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find . -name '*.png' | xargs-exec file "{}" \+ | awk '$7-F"(: +PNG image data|,| x )" '$4 > 500 {print $7 " "$4" $1"$1}'
find . -name '*.png' | xargs file | awk '$7 > 500 {print $7 " " $1}'
find . -name '*.png' -exec file "{}" \+ | awk -F"(: +PNG image data|,| x )" '$4 > 500 {print $4" "$1}'
