According to the above-mentioned methods, twelve JPEG2000 viewers were identified, to which, for sake of comparison, also a digital microscopy viewer has been added in the analysis . The next section will detail the observations made.
The following viewers were selected: kdu_show (KakaduSoftware), JP2View (Mustek), Brava!DesktopIXL (InformativeGraphics), OpenEV (GeoInnovations), XnView (Pierre Gougelet), eFotoXpress Viewer (eFotoExpress), JP2view (OptimiData), ER Viewer (Earth Resource Mapping), IrfanView (Irfan Skiljan), TNTAtas (MicroImages), Vliv (Frederic Delhoume), Stardust Image Viewer (Stardust Software), JVSView (University of Tampere).
Most of the viewers have been developed for geographic imaging, which is perhaps the closest field to digital microscopy, for either image size and interaction needs.
Files developed for conformance tests have been downloaded from the web site http://www.crc.ricoh.com/~gormish/jpeg2000conformance/.
An attempt to open relevant files has been made with all the viewers. This step included codestreams Profile 0 and Profile 1 (.j2k files), and JPEG2000 files (.jp2 files). Furthermore, digital slides produced starting from images acquired with eSlide  have been converted into PPM format by means of LargeMontage (University of Tampere, Finland) and then to JPEG2000 by means of kdu_compress (Kakadu Software, New Zealand).
Table 1 shows the results. Where the value "some" appears, it means that some image has not been opened and/or some image has been opened but with visualization errors.
Digital slide tests
Last tests evaluated how the viewers passing the above tests behave in terms of digital pathology. The smaller of the two tested digital slides was opened and the time needed was measured; in addition to that, the interface has been examined to find the most important features needed for digital microscopy, i.e., magnification and field navigation. Table 2 shows the results.