Printer Profiling: Perceptual Rendering

For printer profiling, CoPrA offers various methods in relation to the perception-oriented rendering intent under Customize/General/Perceptual Rendering:

Standard Compression: ColorLogic’s standard method, which is well suited for most applications. Neutral tones are converted using the relative colorimetric intent. If the paper white of the used printing medium is significantly more yellow than the reference, the gray axis will accordingly look more yellow, too.

Black Point Compensation: This method largely corresponds to the relative colorimetric intent with black point compensation of Adobe products. When converting CMYK data in printing systems, the image definition in the highlights and shadows is preserved while a loss of definition in areas of highly saturated colors is avoided. Neutral tones are converted using the relative colorimetric intent.

Absolute Compression: This method is largely similar to the absolute colorimetric intent. The contrast range in the highlights and shadows is adapted to avoid any loss of image definition. The rendering of neutral colors is also based on absolute colorimetric rendering without paper color simulation in the highlights.

Minimal Compression: This method is based on the absolute colorimetric intent and only compensates close to the black and the white point. This results in maximum shadows and a preserved image definition while the paper white will not be simulated. Use this rendering intent if you would like to achieve a very close reproduction, for example when using print standards like ISO Coated V2 or GRACoL2006 Coated1v2 on a digital device. If you use a printer profile in your ICC-compliant software that has been generated with one of ColorLogic’s own rendering intents, select the perceptual rendering intent.

Note: As for the absolute colorimetric rendering intent, ensure that the target color space is larger or has at least a similar size to avoid any loss of image definition. For color conversions from larger to smaller color spaces use Absolute Compression to maintain the gray balance of the source color space.

The drop down menu containing the Rendering options allows changes to the overall Chroma, Lightness or Saturation of the profile using a slider. Chroma can be used to reduce or increase the chroma of highly saturated colors in the range between -20 and +20. Saturation can be used when highly saturated colors are required. As with the Chroma option, the gray balance is not effected when moving the slider. It is recommended to use Saturation for large color spaces such as gamut extending Multicolor in order to achieve more brilliant colors.

Note: ColorLogic intentionally keeps the chroma effect moderate. However, when increasing the chroma, ensure that the setting neither causes a loss of image definition in highly saturated colors, nor adversely affects colors such as skin tones.

Note: The effect of each of these options is shown in the gamut graph on the right. Increasing the saturation results in higher chroma and lower lightness, so more saturation will slightly darken the colors and they will appear more vibrant. In contrast, more chroma can result in high chroma colors being out-of-gamut and these colors would not be rendered by the given profile.

This entry was posted in CoPrA4, General settings, Printer Profiling. Bookmark the permalink. Trackbacks are closed, but you can post a comment.

Post a comment and download files

You must be logged in to post a comment and/or to download files.