The two attached EXR files contains the FreeImage logo with float channels (RGB and RGBA). Exporting to PSD and reimporting them looks good, but the PSD files look wrong when opened in Gimp. Furthermore, these files cannot be opened by Photoshop at all which makes be believe that there is something wrong in FreeImage (and not in Gimp -- or better: and not only in Gimp).
$ ./example_import_export test_logo_float3.exr test_logo_float3.psd
$ ./example_import_export test_logo_float4.exr test_logo_float4.psd
Thanks for reporting these. I will look into them at some point