-s takes strings, -d takes numbers or names.
You've set -sColorConversionStrategy=/CMYK when it should be -sColorConversionStrategy=CMYK or -dColorConversionStrategy=/CMYK
另外,列出当前版本ghostscript支持的开关
gswin64c.exe -q -o 123.txt -sDEVICE=pdfwrite -c "currentpagedevice {exch ==only ( ) print == } forall"
linux下可以结合sort,更好看一些
gs -q \
-o /dev/null \
-sDEVICE=pdfwrite \
-c "currentpagedevice {exch ==only ( ) print == } forall" \
| sort
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