What is Total Area Coverage (TAC)?
Total Area Coverage (also called Total Ink Coverage or TIC) is the sum of the cyan, magenta, yellow and black percentages in the heaviest-inked spot of your file. Pure rich black at 100/100/100/100 is 400% TAC — and that much wet ink usually won't dry properly, smearing onto the next sheet. Every press has a limit, and staying under it is basic file hygiene.
How TAC adds up
Each ink channel runs from 0% to 100%. TAC is just their sum in any given pixel. A mid-grey at 40/30/30/10 is 110% TAC — no problem. The danger lives in your darkest shadows and rich blacks, where all four channels pile up.
The theoretical maximum is 400% (solid in all four). No commercial press accepts that. Real limits sit well below it, set by how fast the ink can dry on a given paper and press.
Safe limits by paper and process
There is no universal number
These are starting points, not gospel. Your printer's spec sheet wins every time. When in doubt, ask for the maximum TAC before you build heavy shadows or rich blacks.
| Paper / process | Max TAC | Why |
|---|---|---|
| Newsprint / coldset | 240% | Very absorbent, slow drying |
| Uncoated offset | 260–280% | Soaks up ink |
| Coated sheetfed | 300% | Ink sits on surface, dries faster |
| High-end coated | 320% | Premium press + coating |
| Digital / toner | 240–300% | Varies by engine — ask |
What goes wrong when you exceed it
Too much ink in one place causes real, visible production faults:
- Set-off — wet ink transfers onto the back of the sheet stacked on top of it.
- Slow drying / blocking — sheets stick together in the pile.
- Mottling and flooding — shadow detail fills in and goes muddy.
- Registration trouble — heavy wet areas can distort or offset, blurring fine detail.
These are the kinds of problems that get a job pulled off the press, so prepress checks TAC before plates are made.
How to bring TAC down
The cleanest fix is to use the correct CMYK ICC profile for your paper when you convert from RGB. Profiles like FOGRA39 (coated) or FOGRA47 (uncoated) apply GCR/UCR — they swap overlapping CMY ink for black where possible, cutting total coverage while keeping the colour. Most over-TAC files are simply RGB images converted with the wrong (or no) profile.
For rich black specifically, don't use 100/100/100/100. A recipe like 60/40/40/100 (240% TAC) gives a deep, neutral black that dries. Reserve heavy rich blacks for large solids, and use plain 100% K for small text.
Before sending, check the heaviest areas. The Ink Coverage / TAC checker estimates coverage from an image and highlights anything over your chosen limit, so you can fix it before it reaches the press.
Frequently asked questions
What's a safe TAC if I don't know the press?
300% is a reasonable default for coated stock and 280% for uncoated. But confirm with your printer — newsprint can be as low as 240%.
Is rich black 400% bad?
Yes. 100/100/100/100 is far too much ink for any normal press; it won't dry cleanly and causes set-off. Use a rich black recipe around 240% TAC, such as 60/40/40/100.
Does TAC apply to digital and toner printing too?
Yes, though toner behaves differently from wet ink. Digital engines still have coverage limits — typically 240–300% — so heavy four-colour blacks can still cause problems. Ask your provider.
How do I lower TAC without changing the look?
Convert to CMYK using the correct paper profile so GCR/UCR replaces overlapping CMY with black. This drops total ink while keeping the colour appearance almost identical.
The number prepress quietly checks
Total ink coverage is one of those things nobody thinks about until a job sets off in the stack. We check it on every heavy black before plates are made — a thirty-second habit that saves a very bad day. Reviewed June 14, 2026.