Creating DeviceLink profiles – Rendering

All DeviceLink profiles contains one rendering intent. In addition to the standard rendering intents – Perceptual, Relative Colorimetric, Saturation and Absolute Colorimetric – CoPrA offers six additional methods. The methods can be merged and the overall chroma can be merged. Merging allows adjustment for specific applications.

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.

Blackpoint Compensation: Mostly 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.

Dynamic Compression: Compares the source color space with the target color space and generates a compression that minimizes out-of-gamut areas. This setting preserves the brightness – and therefore image definition – of the original color space while reducing the saturation. As for the Standard Compression, the gray axis of the conversion is build relative to the paper white of the target profile.

Absolute Compression: 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.

Minimum Compression: 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. When using 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: The absolute colorimetric rendering intent, ensures 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.

Minimum White Compression: Similar to Minimum Compression. Both rendering intents compress the white point without paper simulation.

Comparison methods:
The Minimum Compression is a rather perceptual rendering that additionally compresses the black point so maximum dynamic range is utilized without loss of detail in the shadows. In contrast, the Minimum White Compression compresses the white point but not the black point, so a close match between source and target color spaces can be achieved. This can be useful for the color representation across various media, color matching or printing on slightly differing media. It can be regarded as close to absolute colorimetric rendering.

Additional Options
Merge: To use two rendering methods, merge them in defined proportions when creating the DeviceLink profile. For instance, if you choose the combination Standard Compression (1st selection, left) and Absolute Compression (2nd selection, right) and set the Merge slider to 75, the corresponding proportions of the two rendering methods are used in the DeviceLink profile when converting files. In this example the gray axis would be 75% adapted to the paper color, without paper color simulation in the highlights and with simultaneous adaptation of the contrast range in the highlights and shadows.

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.

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