Mottle

mottle (ink)
blotchy, spotty, or uneven appearance of printed image, most pronounced in solid areas.

Step 7: Mottled or Blurred Light
Bright sunlit patches or blurred lights can make for a very pleasing background. Mottled sunlight can spell disaster when it falls on your subject's face or even body if you're not using it intentionally.

Graininess - a mottled effect in the negative
Burning - in adding light to certain parts of the image by extra exposure while the rest of the image is protected from the enlarger light ...

(PIA) MOTTLE-A photographic defect characterized by nonuniform density differences; usually in the pattern of tiny, circular areas. MOUNT, BAYONET-A means of quickly attaching or removing a lens or filter by turning through only part of a revolution.

There is uneven or mottled light on the subject's face that will look funny in the finished photograph.
The background of your image is very bright, but your subject is not.

I sometimes use a mottled backdrop, which I simply drape over a chair. But you could just as easily use a piece of material or a sheet.

The tank features 850 species of BC marine-life like rare quillback and vermillion rockfish, fish-eating anemones, and mottled sea stars; upstairs, a smaller cylindrical tank holds more than 100 undulating moon jellyfish.

Next, I added two different shades of blue gel to each of the rim lights for a color-mottled effect. I kept the main light with the OctoDome® and the light on the background un-gelled, though, as too many gelled lights can be overkill.

Such surface imperfections can cause nonuniform illumination of the print and a mottled appearance in the second development zones. Therefore agitation should be ceased during the last few seconds of the first development.

The 60 Bag is a shopping bag that biodegrades in 60 days. The bold colors and modern typography appeals to younger audiences who tend to consider the mottled brown of most recyclable or biodegradable fiber products as unfashionable.
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Digital noise looks a lot like film grain and can give an image a speckled or mottled look. Higher ISO rated film produces relationally more noise then lower ISO rated film.

even rotating the soft box to different angles to try and make the reflection look more natural, but it invariably just ended up looking like a white square stuck onto the surface of the teapot. And since the finish of the teapot was slightly mottled, ...

Protect all your lenses with a UV filter, cap and leash, but polarizers are often not so relevant for wide-angle lenses because the angle of polarization changes across the sky and will give it an odd mottled appearance, ...

See also: Image, Light, Camera, Color, Photograph