Offset vs. Digital
Printing: How to Choose.

Two different machines, not two grades of quality

Offset and digital printing are often talked about as though one is the “better” process and the other the budget option. They are not graded on the same scale. They are two different ways of getting ink or toner onto paper, and each is genuinely better suited to a different kind of job.

How offset actually works

An offset press images the job onto a thin metal plate, one plate per ink color. On press, the plate picks up ink on the image area and repels it everywhere else, and that inked image transfers first to a rubber blanket cylinder and only then to the sheet — which is where the name comes from: the image is offset onto the blanket before it ever touches paper. Making that plate and getting a press dialed in — ink and water balanced, color and registration settled — is a fixed cost paid once, at the start of the job, whatever the quantity turns out to be.

How digital printing actually works

A digital press — toner-based or inkjet — puts the image directly on the sheet from the file, one impression at a time, with no plate and almost no press setup. That is the entire advantage: skip plate-making and makeready, and a run of a few dozen pieces becomes worth printing at all. It is also why two consecutive digital impressions can be entirely different jobs, since nothing is committed to one fixed image the way a plate is.

Why the two have different cost curves

Offset spends money up front (plates, makeready) and very little per additional sheet after that, so its average cost per piece drops sharply as the quantity climbs. Digital spends almost nothing up front and a fairly constant amount per impression, so its cost per piece barely moves whether you print fifty or five hundred. Plot both against quantity and the lines cross: below the crossover, digital is cheaper; above it, offset is, and the gap widens the further past it you go. See how print quantity changes the economics for the mechanism in more depth.

Where the two differ beyond price

• Exact colors. Digital builds every color from a fixed set of toners or inks. Running a Pantone spot color — a single ink mixed to a formula and printed solid rather than approximated from dots — is an offset thing. See spot color vs. process color.
• Stock. Toner is fused to the sheet with heat, which limits how heavy and how textured a stock can be. Offset generally runs a wider range of paper.
• Large flat solids. A big block of solid color is where the visual difference between toner and ink is most likely to show. Small type and photographs generally do not show it.
• Reprint stability. Nothing is committed to a plate on a digital press, so a small reprint or a last-minute text change costs about the same as the first run. On offset, any change means a new plate.

A short checklist

Before deciding, have answers ready for: the quantity, whether an exact brand color has to hold, how heavy or textured the stock is, and whether the piece is likely to be reprinted with small changes. Quantity usually settles it on its own; the other three are what move the crossover point in either direction.