is it possible to convert spot colors to it’s cmyk values in pdf? I have a bunch of pdf’s with mixed colors inside, some objects have cmyk values only and other have applied spot color. I need to convert these spot’s to CMYK values.

As I am completly new to ghostscript im trying to base on examples posted by others, like this one:

gswin64c `
    -dNOPAUSE -dBATCH `
    -sDEVICE=pdfwrite `
    -sProcessColorModel=DeviceCMYK `
    -sColorConversionStrategy=CMYK `
    -sOutputFile=output.pdf input.pdf

But it leaves spot colors untouched. Any idea how to manage this? I’m using gs 10.03.1

I am not experienced in this kind of tools so it may be that i don’t fully understand how it works.