Neugebauer primaries halftone level adjustment

A printing apparatus comprising:

• a print device to print an image onto a substrate;
• a memory having adjustments for received halftone levels for NPs for a halftone depending on whether the halftone corresponds to a line or an area fill and a corresponding printing attribute threshold;
• a processor to:
• receive halftone levels for NPs for a halftone for printing an image;
• determine whether the halftone corresponds to a line or an area fill;
• adjust a said halftone level using the adjustments in response to determining that the received halftone level exceeds a corresponding printing attribute threshold;
• cause the print device to print the image using the adjusted halftone levels for the halftone.