Checking a
Print Proof.

Two kinds of proof, and what each one can and cannot tell you

A PDF (soft) proof, viewed on a monitor, is the fast way to check everything objective: the copy, the spelling, whether the phone number and the web address are right, whether the images are the right ones in the right places, and the page order. It is not a color proof. You are looking at a backlit screen emitting light additively, a fundamentally different process from ink reflecting light off paper — see CMYK vs. RGB for why those never quite match, no matter how good the monitor is.

A hard-copy proof is paper, in the room, viewed the way the finished piece will actually be seen. It shows the true color on the actual stock, whether a fold or score creases where it should, and how a bleed or a trim actually falls at full size. Print-industry color evaluation traditionally uses a standardized daylight-balanced viewing light (often referenced as “D50,” roughly 5000K) precisely because ordinary room lighting shifts how a color reads — if color genuinely matters on a job, ask to view the proof under consistent, neutral light rather than whatever bulb happens to be overhead.

A working checklist

• Text. Read every word, out loud if you can. Spellcheck will not catch a correctly spelled wrong phone number, the wrong year in a date, or a name spelled a different, also-correct way than intended.
• Images. Confirm they are the final, approved versions, correctly cropped and positioned, and not a low-resolution placeholder left in by mistake.
• Color. Check any color that has to be exact against a physical swatch if one exists, especially a logo or brand color running as a spot ink — see spot color vs. process color.
• Bleed and trim. Confirm nothing important sits closer than about 1/8″ to the trim edge, and that anything meant to run off the edge actually does.
• Folds and panels. A flat proof does not show a fold. Check the panel order and which way each fold goes — a Z-fold and a letter fold read identically on a flat sheet and behave completely differently once folded.
• Page order and imposition. On anything bound, confirm the pages land in reading order once the sheet is folded and trimmed — not the order they appear on the flat press sheet.
• Blank pages. If the page count forced in a blank page or two (common on a saddle-stitched book, which must run in multiples of four — see saddle stitch vs. coil vs. perfect binding), confirm the blanks landed somewhere sensible.

Why this step is worth the time it takes

A proof is the last stage of a job where a change is essentially free — a correction on screen or on paper before plates are made. After a proof is approved, a change means remaking a plate and rerunning press time, a materially different cost. Twenty careful minutes on a proof is consistently the cheapest twenty minutes in the whole process — see prepress for what happens on either side of it — and it is worth showing the proof to whoever in your organization would actually complain if something were wrong.