| Text Graphics HDR/SDR Error | |
| Display Text | Text Graphics HDR/SDR Error |
| Description |
"Text Graphics HDR/SDR Error” applies to potential issues with SDR text graphics inserted into a native HDR finish. Graphics may either skew the Dolby Vision analysis or are omitted from the analysis inadvertently. The resulting final output then includes text graphics that peak significantly above the creatively intended nit level of the rest of the content in the Dolby Vision output. It may also apply when color grading values are improperly copied from graphics with very different background/surrounding scene elements. The resulting final output then includes text graphics that have inconsistent color across different scenes (e.g. text graphic appears “grey” or “washed out” compared to similar instances in other shots appearing “white”). |
| Impact | Text Graphics HDR/SDR errors can potentially lead to an inconsistent member experience. The Dolby Vision analysis will be inaccurate if SDR text graphics are not properly incorporated into and analyzed as part of the native HDR content. The same is true when color grading values are not adjusted based on the context of the surrounding elements in the scene to ensure visual color consistency in the text graphics. |
| Severity Assessment Guidance | |
| FYI | N/A |
| Issue | Text graphics appear overly bright with HDR luminance levels peaking significantly above the MaxFALL of the content, in some cases pushing 10,000 nits. Alternatively, some text graphics appear “grey” or “washed out” compared to similar graphics in other scenes. |
| Blocker | N/A |
| Solutions | |
| How to Prevent |
Adhere to Dolby best practices when managing text graphics created either in online or supplied separately from a title/graphics house. Regardless of where text graphics are generated, color of the text graphics should be adjusted within the context of the HDR background. The Dolby Vision analysis should be run on a “compound clip” of the text graphics and the background image. Once the analysis completes, switch scopes to SDR, and preview the tone mapped version to ensure the text graphics luminance is consistent between the HDR and SDR derived outputs. Additionally, it’s recommended that the HDR output be monitored for compliance with the Mastering display peak luminance setting. |
| How to Fix | Return to online and adjust color of the text graphics as needed within the context of the HDR background. If not done previously, create a “compound clip” of the text graphic and background image, and run the Dolby Vision analysis on this “compound clip”. Switch scopes to SDR and preview the tone mapped version to ensure the text graphics luminance is now consistent between the HDR and SDR derived outputs. |