mxl to jpg conversion is typically searched by users that want to export their music scores and notation sheets as simple pictures, for example in JPEG format. Such function is common in todays music notation software, it's just that PNG format is preferred and not every tool might support JPEG as well. But you can always convert graphics files in any format you want, simple by using standard graphics editors.
Just keep in mind that exporting music scores as pictures will make them unusable in music software and the recovery back requires OMR solution.
Updated: September 21, 2023
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