Hewlett-packard Development Company, L.P.

Maya Shalev

Doron Shaked

Gideon Amir

Hila Nachlieli

Michael Plotkin

Eyal Shelef

Shlomo Harush

Haim Livne

Gregory Braverman

Craig Breen

Shai Druckman

Yaniv Yona

Barak Markus

Gidl Amir

Haim Livine

A method, diagnostic tool and system are provided for evaluating printing defects. A captured image of a printed sheet is received and a profile generated of the printed sheet, this profile being representative of tonal variations in the printed sheet. The profile is analyzed in a plurality of different scales and an assessment made of the significance of one or more features of a printing defect throughout the plurality of different scales. From the assessed significance of the one or more features, an evaluation is carried out, in each of the plurality of different scales, of the severity of the printing defect.

Method and apparatus for evaluating printed images

A correction method for correcting unintended spatial variation in lightness across a physical image produced by a xerographic process, the method comprising producing a test image using the xerographic process, measuring a difference between actual lightness and intended lightness across at least part of the test image, and varying the light source level used subsequently in the xerographic process to correct for the measured unintended difference.

Correction method, apparatus, data carrier or system for correcting for unintended spatial variation in lightness across a physical image produced by a xerographic process

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Tel Aviv, Israel

Maya Shalev