It seems that jpeg to scr conversion is mainly related to transformation of JPEG pictures (.jpg, .jpeg) to Sun Raster pictures (.scr). This can be probably done using any graphics editor that can open both of these files, but support for SCR format seems to be somewhat rare.
Convert JPEG bitmap image format to Sun Raster bitmap image file.
We have found 2 software records in our database eligible for .jpeg to .scr file format conversion.
Microsoft Windows software - convert jpeg to scr on Windows
A complete image retouching program
Convert from jpeg 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 jpeg to scr. 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.
Multiplatform software - convert jpeg to scr on any platform
A popular utility for viewing and converting graphic files