Assessing print quality using intensity histograms and perimeter lengths

A print system comprising:

• a printing device to form a printed mark on media by depositing fluid on the media;
• a print quality assessment device, comprising:
• a capture engine to:
• capture a digital representation of the printed mark;
• and
• convert the digital representation into a digital binary mark;
• an analysis engine to calculate a number of values for the digital binary mark;
• a compare engine to compare a combined representation of the number of values for the digital binary mark against a combined representation of a number of values for a model printed mark;
• and
• a controller to adjust an operation of at least one component of the printing device when the combined representation for the digital binary mark is greater than a threshold distance away from the combined representation for the model printed mark.

A computer system comprising:

• a processor;
• a machine-readable storage medium coupled to the processor;
• and
• an instruction set to assess print quality, the instruction set being stored in the machine-readable storage medium to be executed by the processor, wherein the instruction set comprises:
• instructions to convert a printed mark into a digital binary mark;
• instructions to calculate a number of values for the digital binary mark, wherein the number of values comprise:
• a perimeter roughness value;
• a perimeter length value;
• an intensity histogram mean value;
• an intensity histogram variance value;
• and
• an intensity histogram mean-to-variance ratio value;
• instructions to compare the combined representation of the number of values for the digital binary mark against a combined representation for a number of values of a model printed mark;
• and
• instructions to adjust operation of a printing device that generated the printed mark when the combined representation for the digital binary mark is greater than a threshold distance away from the combined representation for the model printed mark.