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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unhelpful ValueError raised when color array is incorrect format","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\nWhen 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.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\n\r\nplt.scatter([0, 1], [0, 1], c=[(255, 0, 0), (0, 255, 0)])\r\n```\r\n\r\n**Actual outcome**\r\n\r\n```python\r\nValueError: 'c' argument has 2 elements, which is not acceptable for use with 'x' with size 2, 'y' with size 2.\r\n```\r\n\r\n_Edit_:\r\n```python\r\nValueError: RGBA values should be within 0-1 range\r\n```\r\nis also raised, however it is less prominent than the \"size\" error, which should not be raised at all\r\n\r\n**Expected outcome**\r\nA single, specific error message:\r\n```python\r\nValueError: RGBA values should be within 0-1 range\r\n```\r\n\r\n**Matplotlib version**\r\n  * Operating system: Windows 10\r\n  * Matplotlib version: 3.1.2\r\n  * Matplotlib backend: Qt5Agg\r\n  * Python version: 3.7.3\r\n\r\nInstalled matplotlib from conda\r\n\r\n","author":{"url":"https://github.com/TTitcombe","@type":"Person","name":"TTitcombe"},"datePublished":"2019-11-19T10:47:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/15727/matplotlib/issues/15727"}