G7
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| + | G7® is a Specification defined by the Print Properties and Colorimetrics Working Group of IDEAlliance. | ||
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'''G7''' is a method for matching color across multiple printing devices, such as printing presses and proofing systems. It can be applied to any printer that has a calibration process (usually involving adjusting color "curves" in a RIP) that allows control over CMYK inks. These would include web presses, sheet-fed presses, proofing systems, inkjet printers being driven by RIPs. The goal of G7 is to provide visually consistent, repeatable color between different devices (like proofers and printers) as well as different presses, and even different facilities. The emphasis in this specification is on gray balance. Since human vision sees differences in gray more readily than more saturated colors, this specification is more likely to result in successful visual "matching" than merely matching solid ink densities which is typically done for more traditional standards. | '''G7''' is a method for matching color across multiple printing devices, such as printing presses and proofing systems. It can be applied to any printer that has a calibration process (usually involving adjusting color "curves" in a RIP) that allows control over CMYK inks. These would include web presses, sheet-fed presses, proofing systems, inkjet printers being driven by RIPs. The goal of G7 is to provide visually consistent, repeatable color between different devices (like proofers and printers) as well as different presses, and even different facilities. The emphasis in this specification is on gray balance. Since human vision sees differences in gray more readily than more saturated colors, this specification is more likely to result in successful visual "matching" than merely matching solid ink densities which is typically done for more traditional standards. | ||
| - | The G7 specification is managed by IDEAlliance | + | Note that G7 is a ''specification'' - not a standard. As such it can be used in addition to (rather than 'in place of') other industry printing standards such as SWOP, or GRACoL. |
| + | |||
| + | ====From the IDEAlliance website==== | ||
| + | |||
| + | G7® specifies the components of an image that define a similar "visual appearance" to the human eye. To do this, the G7 Specification: | ||
| + | * defines a colormetric definition for gray balance | ||
| + | * specifies gray balance in the midtones, image weight and image contrast from the highlights to the shadows are the factors that determine likeness of the visual appearance of an image. | ||
| + | |||
| + | ===History=== | ||
| + | |||
| + | Initially G7 was developed by the IDEAlliance GRACoL Working Group. But as adoption of G7 grew, it became clear that the application of this specification that enables printers to reproduce a similar visual appearance across printing types and substrates should be addressed by a group with reach beyond the focus on sheetfed offset printing that is unique to the GRACoL working group. Today, through the PPC Working Group, experts from across the spectrum of printing disciplines contribute to this important IDEAlliance Specification. | ||
| + | |||
| + | ===How to get it=== | ||
| + | |||
| + | The G7 specification is managed by [[IDEAlliance]] | ||
| + | :A "How to" document is available here: | ||
| + | |||
| + | :and an updated amendment for the "How to" is here: | ||
| + | [[http://www.idealliance.org/industry_resources/branding_media_and_color/g7_how_to_training_guide/amendments_to_g7_how_to_v6|Amendments to G7 How to]] | ||
| + | |||
| + | A list of downloadable G7 documents is here: | ||
| + | [[http://www.idealliance.org/industry_resources/branding_media_and_color/gracol]] | ||
| + | Software that | ||
Revision as of 19:59, 13 May 2009
G7® is a Specification defined by the Print Properties and Colorimetrics Working Group of IDEAlliance.
G7 is a method for matching color across multiple printing devices, such as printing presses and proofing systems. It can be applied to any printer that has a calibration process (usually involving adjusting color "curves" in a RIP) that allows control over CMYK inks. These would include web presses, sheet-fed presses, proofing systems, inkjet printers being driven by RIPs. The goal of G7 is to provide visually consistent, repeatable color between different devices (like proofers and printers) as well as different presses, and even different facilities. The emphasis in this specification is on gray balance. Since human vision sees differences in gray more readily than more saturated colors, this specification is more likely to result in successful visual "matching" than merely matching solid ink densities which is typically done for more traditional standards.
Note that G7 is a specification - not a standard. As such it can be used in addition to (rather than 'in place of') other industry printing standards such as SWOP, or GRACoL.
From the IDEAlliance website
G7® specifies the components of an image that define a similar "visual appearance" to the human eye. To do this, the G7 Specification:
- defines a colormetric definition for gray balance
- specifies gray balance in the midtones, image weight and image contrast from the highlights to the shadows are the factors that determine likeness of the visual appearance of an image.
History
Initially G7 was developed by the IDEAlliance GRACoL Working Group. But as adoption of G7 grew, it became clear that the application of this specification that enables printers to reproduce a similar visual appearance across printing types and substrates should be addressed by a group with reach beyond the focus on sheetfed offset printing that is unique to the GRACoL working group. Today, through the PPC Working Group, experts from across the spectrum of printing disciplines contribute to this important IDEAlliance Specification.
How to get it
The G7 specification is managed by IDEAlliance
- A "How to" document is available here:
- and an updated amendment for the "How to" is here:
A list of downloadable G7 documents is here: [[1]]
Software that
