▁how ▁to ▁scatter ▁zero ▁or ▁more ▁source ▁bit plan es ▁into ▁a ▁deeper ▁destination ▁image . ▁ ▁Some ▁readers ▁may ▁ignore ▁DE ST . ▁ ▁The ▁low ▁order ▁depth ▁number ▁of ▁bits ▁in ▁plane P ick , ▁plane On Off , ▁and ▁plane Mask ▁correspond ▁one - to - one ▁with ▁destination ▁bit plan es . ▁Bit ▁ 0 ▁with ▁bit plane ▁ 0 , ▁etc . ▁Any ▁higher ▁order ▁bits ▁should ▁be ▁ignored . ▁ ▁" 1 " ▁bits ▁in ▁plane P ick ▁mean ▁" put ▁the ▁next ▁source ▁bit plane ▁into ▁this ▁bit plane ", ▁so ▁the ▁number ▁of ▁" 1 " ▁bits ▁should ▁equal ▁num Pl anes . ▁" 0 " ▁bits ▁mean ▁" put ▁the ▁corresponding ▁bit ▁from ▁plane On Off ▁into ▁this ▁bit plane ". ▁ ▁B its ▁in ▁plane Mask ▁gate ▁writing ▁to ▁the ▁destination ▁bit plane : ▁" 1 " ▁bits ▁mean ▁" write ▁to ▁this ▁bit plane " ▁while ▁" 0 " ▁bits ▁mean ▁" le ave ▁this ▁bit plane ▁alone ". ▁The ▁normal ▁case ▁( with ▁no ▁DE ST ▁chunk ) ▁is ▁equivalent ▁to ▁plane P ick ▁= ▁plane Mask ▁= ▁( 2 ▁^ ▁num Pl anes ) ▁- ▁ 1 . ▁ ▁Remember ▁that ▁color ▁numbers ▁are ▁formed ▁by ▁pixels ▁in ▁the ▁destination ▁bitmap ▁( depth ▁plan es ▁deep ) ▁not ▁in ▁the ▁source ▁bitmap ▁( num Pl anes ▁plan es ▁deep ). ▁ ▁GR AB : ▁Hot spot ▁ ▁The ▁optional ▁GR AB ▁chunk ▁loc ates ▁a ▁" handle " ▁or ▁"