[Metric] Opacity is ignored when passed as RGBA or HEX string

[dej611]

Describe the issue

Kibana Cross Issues
elastic/kibana#167636

[nickofthyme]

This is due to the contrast logic, it's hard to accurately determine color contrast when an alpha values is present.

I think in the short-term we just disable the alpha assignment in the eui color picker, if practicable in lens, for assigning metric color.

I believe we had a similar issue with the partition chart slices a while back. Now I we just blend the foreground color with the background color to run contrast logic.

Notice in here it accurately chooses the text color and applies the opacity.

[dej611]

I believe we had a similar issue with the partition chart slices a while back. Now I we just blend the foreground color with the background color to run contrast logic.

Wouldn't be possible to apply the same logic in there as well?
I think such logic should be commonly shared across all chart types.

Disabling the opacity in Lens may not be desiderable, as it breaks the consistency of the palette interface across chart types.

[nickofthyme]

Wouldn't be possible to apply the same logic in there as well?

Yeah totally, I think that is the best solution here I don't think it will be too difficult.

Disabling the opacity in Lens may not be desiderable, as it breaks the consistency of the palette interface across chart types.

Ah gotcha, then just disregard this idea. 👍🏼