A typical print, on the other hand, reflects light from a combination of cyan, magenta, yellow and black pigments, dyes, waxes or toners. A monitor produces images by modulating the strength of the red, green and blue electron beams that make its phosphors glow. Scanners, digital cameras, monitors and printers all render color in different ways. To advance to this next step we need to learn about color management - what it is and how it is employed. We learned a simple and effective method for neutralizing color casts, but we weren't concerned with matching the colors of the original slide, or with making accurate prints. In the first part of this series, we looked at basic techniques for scanning, color correcting and sharpening digital images.
Digital Color Imaging Handbook Gaurav Sharma ISBN 978-0-8493-0900-7 2002.Text and Photography Copyright Matt Hagadorn. The GATF encyclopedia of graphic communications. This profile is used for all subsequent scans and assures color fidelity. Column 20 to 22: undefined, producers' choiceĪfter scanning such a target, an ICC profile gets calculated on the basis of reference values. Column 17 to 19: RGB-Colors Red, Green, and Blue in different steps of brightness. Column 13 to 16: CMYK-Colors Cyan, Magenta, Yellow, and Key ( black) in different steps of brightness. Column 01 to 12: HCL color model, which differ in Hue, Chroma, and Lightness. These targets consists of 24 grey fields and 264 color fields in 22 columns: Special targets, implementing the IT8.7/1 (transparent target) or IT8.7/2 (reflective target) standards, are needed for calibrating scanners. It has a very big gamut, slightly bigger than ProPhoto RGB color space.Ĭalibrating all devices involved in the process chain (original, scanner/digital camera, monitor/printer) is required for an authentic color reproduction, because their actual color spaces differ device-specifically from the reference color spaces.Īn IT8 calibration is done with what are called IT8 targets, which are defined by the IT8 standards. This is an IT8 color target made in EGM Laboratories in Barcelona, Spain. Should be transferred with any four-color (cyan, magenta, yellow and black) halftone image files to enable a color transformation to be The purpose of this standard is to specify an input dataįile, a measurement procedure and an output data format to characterize any four-color printing process. IT8.7/3 - 1993 (R2003) Graphic technology - Input data for characterization of 4-color process printing The target that can be manufactured on any color photographic paper and is intended for use in the calibration of a photographic paper/scanner It defines the layout and colorimetric values of Products that are generally used for input to the preparatory process for printing and publishing. It is intended to address the color photographic paper IT8.7/2 - 1993 (R2003) Graphic technology - Color reflection target for input scanner calibration Ĭolor input scanner to be calibrated with any film dye set used to create the target. This standard defines the layout and colorimetric values ofĪ target that can be manufactured on any positive color transparency film and that is intended for use in the calibration of a photographic It is intended to address the color transparency products thatĪre generally used for input to the preparatory process for printing and publishing. This standard defines an input test target that will allow anyĬolor input scanner to be calibrated with any film dye set used to create the target. IT8.7/1 - 1993 (R2003) - Graphic technology - Color transmission target for input scanner calibration The information will typically consist of numerical control information used in the manufacture of dies. This standard establishes a data exchange format toĮnable transfer of numerical control information between diecutting systems and electronic prepress systems. IT8.6 - 2002 - Graphic technology - Prepress digital data exchange - Diecutting data (DDES3) The following is a list of the IT8 standards, according to the NPES Standards Blue Book: 1.4 IT8.7/3 - 1993 (R2003) Graphic technology - Input data for characterization of 4-color process printing. 1.3 IT8.7/2 - 1993 (R2003) Graphic technology - Color reflection target for input scanner calibration. 1.2 IT8.7/1 - 1993 (R2003) - Graphic technology - Color transmission target for input scanner calibration. 1.1 IT8.6 - 2002 - Graphic technology - Prepress digital data exchange - Diecutting data (DDES3).
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