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2. Neutral-density filter - Wikipedia

   en.wikipedia.org/wiki/Neutral-density_filter

   In photography and optics, a neutral-density filter, or ND filter, is a filter that reduces or modifies the intensity of all wavelengths, or colors, of light equally, giving no changes in hue of color rendition. It can be a colorless (clear) or grey filter, and is denoted by Wratten number 96. The purpose of a standard photographic neutral ...

3. Color balance - Wikipedia

   en.wikipedia.org/wiki/Color_balance

   The color balance operations in popular image editing applications usually operate directly on the red, green, and blue channel pixel values, [1] [2] without respect to any color sensing or reproduction model. In film photography, color balance is typically achieved by using color correction filters over the lights or on the camera lens. [3]

4. Unisex public toilet - Wikipedia

   en.wikipedia.org/wiki/Unisex_public_toilet

   Unisex public toilets may either replace single-sex toilets, or may be an addition to single-sex toilets. Unisex public toilets can be used by people of any sex or gender identity. Such toilet facilities can benefit transgender populations and people outside of the gender binary, and can reduce bathroom queues through more balanced occupation.