC.

"What we have released is an archive of the HiRISE Experiment Data Records (EDRs) and Reduced Data Records (RDRs). EDRs are in the *.IMG file format and represent individual CCD channels (remember, there are 14 CCDs in the HiRISE camera and two channels per CCD, for a total of 28 channels). These EDRs are cleaned up, calibrated, stitched together, and mapped to Mars’ geometry, resulting in the RDR products. RDRs are in the *.JP2 and *.LBL formats. JPEG2000 is the technology that enables us to offer our gigantic images to the scientific community and the public in a timely and efficient manner. An observation’s image data are in the *.JP2 file and its meta data are in the detached *.LBL files. To view these products, JPEG2000 compatible software is required (see our site for a list of offerings)."

j2k is a free Photoshop and After Effects plug-in set for reading and writing the JPEG 2000 file format, the successor to JPEG.

Also known as JP2, JPEG 2000 uses wavelet compression as opposed to the DCT compression used in standard JPEG. The end result is better image quality in a smaller file. JP2 also includes mandatory metadata such as information about an image's color space.

The After Effects version has the ability to Auto Proxy, meaning that when working at half or quarter resolution, j2k will only need to read in a fraction of the file, resulting in dramatic speedups.

By Ian Gilmour of Media Matters. From the abstract: Motion-JPEG2000 lossless data reduction is implemented as a key technology for reducing file size in storage and for reducing data rates in networked file transfer.