Bug report

Bug summary
When colors passed to a plot are provided as tuples in the range[0, 255] instead of[0, 1], the error raised relates to the shape of the data (which is correct), not the values of the data.

Code for reproduction

importmatplotlib.pyplotaspltplt.scatter([0,1], [0,1],c=[(255,0,0), (0,255,0)])

Actual outcome

ValueError:'c'argumenthas2elements,whichisnotacceptableforusewith'x'withsize2,'y'withsize2.

Edit:

ValueError:RGBAvaluesshouldbewithin0-1range

is also raised, however it is less prominent than the "size" error, which should not be raised at all

Expected outcome
A single, specific error message:

ValueError:RGBAvaluesshouldbewithin0-1range

Matplotlib version

• Operating system: Windows 10
• Matplotlib version: 3.1.2
• Matplotlib backend: Qt5Agg
• Python version: 3.7.3

Installed matplotlib from conda