Orthanc can receive/store/send any kind of standard DICOM files (cf. the DICOM conformance statement).
However, its core engine is not able to render all of them as PNG images. An image that Orthanc cannot decode is displayed as “Unsupported” by Orthanc Explorer. Currently, the core engine of Orthanc can decode:
The supported photometric interpretations are:
The Orthanc core supports from 8bpp to 16bpp depth, with integer values. Multiframe (notably cine), uncompressed DICOM instances can also be displayed from Orthanc Explorer.
Other type of encodings are available in the Web viewer plugin, that mostly supports whatever is supported by the well-known GDCM toolkit by Mathieu Malaterre. Note however that multiframe (notably cine) DICOM instances are currently not supported by the Web viewer plugin.
Finally, consider having a look at the section in the Orthanc Book about the compatible DICOM viewers.