Comment 4 for bug 438786

Michael , we have fixed all those issues of less contrast. Pls check the lp:humanity .
You have filed a bug in the upstream Humanity project where this bug is already fixed. Hence fix released.
But the new icons have not yet been updated in Ubuntu.

This new update will arrive after beta release , where Humanity will be available in 2 themes ,
Humanity > Sufficient contrast for light panels
Humanity-Dark > sufficient contrast for dark panels

So this issue is fixed.