It is my understanding that PhaseOne cameras can produce 2 IIQ formats: S (for small) and L (for Large). Right now I m only able to use libraw with IIQ L image. Do you have any plan to make the S format compatible ? I think I can provide you a sample if required.
The following is taken from the PhaseOne website :
IIQ RAW S and IIQ RAW L
Phase One digital back users can choose between storing their tethered captures in two different types of compressed RAW files. (The format for the captures can be set using the Camera tool in the Capture tab).
IIQ RAW stands for Intelligent Image Quality RAW. It is an intelligent way of turning the full 16 bit image data captured by the camera into a compact RAW file format.
The IIQ Large RAW format is unique because it is completely lossless. IIQ RAW Large can be processed into a 16 bit TIFF, even though it is only half the size of a traditional RAW file.
The IIQ Small RAW format is based on the full 16 bit data that is captured by the digital back’s CCD. However, unlike IIQ RAW Large, it is not 100% lossless. Most users will not notice any quality difference between the two file formats especially if the IIQ RAW Small format capture is well exposed and set on a low ISO rating.