Created attachment 197483 [details] Spreadsheet with a pie chart in a variety of slice colors If we take a chart with areas in different colors, and add data labels, they will typically be located on the colored areas of the chart (e.g. slices of a pie); and - their color will be black. Technically, the color is "automatic", but effectively, it's always (?) black. As an example: 1. Open the attached document 2. Double-click the pie chart to enter it 3. On the menu, choose Insert > Data Labels... 4. Toggle "Value as Number" Expected results: Labels are set so as to be visible with reasonable contrast in all pie slices (e.g. using different colors, or some auto-enabled effect such as a different-color vignette, or shadow, or glow, or outline). Actual results: Labels are all set in black color, for both light and very-dark backgrounds. This is true specifically for the black-colored pie slice, where the label is completely invisible.
Phrased differently, the automatic color of data labels should consider not just the labels as objects but other objects underneath them.
Yes, the data label should consider the actual background for automatic light/dark.
(In reply to Heiko Tietze from comment #2) > Yes, the data label should consider the actual background for automatic > light/dark. So, that would be an improvement in terms of readability. But we do need to consider that occasional white rather than black labels is a bit of an eyesore. Ideally, I would prefer a way in which the labels would all look the same, _and_ have contrast. So, something like a surrounding effect would have been better. And still, as long as they have automatic color - it needs to consider the backgroud.