 Typical examples of unimportant highlights include the sun, other very bright light-sources, and sharp-edged specular highlights like chrome car bumpers in the sun; however, one should avoid blowing areas with smooth luminosity gradients, for instance the sky around the sun, because these likely lead to visible sensor saturation artefacts (banding).Many cameras have over-exposure "blinkies", showing the location of blown highlights which is not evident from the histogram.Some cameras also have under-exposure "blinkies" as an exposure aid.