Try specifying fd0, force jpg out
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@ -11,7 +11,7 @@ def image_resize(url, %{max_width: max_width, max_height: max_height} = options)
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quality = options[:quality] || 85
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cmd = ~s"""
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convert - -resize '#{max_width}x#{max_height}>' -quality #{quality} -
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convert fd:0 -resize '#{max_width}x#{max_height}>' -quality #{quality} jpg:-
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"""
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pid = Port.open({:spawn, cmd}, [:use_stdio, :stream, :exit_status, :binary])
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