pdf ref manual :

SECTION 4.9 Form XObjects
355
Example 4.30
q% Save graphics state
17 0 0 17 298 388 cm% Scale and translate coordinate space
BI% Begin inline image object
/W 17% Width in samples
/H 17% Height in samples
/CS /RGB% Color space
/BPC 8% Bits per component
/F [ /A85 /LZW ]% Filters
ID% Begin image data
J1/gKA>.]AN&J?]-<HW]aRVcg*bb.\eKAdVV%/PcZ
… Omitted data …
R.s(4KE3&d&7hb*7[%Ct2HCqC~>
EI% End inline image object
Q% Restore graphics state