Pictures from Sumo Paint Pro art drawing program (.sumo) can be converted and saved as JPEGs only with the original software and no other. Alternative would be conversion to PNG, however, the program does not support any other graphics formats for support.
Convert Sumo Paint image file to JPEG bitmap image format.
We found one software available in the database for this conversion.
Apple macOS / Mac OS X software - convert sumo to jpg on OS X
An art design software
Convert from sumo file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.