So, I took this shot indoors (bright sunny outside) using on a Nikon D5200 with A priority and Auto ISO:
Photo looks ok when zoomed out. But when I zoom 1:1 in LightRoom, I see some blue specks in the photograph (bottom right) and also a very grainy picture.
Camera settings were as below:
I read somewhere that the graininess/noise could be an artifact of high ISO (1600). Is that true? Also, what could be causing the blue specs? What range of ISO would be optimal for this kind of indoor shoot?
Is there a filter available in Lr for removing this noise?
UPDATE: Those blue specs disappear with the Luminance (Develop->Detail->Noise Reduction) set to a value of 40.