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2. Transparency (graphic) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(graphic)

   This image has binary transparency (some pixels fully transparent, other pixels fully opaque). It can be transparent against any background because it is monochrome. One color entry in a single GIF or PNG image's palette can be defined as "transparent" rather than an actual color.

3. Barrier-grid animation and stereography - Wikipedia

   en.wikipedia.org/wiki/Barrier-grid_animation_and...

   Alternating strips from the left and right image of a traditional stereoscopic negative had to be recomposed as an interlaced image, preferably during the printing of the image on paper. A glass plate with opaque lines had to be fixed in front of the interlaced print with a few millimeters in between, so the lines on the screen formed a ...

4. Opaque projector - Wikipedia

   en.wikipedia.org/wiki/Opaque_projector

   The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope , which is a projector used for projecting images of transparent objects (such as films), and from the epidiascope , which is capable of projecting images of both ...

5. Alpha compositing - Wikipedia

   en.wikipedia.org/wiki/Alpha_compositing

   A value of 1 means that the pixel is fully opaque. With the existence of an alpha channel, it is possible to express compositing image operations using a compositing algebra. For example, given two images A and B, the most common compositing operation is to combine the images so that A appears in the foreground and B appears in

6. Transparency (projection) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(projection)

   Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.

7. Dodging and burning - Wikipedia

   en.wikipedia.org/wiki/Dodging_and_burning

   A card or other opaque object is held between the enlarger lens and the photographic paper in such a way as to block light from the portion of the scene to be lightened. Since the technique is used with a negative-to-positive process, reducing the amount of light results in a lighter image.