Color accuracy assessment on High Dynamic Range (HDR) and Wide Color Gamut (WCG) displays has been revolutionized with the introduction of the ΔICtCp color difference metric. Traditional metrics such as ΔE have limitations when applied to these new technologies. Researchers at Dolby Laboratories evaluated various metrics against Just Noticeable Difference (JND) data and found that ΔICtCp performed the best overall. It consistently aligned with the JND data set and outperformed other metrics like ΔE00. The equation for ΔICtCp includes a scalar adjustment for the CT axis difference, necessary for manipulating the ICtCp color space. However, comparing ΔICtCp with ΔE metrics requires additional scalar modifications. A scalar of 240 on ΔICtCp equates it to the average ΔE00 result from the JND data set. The importance of ΔICtCp lies in its ability to provide a more accurate assessment of color differences on HDR and WCG displays. It is suggested as the metric for color accuracy, and further research may be needed to refine and improve color difference metrics for new display technologies.
Key Takeaways
- ΔICtCp is a new color difference metric designed for use with HDR and WCG displays.
- ΔICtCp outperforms other color difference metrics in terms of consistency with JND data.
- ΔICtCp provides a more accurate assessment of color differences compared to other metrics.
- ΔICtCp is suggested as the metric to assess color accuracy on HDR and WCG displays.
ΔICtCp Overview
The ΔICtCp color difference metric has been developed specifically for HDR and WCG displays, providing a more accurate assessment of color differences and outperforming other metrics in consistency with JND data, as discussed in the pre-existing knowledge. This metric offers a revolutionary approach to color accuracy by addressing the limitations of traditional ΔE color difference metrics in the context of HDR and WCG technology. Through extensive evaluation and comparison with other metrics such as ΔE94, ΔE00, ΔCAM02-UCS, and ΔLuv*, ΔICtCp has been found to perform the best overall, particularly in aligning with the JND data set. The metric incorporates a scalar adjustment for the CT axis difference in the ICtCp color space, which allows for a more precise and reliable measurement of color differences. By using ΔICtCp, researchers and professionals can achieve greater accuracy and consistency in color assessment for HDR and WCG displays, revolutionizing the field of color accuracy in these emerging technologies.
Comparison of Color Metrics
When evaluating color difference metrics for HDR and WCG technology, a range of metrics including ΔE94, ΔE00, ΔCAM02-UCS, ΔLuv*, and ΔICtCp were compared to assess their performance in aligning with JND data. The study found that no single metric outperformed the others for all stimuli. ΔE00, for example, over predicted color differences for the 0.1 cd/m2 data set. On the other hand, ΔICtCp demonstrated better consistency with the JND data set. This suggests that ΔICtCp is a more reliable metric for assessing color accuracy on HDR and WCG displays. It outperformed other metrics in terms of aligning with JND data and provides a more accurate assessment of color differences. Further research and evaluation may be needed to improve color difference metrics for new display technologies.
Equation for ΔICtCp
To understand the equation for ΔICtCp, it is important to consider the scalar adjustments required to manipulate the ICtCp color space and achieve comparability with the ΔE metrics. The initial equation of ΔICtCp includes a scalar of 0.25 for the CT axis difference. This scalar is necessary to manipulate the ICtCp color space. However, to revert back to a threshold space and achieve comparability with ΔE metrics, the CT axis requires a division by 2, resulting in a scalar of 0.25 when squared. Additionally, ΔICtCp and ΔE metrics have different derivation principles, requiring further scalar modifications to equate the two metrics. For example, a scalar of 240 on ΔICtCp creates equivalence with the average ΔE00 result from the JND data set. By understanding and applying these scalar adjustments, the equation for ΔICtCp can be properly utilized in assessing color accuracy on HDR and WCG displays.
