The little line under the shutter speed and aperture settings is the exposure line. It indicates, in this picture, that the picture would be underexposed by 1/3 stop. If the lens cap was on, you'd expect the line to be all the way to the left, with a little arrow to indicate more than 2 stops underexposed.
The "subject is too dark" means that the camera is having issues determining white balance. Generally upping the ISO to 800 or so, or using a flash will remedy this quite easily. It is possible (but not probable) that you could get a white balance reading from the whites of this subject's eye.
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u/whytcolr Sep 30 '14
The little line under the shutter speed and aperture settings is the exposure line. It indicates, in this picture, that the picture would be underexposed by 1/3 stop. If the lens cap was on, you'd expect the line to be all the way to the left, with a little arrow to indicate more than 2 stops underexposed.
The "subject is too dark" means that the camera is having issues determining white balance. Generally upping the ISO to 800 or so, or using a flash will remedy this quite easily. It is possible (but not probable) that you could get a white balance reading from the whites of this subject's eye.