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it is a bug as the behavior got broken but it is still doing the right thing: 8UC3 just tells you your image has 3 channels that are uint8. There is absolutely no color information in there: it could be RGB, BGR, YUV .... It therefore does not make sense to convert it to a color coded format.

Then again, 1.8.5 restores that behavior (it assumes 8UC3 is RGB). Groovy will throw that message again (but camera_pose_calibration will be fixed then).

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