Incomparability of ΔICtCp and ΔE Metrics
Through a prism of distinctive derivation principles, the worlds of ΔICtCp and ΔE metrics converge, necessitating additional scalar modifications to establish comparability. These metrics, although designed for the same purpose of assessing color differences, require adjustments to align their results. To equate ΔICtCp with the average ΔE00 result from the JND data set, a scalar of 240 is applied. Similarly, a scalar of 3 is used for both metrics to represent a Just Noticeable Difference (JND). This process ensures that the two metrics can be compared and used interchangeably, allowing for a more comprehensive analysis of color accuracy. By bridging the gap between ΔICtCp and ΔE metrics, researchers can enhance the assessment of color differences in HDR and WCG displays, leading to improved color accuracy in these innovative technologies.
Known ΔICtCp Equations
The known equations for ΔICtCp have been modified to account for scalar adjustments, ensuring comparability with other color difference metrics. These modifications are necessary because ΔICtCp and ΔE metrics have different derivation principles. To equate the two metrics, a scalar of 240 is applied to ΔICtCp, which creates equivalence with the average ΔE00 result from the JND data set. Additionally, a scalar of 3 is applied to both metrics to equate them to a just noticeable difference (JND). The equations for ΔICtCp based on the provided information can be found in Calman 2018 R3, and they have been adjusted to incorporate these scalar modifications. It is important to note that the previously mentioned additional scalar on the I axis has been redacted in these equations. These modifications ensure that ΔICtCp can be used as a reliable and comparable color difference metric for HDR and WCG displays.
Reference 1: J. Pytlarz, E. Pieri, and R. Atkins
In the field of color accuracy assessment for HDR and WCG displays, a significant contribution has been made by the research conducted by J. Pytlarz, E. Pieri, and R. Atkins, as referenced in the paper. Their work focused on objectively evaluating the color accuracy of high-dynamic-range (HDR) and wide-color-gamut (WCG) displays. This research is pivotal in understanding the performance of different color difference metrics, including the ΔICtCp metric. By comparing various metrics such as ΔE94, ΔE00, ΔCAM02-UCS, ΔLuv*, and ΔICtCp, the researchers found that ΔICtCp outperformed the others in terms of consistency with Just Noticeable Difference (JND) data. The findings of this research provide valuable insights into the application of ΔICtCp as a more accurate and reliable metric for assessing color accuracy on HDR and WCG displays.
Reference 2: J. A. Pylartz and E.G. Pieri
J. A. Pylartz and E.G. Pieri conducted research that focused on specifying color tolerances for HDR and WCG displays. Their study, titled "How Close is Close Enough? Specifying Colour Tolerances for HDR and WCG Displays," was published in IBC2017, IET Journals in September 2017. In this research, the authors addressed the need for accurate color difference metrics that can assess color variations in HDR and WCG technology. They compared various color difference metrics, including ΔICtCp, against JND data to evaluate their performance. The results showed that ΔICtCp performed well in terms of consistency with the JND data set. This research highlights the importance of ΔICtCp as a metric for assessing color accuracy on HDR and WCG displays and contributes to the ongoing efforts in refining color difference metrics for new display technologies.
Importance of ΔICtCp for HDR and WCG Technology
Elevating color assessment for cutting-edge HDR and WCG technology, a groundbreaking metric emerges, harmonizing color differentials with unrivaled precision. ΔICtCp, specifically designed for use with HDR and WCG displays, provides a more accurate evaluation of color differences compared to other metrics. Its performance surpasses that of existing color difference metrics in terms of consistency with Just Noticeable Difference (JND) data. To emphasize its significance, consider the following:
- ΔICtCp outperforms other metrics overall and aligns closely with JND data, ensuring greater color accuracy on HDR and WCG displays.
- Its consistent performance across stimuli makes it a reliable metric for assessing color differences.
- The metric’s ability to account for the unique characteristics of HDR and WCG technology enhances its effectiveness in evaluating color accuracy.
In conclusion, ΔICtCp revolutionizes color accuracy assessment for HDR and WCG displays, providing an innovative and precise solution for the evolving field of display technology.
