CTP Workflow

Rudiments of a newspaper CTP workflow to n-up pages for plate production

  • Overlay Editorial and Advertising components of a page:

    pdftk editorial.pdf stamp ad.pdf output complete_page.pdf
  • 2-up broadsheet pages
    --noautoscale true prevents scaling the source PDFs if the output size is bigger/smaller.

    pdfjam --nup 2x1 --suffix 2up --papersize '{23in,22.5in}' \
    --noautoscale true --outfile ./2-up_page.pdf \
    righthand_odd_page.pdf lefthand_even_page.pdf

    Offset them a bit to move them off the top of the page:

    pdfjam --noautoscale true --nup 2x1  \
    --offset '0in -0.125in' --papersize '{34in,23in}' \
    --outfile ./2-up-page.pdf \
    righthand_odd_page.pdf lefthand_even_page.pdf
  • 1-bit TIFF separations - 85lpi halftone screen, 1200x1200 dpi resolution:
    gs -sDEVICE=tiffsep1 -dNOPAUSE -dBATCH -dSAFER -r1200x1200 \
    -dCOLORSCREEN -dDITHERPPI=85 \
    -sOutputFile=separated_%02d.tif inputfile.pdf
  • Convert 1-bit TIFF separations to grayscale
    convert separated\(Black\).tif -compress lzw -depth 8 -colorspace Gray separated-Black.tif
    convert separated\(Cyan\).tif -compress lzw -depth 8 -colorspace Gray separated-Cyan.tif
    convert separated\(Magenta\).tif -compress lzw -depth 8 -colorspace Gray separated-Magenta.tif
    convert separated\(Yellow\).tif -compress lzw -depth 8 -colorspace Gray separated-Yellow.tif
  • Merge the grayscale TIFF files into a composite, halftoned, CYMK image:
    convert separated-Cyan.tif \
    separated-Magenta.tif \
    separated-Yellow.tif \
    separated-Black.tif \
    -set colorspace CMYK -combine -negate combined.tif

Recent Updates

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