Sandwich printing is a non-digital

photographic technique Photography is the art, application, and practice of creating durable images by recording light, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film. It is employed ...

which combines two negatives or

transparencies A transparency, also known variously as a viewfoil, foil, or viewgraph, is a thin sheet of transparency (optics), transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn. These are then ...

into a single image.

Procedure

"Sandwiching" may be accomplished by putting one original image on top of the other, placing them into the film carrier of an

enlarger An enlarger is a specialized transparency projector used to produce photographic prints from film or glass negatives, or from transparencies. Construction All enlargers consist of a light source, normally an incandescent light bulb shining thou ...

, and printing on one sheet of paper. It may also be accomplished by placing the two "sandwiched" originals in a frame on the surface of a lightbox and taking a third photograph of the combination. Sandwich printing is generally used to create a combination of image elements that would not occur naturally in the world. This technique may be used with either

black and white Black-and-white (B&W or B/W) images combine black and white in a continuous spectrum, producing a range of shades of grey. Media The history of various visual media began with black and white, and as technology improved, altered to color. ...

color Color (American English) or colour (British English) is the visual perceptual property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physical specifications of color are associ ...

images. When film negatives are used, one image will appear in the shadows of the other image. This occurs as a result of the shadow areas being less

dense Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematically ...

than the highlighted areas of a negative. The more underexposed the shadows, the more clearly the image from the other negative will shine through. The opposite occurs when using transparencies. The darker area of one image appears in the highlighted and pale areas of the other image.

References

Digital photography Photographic techniques {{printmaking-stub

Procedure

See also

References