GraphicsMagic is unable to identify background transparency of PDF
问题 GM is unable to identify background transparency of PDF and PNG created using "gm convert" gets white background while same PDF is converted to PNG with transparent background by IM. $convert -verbose /var/tmp/abc.pdf /var/tmp/abc.png /var/tmp/magick-16370Tq7WYv5U54Pa1 PNG 288x720 288x720+0+0 8-bit sRGB 20.7KB 0.000u 0:00.009 /var/tmp/abc.pdf PDF 288x720 288x720+0+0 16-bit sRGB 20.7KB 0.000u 0:00.000 /var/tmp/abc.pdf=>/var/tmp/abc.png PDF 288x720 288x720+0+0 8-bit sRGB 17c 16.6KB 0.010u 0:00