"Try renaming the pic file as (file name).jpeg - for example birthday.jpeg "
Renaming a file will NOT change it file type any more than changing a file called Word.doc to word.xls will change it to an Excel Spreadsheet.
To convert from one format to another you must use a program like Irfanview click here to do the conversion.
think of it like this. Imagine you have a French copy of "Hamlet". You can't change the words inside to German, Italian or any other language just by crossing out French on the cover and writing on Italian etc