It does not appear that the current colormaps used are perceptually uniform. This tends to create artificial visual artifacts when looking at the heatmaps. For example, if you look between 69F and 72F, there seems to be a big "visual" change. However between 72F and 75F, there is a much less change. A perceptually uniform heatmap would not have this issue.

@dzuremar Can we have an option to pick where these subgradients occur and have the option for the subgradients to use a perceptually uniform colormap? For me at least, I can see 100F to be useful subgradient, but I would prefer something uniform in between. The reason for this is it makes it easier to determine "how much" colder or warmer a location is by just looking at the color instead of having to track down the actual numbers. This is not easily doable if the colormap is not perceptually uniform.

It does not appear that the current colormaps used are perceptually uniform. This tends to create artificial visual artifacts when looking at the heatmaps. For example, if you look between 69F and 72F, there seems to be a big "visual" change. However between 72F and 75F, there is a much less change. A perceptually uniform heatmap would not have this issue.