The total ink limit, also called total area coverage or TAC, is the highest combined percentage of cyan, magenta, yellow and black allowed at any one spot on the page. Printers set it by press and paper: Print-on-demand book printers such as IngramSpark ask for 240 percent, while widely used offset profiles allow 300 or 320 percent. ProofSlip, a Windows app from Automata Labs, checks a print PDF for ink limit and rich black problems on your PC and boxes each finding on its page, so you can fix the file before the printer sends it back.
This guide explains where the numbers come from, which one applies to your job, how to find the areas that go over, and how to bring them down.
Check a print PDF for ink limit and rich black problems before it goes to the printer.
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What is total area coverage?
Each process ink can run from 0 to 100 percent, so four inks together can reach 400 percent. Total area coverage is that sum at a single point. Adobe’s Output Preview help for Acrobat Pro gives an example: “280 means 280% ink coverage, which could be accomplished with 60C, 60M, 60Y, and 100K.”
Too much ink causes trouble. Adobe’s page puts it simply: “Too much ink can saturate paper and cause drying problems or change the expected color characteristics of the document.” IngramSpark’s file guide adds that “Oversaturation can cause excessive ink buildup, loss of detail, and inaccurate color appearance.”
TAC is a peak, not an average. It is about the darkest single spot on the page. The average coverage across a page, which matters for pricing and toner use, is a much smaller number; our explainer on what ink coverage is covers that side.
Why do printers ask for 240, 300 or 320 percent?
The limit depends on the press, the paper and the printing condition the file is built for, and each standard printing condition comes with output profiles that build in a limit. The published profiles show the range. We checked these in the ICC profile registry today:
| Profile | Printing condition | TAC in the registry |
|---|---|---|
| PSO Coated v3 | FOGRA51, premium coated, ISO 12647-2:2013 | 300% |
| PSO Uncoated v3 | FOGRA52, wood-free uncoated | 300% |
| GRACoL2013 CRPC6 | CGATS 21-2 CRPC6, coated | 320% |
| CGATS21 CRPC1 | CGATS 21-2 CRPC1 | 240% |
Print-on-demand book printers often set their own lower limit. The IngramSpark File Creation Guide says “total ink coverage should stay within the maximum range of 240% total CMYK value,” and warns that “Files sent with densities higher than 240% may be rejected for correction.” Our IngramSpark file requirements guide covers the rest of that spec.
The number that applies to your job is the one on your printer’s spec sheet. If you cannot find it, ask. Adobe’s advice is the same: “Ask your print service provider for the maximum ink coverage of the press you use for printing.”
What pushes a file over the limit?
Most overloaded areas come from a handful of habits:
| Source | Typical build | Total |
|---|---|---|
| Registration color used as black | 100 / 100 / 100 / 100 | 400% |
| A “rich black” picked by eye in a color picker | Often well above 300 | Varies |
| Dark photos converted with a high-TAC profile, then sent to a low-TAC press | Shadows near the profile limit | Up to 300 to 320% |
| Dark overlays and shadows stacked with transparency | Inks add where objects overlap | Varies |
| IngramSpark’s recommended rich black | 60 / 40 / 40 / 100 | 240% |
The last row is useful as a target. IngramSpark recommends a rich black of “60% Cyan / 40% Magenta / 40% Yellow / and 100% Black” and says elements “should not be built in ‘Registration’ (100% of all colors).” That rich black adds up to exactly 240 percent, the same as its limit. The same guide asks for 100 percent black only on text of 24 pt and below.
Dark photographs are the sneaky case. An image separated for a coated press with a 320 percent profile can carry shadows over 300 percent, which is fine for that press and too heavy for a 240 percent book printer. The fix is to convert the image with a profile that matches the target condition, not to edit pixels by hand.
See each ink limit finding on its page, with the trim and safe area drawn in.
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How do you find areas over the limit in a PDF?
There are two practical ways on Windows.
In Acrobat Pro. Open All tools, Use print production, Output preview. Choose Separations from the Preview menu, select Total Area Coverage and enter your printer’s limit. Adobe’s help says “Highlights identify areas where the ink coverage exceeds that percentage.” You can hover over an area to read the ink percentages, or Alt-click it to add a comment with the values.
With ProofSlip. Drop the PDF on the window and pick the job preset that matches it, from business cards to book interiors and paperback covers. According to its Microsoft Store listing, ProofSlip checks small text, rich black, hairlines, ink limit, white overprint, transparency and printable comments, along with fonts, image resolution, colour spaces and the plates the file needs. Select a finding to see its page with the problem boxed, and export an HTML report that shows them too.
| Acrobat Pro Output Preview | ProofSlip | |
|---|---|---|
| Ink limit check | Total Area Coverage highlight at the percentage you type | Ink limit finding, boxed on its page |
| Rich black | Color Warnings, Rich Black | Rich black finding |
| Other checks in the same pass | Separate tools (Preflight) | Fonts, resolution, plates, bleed, safe area, overprint, transparency |
| Report | Comments you add | HTML report, every file at once |
| Fixes the file | Can, with other tools | No; ProofSlip never changes files |
Either way, compare the result with your printer’s number. A finding tells you where to look; the spec sheet tells you whether it matters for this job.
How do you bring ink coverage down?
Fix it in the source file, then export again. In rough order of effort:
- Replace Registration black with your printer’s rich black, or with 100 percent K for text and thin lines.
- Rebuild rich blacks to a recipe within the limit, such as the 60 / 40 / 40 / 100 build when the limit is 240 percent.
- Convert images to the right output profile. Use the profile your printer names, or one with a TAC at or below their limit. This lightens the shadows evenly instead of clipping them.
- Check dark overlays. A black shadow at 80 percent opacity over a full-color photo can push the total up where they overlap.
- Check again before you send. Our print-ready PDF checklist and the PDF preflight check for Windows page cover the rest of the file.
Some printers apply their own ink limiting on the way to press. That is not a reason to send heavy files: the printer’s conversion may change your dark tones in ways you did not approve.
Frequently asked questions
Is 300 percent always safe for offset printing?
No. 300 percent is the TAC of the PSO Coated v3 and PSO Uncoated v3 profiles in the registry, and GRACoL2013 CRPC6 allows 320 percent, but your printer’s press and paper decide. Use their number.
Does the ink limit apply to spot colors?
Total area coverage is usually discussed for the process inks. Ask your printer how they count spot colors that overprint process inks.
Why does my file pass at one printer and fail at another?
They set different limits. A file built for a 320 percent coated press can fail a 240 percent print-on-demand check.
Will ProofSlip fix the ink limit for me?
No. ProofSlip reads files and never changes them. Fix the source file and check again.
Try ProofSlip
ProofSlip is a one-time purchase in the Microsoft Store with a free trial. There is no account and no upload; files never leave your PC. More detail is on the ProofSlip product page, and our guide to GWG 2015 sheetfed CMYK preflight covers a full industry specification.
Know where the ink is too heavy before the printer tells you.
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Adobe and Acrobat are trademarks of Adobe. IngramSpark is a trademark of Ingram Content Group.
Last updated 21 October 2026. Published by Automata Labs, a software company in Canada.