▁bytes ▁long , ▁but ▁the ▁pad ▁byte ▁is ▁not ▁included ▁in ▁the ▁chunk ' s ▁length ▁field . ▁ ▁CR NG : ▁Col our ▁range ▁ ▁The ▁colour ▁range ▁chunk ▁is ▁' non standard '. ▁ ▁It ▁is ▁used ▁by ▁Electron ic ▁Arts ' ▁Del ux e ▁P aint ▁program ▁to ▁identify ▁a ▁cont igu ous ▁range ▁of ▁colour ▁registers ▁or ▁a ▁" sh ade ▁range " ▁and ▁colour ▁cy cling . ▁ ▁There ▁can ▁be ▁zero ▁or ▁more ▁CR NG ▁ch unks ▁in ▁an ▁IL B M ▁file , ▁but ▁all ▁should ▁appear ▁before ▁the ▁B OD Y ▁chunk . ▁ ▁Del ux e ▁P aint ▁normally ▁writes ▁ 4 ▁CR NG ▁ch unks ▁in ▁an ▁IL B M ▁when ▁the ▁user ▁asks ▁it ▁to ▁" Save ▁Picture ". ▁ ▁C CR T : ▁Col our ▁cy cling ▁ ▁Com mod ore ' s ▁Graph ic raft ▁program ▁uses ▁C CR T ▁for ▁Col our ▁Cy cling ▁Range ▁and ▁Tim ing . ▁This ▁chunk ▁contains ▁a ▁Cy cle Info ▁structure . ▁Like ▁CR NG ▁it ▁is ▁a ▁non standard ▁chunk . ▁ ▁The ▁data ▁is ▁similar ▁to ▁a ▁CR NG ▁chunk . ▁ ▁A ▁program ▁would ▁probably ▁only ▁use ▁one ▁of ▁these ▁two ▁methods ▁of ▁express ing ▁colour ▁cycle ▁data . ▁You ▁could ▁write ▁out ▁both ▁if ▁you ▁want ▁to ▁communicate ▁this ▁information ▁to ▁both ▁Del ux e Paint ▁and ▁Graph ic raft . ▁ ▁DE ST : ▁Bit plane ▁combining ▁ ▁The ▁optional ▁property ▁DE ST ▁is ▁a ▁way ▁to ▁control