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Although we don't really understand transparency when printing is being carried out. It seems PDF will handle calls for transparency even when using CMYK colors.
""" A simple usage of alpha (transparent) CMYK colours """ from reportlab.graphics.shapes import Rect from reportlab.pdfgen.canvas import Canvas from reportlab.lib.colors import PCMYKColor filename = 'not-snip9.pdf' red = PCMYKColor(0,100,100,0) black = PCMYKColor(0,0,0,100) blue = PCMYKColor(100,100,0,0) red50transparent = red.clone(alpha=50) c = Canvas(filename,pagesize=(400,200)) c.setFillColor(black) c.setFont('Helvetica', 10) c.drawString(25,180, 'solid') c.setFillColor(blue) c.rect(25,25,100,100, fill=True, stroke=False) c.setFillColor(red) c.rect(100,75,100,100, fill=True, stroke=False) c.setFillColor(black) c.drawString(225,180, 'transparent') c.setFillColor(blue) c.rect(225,25,100,100, fill=True, stroke=False) c.setFillColor(red50transparent) c.rect(300,75,100,100, fill=True, stroke=False) c.save()