Simplify the following text for a Grade 7 native English-speaking person.
Original: The DjVu developers report that color magazine pages compress to 40 â `` 70 kB , black and white technical papers compress to 15 â `` 40 kB , and ancient manuscripts compress to around 100 kB ; a satisfactory JPEG image typically requires 500 kB .
Simplified: Black and white technical papers make it smaller to 15 â `` 40 kB . Old manuscripts make smaller to around 100 kB ; a satisfactory JPEG image usually needs 500 kB .