Thanks to a suggestion by @iannesbitt, we also changed the spectrogram color pallet to be more color-blind user friendly. It also helps those of us that can see the full spectrum.
The old spectrogram used a rainbow color scale, which now known to be ineffective at conveying numeric information properly, and virtually impossible to read for most colorblind users. @kwinkunks shared this image of a colorized LiDAR elevation dataset on Twitter not long ago, which is a good demonstration of how rainbow colormaps distort our visual perception of data:
Both colorblind and non-colorblind viewers will notice that the two right-hand color scales are more difficult to interpret in the blue and green bands, while those on the left convey stunning detail of abandoned river meanders in those same areas. This is because, in essence, the brightness of the image does not vary co-linearly with hue, and human eyes are much more attuned to perceive dark/light differences than differences in hue.
In light of this, we changed spectrogram color scale to something perceptually uniform and linear. You can read about perceptual uniformity/linearity here.
branden & ian