Jisho

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Noun
1. blue screen (for chroma keying)Wasei, word made in Japan, From English “blue back”. Wasei (word made in Japan)
Noun
2. Blue Screen of Death (Windows error screen)Computing, See also ブルースクリーン
Noun
3. blaubok (extinct antelope); bluebuck; blue antelopeOnly applies to ブルーバック
Wikipedia definition
4. Chroma keyChroma key compositing, or chroma keying, is a special effects / post-production technique for compositing (layering) two images or video streams together, used heavily in many fields to remove a background from the subject of a photo or video - particularly the newscasting, motion picture and videogame industries. A color range in the top layer is made transparent, revealing another image behind. The chroma keying technique is commonly used in video production and post-production.
Read “Chroma key” on English Wikipedia
Read “ブルーバック” on Japanese Wikipedia
Read “Chroma key” on DBpedia
Other forms
ブルー・バック

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