Final answer:
The difference between the white levels of an image and a viewer's work surface should be balanced and not too bright or too dark compared to the image.
Step-by-step explanation:
The difference between the white levels of an image and a viewer's work surface, or task area, should be within a range that is neither too bright nor too dark compared to the white image. If the white levels on the task area are too bright, it can cause eye strain and make it difficult to view the image properly. On the other hand, if the white levels on the task area are too dark, it can create a noticeable contrast difference between the image and the surroundings.
For example, if the white levels of the image are high-keyed, meaning they are lighter, it would be better to have a task area that is also high-keyed or slightly darker than the image. This ensures that the overall visual experience is comfortable and balanced. However, if the white levels of the image are low-keyed, meaning they are darker, it would be better to have a task area that is also low-keyed or slightly brighter than the image.