Sayak_Paul:




 Robert_Crowe:


Do the pixels have a minimum level of variance (for example, did we take the lens cap off?)



Could you expand a bit more on this? I agree with the rest of the points mentioned for validation. Checking for format corruption might be another good addition.


What I meant was that a bad image can have very little hue and value variance, which is the case if the lens cap is on, or I take a very out of focus image like when things are way too close, or an image with not nearly enough light, or an image of the sun, or an image of the inside of my pocket, etc.