Abstract: A method for determining an image quality verification (IQV) metric for false color artifacts in chromatic areas of digital images includes receiving a digital image that includes flat pure color patches and mixed color texture patches; processing the digital image in an image signal processing chain such that a red/green/blue image is produced; transforming the red/green/blue image into an LAB color space image; calculating, for each mixed color pixel in a mixed color texture patch, a chromatic distance in the LAB color space from the mixed color pixel in the mixed color texture patch to a center of each flat pure color patch; performing directional adjustments on each of the chromatic distances; and defining, for each mixed color patch, the IQV metric for the for the mixed color patch as a function of the distance metrics of each mixed color texture pixel in the mixed color patch.

Abstract: A method for determining an image quality verification (IQV) metric for false color artifacts in chromatic areas of digital images includes receiving a digital image that includes flat pure color patches and mixed color texture patches; processing the digital image in an image signal processing chain such that a red/green/blue image is produced; transforming the red/green/blue image into an LAB color space image; calculating, for each mixed color pixel in a mixed color texture patch, a chromatic distance in the LAB color space from the mixed color pixel in the mixed color texture patch to a center of each flat pure color patch; performing directional adjustments on each of the chromatic distances; and defining, for each mixed color patch, the IQV metric for the for the mixed color patch as a function of the distance metrics of each mixed color texture pixel in the mixed color patch.

Abstract: The application describes an ink delivery system for an inkjet printer. The system includes a first ink tank operative to supply ink to at least one inkjet printhead and a second ink tank operative to receive ink flown through at least one printhead and not used by at least one printhead. The ink for printing is drawn by low pressure from a first tank through the printhead to a second ink tank. Each of the ink tanks includes a cylindrical tubular segment and a segment with a frustoconical inner section.