Add alpha channel
" POSITION="1693.2717975222981 1467.7457918256919" TOP_LEFT="1693.2717975222981 1467.7457918256919" BOTTOM_RIGHT="1692.2717975222981 1468.7457918256919" BOUNDING_RECT="1693.2717975222981 1467.7457918256919 -1 -1" ORDER="500000000000057" FOLLOW_ANCHOR="true" INFO_NODE="false" COLOUR="1,1,0.78431372549019607,0.19607843137254902" SIZE_POLICY="10" ANCHORED_NODE="53">Mosaick using alpha
" POSITION="2919.7794377943783 1464.6207605753791" TOP_LEFT="2919.7794377943783 1464.6207605753791" BOTTOM_RIGHT="3349.7794377943783 1465.6207605753791" BOUNDING_RECT="2919.7794377943783 1464.6207605753791 430 -1" ORDER="500000000000059" FOLLOW_ANCHOR="true" INFO_NODE="false" COLOUR="1,1,0.78431372549019607,0.19607843137254902" SIZE_POLICY="10" ANCHORED_NODE="9">Remove alpha channel
" POSITION="3497.9102191021911 1461.8889688896884" TOP_LEFT="3497.9102191021911 1461.8889688896884" BOTTOM_RIGHT="3496.9102191021911 1462.8889688896884" BOUNDING_RECT="3497.9102191021911 1461.8889688896884 -1 -1" ORDER="500000000000060" FOLLOW_ANCHOR="true" INFO_NODE="false" COLOUR="1,1,0.78431372549019607,0.19607843137254902" SIZE_POLICY="10" ANCHORED_NODE="11">Because we set the alpha to the brightness, the brighter areas will have more influence over the values at the boundaries, which should lead to a cleaner transition between the adjoining images.
" POSITION="2806.2780627806287 1036.4914792825662" TOP_LEFT="2806.2780627806287 1036.4914792825662" BOTTOM_RIGHT="3740.6624066240665 806.48947926256596" BOUNDING_RECT="2806.2780627806287 1036.4914792825662 934.38434384343782 230.0020000200002" ORDER="500000000000061" FOLLOW_ANCHOR="true" INFO_NODE="false" COLOUR="1,1,0.78431372549019607,0.19607843137254902" SIZE_POLICY="10" ANCHORED_NODE="9">Set alpha value to average brightness
" POSITION="2331.2733127331267 1505.2461668294418" TOP_LEFT="2331.2733127331267 1505.2461668294418" BOTTOM_RIGHT="2761.2733127331267 1506.2461668294418" BOUNDING_RECT="2331.2733127331267 1505.2461668294418 430 -1" ORDER="500000000000058" FOLLOW_ANCHOR="true" INFO_NODE="false" COLOUR="1,1,0.78431372549019607,0.19607843137254902" SIZE_POLICY="10" ANCHORED_NODE="17">