gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.5 -dNOPAUSE -dQUIET -dBATCH -dPrinted=false -sOutputFile=compressed-main.pdf -sColorConversionStrategy=CMYK -dProcessColorModel=/DeviceCMYK main.pdf
 gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.5 -dNOPAUSE -dQUIET -dBATCH -dPrinted=false -sOutputFile=compressed-covers.pdf -sColorConversionStrategy=CMYK -dProcessColorModel=/DeviceCMYK covers.pdf
 gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.5 -dNOPAUSE -dQUIET -dBATCH -dPrinted=false -sOutputFile=final/compressed-onesheet.pdf -sColorConversionStrategy=CMYK -dProcessColorModel=/DeviceCMYK onesheet.pdf
pdfimages -list compressed-main.pdf
pdfimages -list final/compressed-onesheet.pdf
pdfimages -list compressed-covers.pdf
pdftk A=compressed-main.pdf B=compressed-covers.pdf cat B1 A2-end output final/final1.pdf
pdftk A=compressed-main.pdf B=compressed-covers.pdf cat B2 A2-end output final/final2.pdf
pdftk A=compressed-main.pdf B=compressed-covers.pdf cat B3 A2-end output final/final3.pdf
pdftk A=compressed-main.pdf B=compressed-covers.pdf cat B4 A2-end output final/final4.pdf
pdftk A=compressed-main.pdf B=compressed-covers.pdf cat B5 A2-end output final/final5.pdf