It may be possible that you can somehow export Bryce leaf shape files (.lps) as JPEG pictures (.jpg, .jpeg) using the Bryce software itself. Unfortunately, we couldn't really verify this information or find anything relevant to a possible lps to jpg conversion.
Convert Bryce leaf shape to JPEG bitmap image format.
We found 2 software records in the database related to .lps to .jpg file format conversion.
Microsoft Windows software - convert lps to jpg on Windows
A graphics design tool for making 3D landscaping and animations
Convert from lps file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned lps to jpg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert lps to jpg on OS X
3D modeling and animation package for Mac.