Summary

MPL 3 introduces minorticks on Colorbar. These are enabled by default for LogNorm.

If the user sets custom tick marks for LogNorm, the minor ticks become confusing in my opinion.

Example

fig, ax = plt.subplots()

data = np.clip(randn(250, 250)*1000, 0, 1000)

cax = ax.imshow(data, norm=mpl.colors.LogNorm(vmin=1, vmax=1000))
cbar = fig.colorbar(cax, format='%d')
cbar.set_ticks([5, 50, 500])

Which produces,

Discussion

There is already the method Colorbar.minorticks_off, however it has a check that if the axis is log, then do nothing.

Request

The minor tickmarks add confusion here in my opinion. Can we have the option to turn them off via the existing Colorbar.minorticks_off?