High ink density titles are those titles where a single or double-sided page(s) within the interior of a book contains a high level and/or area of Black or CMYK ink saturation (see image further below), which, when printed on Lightning Source printing equipment, may cause streaks, wrinkled, or curling of pages. IngramSpark may be unable to fulfill a B&W or Color print order due to areas of high ink density/heavy ink coverage within these titles. Where we identify a title with high ink density coverage, we will contact the publisher with possible solutions.
Files should not have TAC (Total Area Coverage) that exceeds 240%. Total area coverage (TAC) is the combined value of all CMYK. For example, recommended rich black is:
- C (cyan) 60%
- M (magenta) 40%
- Y (yellow) 40%
- K (black) 100%
When totaled, it equals 240%.
This can be viewed in Acrobat Pro by opening the file, going to:
- View/Tools/Print Production/Open
- Select Output Preview
- Check the box for Total Area Coverage
- Change number to 240. This will highlight anything in the file that has a TAC higher than 240. It defaults to lime green, but you can change the color if you like.
Alternatively, you can run a preflight check for the file in Acrobat Pro. We recommend making any adjustments to the original art files and updating those files in InDesign.
To prevent oversaturation of paper within your book, Lightning Source recommends no more than a 40% difference in front-to-back coverage.* In the event that we cannot print your black and white, or color book, due to saturation issues, we do offer Premium printing. For specifications and pricing, please review your print and ship calculator under the title in your account.