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#!/bin/bash
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for i in *.png; do
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convert "$i" -channel Blue -evaluate set 0 +channel "$i".noblue && \
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convert "$i" "$i".noblue -compose difference -composite -separate -evaluate-sequence max -auto-level -negate "$i".maski && \
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convert "$i" "$i".maski -alpha off -compose Copy_Opacity -composite "$i".final && \
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convert "$i".final -channel A -threshold 75% "$i".final_noA && \
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rm "$i".noblue "$i".maski "$i".final && \
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mv "$i".final_noA "$i".final
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done
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mv *.final ./final/
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rm *.png
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cd ./final
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for a in *.final; do
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mv -- "$a" "${a%.final}"
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done
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