What does it show?
The PDF contains black letters and graphics that are incorrect from a printing point of view.
How to interpret the result?The PDF contains a black letter or graphic that is not 100% black, but made of a mixture of 4 colors.
PDF 100% black font or graphics error.
What does the warning mean?
When printing, these letters or graphics may not have nice contours. The readability of the text deteriorates.
The following converter corrects the error if all four colors are between 50-100%.
If the letter or graphic is included as an image in the PDF, the error cannot be corrected.
How the problem could be resolved?