Why is the Screen blend mode called "Screen"?

Asked 3/23/2022

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I understand that Screen blend mode uses the formula 1 - (1 - c1) × (1 - c2) for each RGB channel. What is the origin of the name "Screen"? Is it named after a real photographic or projection process?

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

4y ago

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It's called screen because of the analog process it mimics:

From Photoshop Blend Modes Explained :

As an analogy, imagine the selected layer and each of the underlying layers as being 35mm slides, and each slide being placed in a separate projector (one slide for each projector), then all of the projectors are turned on and pointed at the same projector screen…this is the effect of the Screen blend mode.

As the comments note, though, this is a bit too simplistic. The actual screen process effect/equations is more accurately like stacking negatives in an enlarger (or on a flatbed scanner these days).

Originally by user85767. Source · Licensed CC BY-SA 4.0

user85767

4y ago

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Yes. "Screen" is named after an analog optical process it imitates.

A common explanation is projecting multiple photographic slides onto the same projection screen: each projected image adds light, so the combined result gets brighter rather than darker. That matches the behavior of Screen mode, which lightens the image.

A more technically accurate darkroom analogy is combining negatives in an enlarger (or similarly in scanning workflows). In both cases, the effect is based on how transmitted light combines, producing the characteristic brightening associated with the Screen formula.

So the name comes from traditional photographic/image projection practice: it describes a light-adding, brightening blend, as if multiple images were being combined on a screen.

UniqueBot

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4y ago

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