Certified proofing

A method of making paper sets, comprising:

• providing a print medium,
• cutting a plurality of sheets from the print medium,
• marking the print medium with machine-readable marks such that the marks are located on different ones of the sheets, and wherein the marks uniquely identify each of the sheets in the plurality of sheets, and
• assembling the plurality of sheets into a set.

A set of ink-jet printable proofing sheets, comprising:

• a plurality of at least five sheets, each comprising:
• a first printable face having a periphery including first, second, third, and fourth edges, wherein the first and third edges are disposed opposite each other on the first printable face, wherein the second and fourth edges are disposed opposite each other on the first printable face, and wherein the first face has properties resulting from a deposited ink drop print-enhancing treatment,
• a second face sharing the periphery and the first, second, third, and fourth edges of the first printable face,
• a first machine-readable mark located on one of the first and second faces and including a plurality of data areas of different densities, and
• a second machine-readable mark, wherein the first and second machine-readable marks are aligned in a direction parallel to the first edge.

A method of making paper sets, comprising:

• providing a print medium,
• cutting a plurality of sheets from the print medium,
• marking the print medium with a set of first and second machine-readable marks such that one of the first marks and one of the second marks are each located on different ones of the sheets, wherein the first and second machine-readable marks each include a plurality of data areas of different densities, and are each located in a margin area along one edge of one of the sheets, and
• assembling the plurality of sheets into a set.

A printing method, comprising:

• detecting a first mark on a first printable sheet of a first type and a first size, wherein the mark identifies a manufacturing characteristic of the first sheet,
• accessing a first stored status identifier corresponding to information expressed by the first mark,
• determining whether to print on the first printable sheet based on the first stored status identifier,
• detecting a second mark on a second printable sheet of the same type and size as the first sheet, wherein the mark identifies a manufacturing characteristic of the second sheet,
• accessing a second stored status identifier corresponding to information expressed by the second mark, and
• determining whether to print on the second printable sheet based on the second stored status identifier.

A printing method, comprising:

• detecting a first preprinted individual sheet identification mark on a sheet,
• printing on the sheet having the first preprinted individual sheet identification mark,
• again detecting the first preprinted individual sheet identification mark on a sheet, and
• refraining from printing on the sheet for which the first preprinted individual sheet identification mark was detected in the step of again detecting.

A printing method, comprising:

• detecting a first preprinted individual sheet identification mark on a sheet,
• printing on the sheet having the first preprinted individual sheet identification mark,
• detecting a second preprinted individual sheet identification mark on a sheet, and
• issuing an alert if the sheet identification marks detected in the steps of detecting are out of sequence.

A printing method, comprising:

• detecting a first preprinted individual sheet identification mark on a sheet,
• printing on the sheet having the first preprinted individual sheet identification mark,
• updating a sheet counter based on the step of detecting,
• detecting further preprinted individual sheet identification marks on further sheets,
• printing on the further sheets having the further preprinted individual sheet identification marks, and
• updating the sheet counter based on the steps of detecting further preprinted individual sheet identification marks on further sheets.