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UNSHARP MASK [2 records]

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Alphabetical list of terms

Record 1 2007-01-11

English

Subject field(s)
  • Computer Graphics
DEF

A technique used to make scanned images sharper.

OBS

The process of scanning an image can make the image appear soft; high-end drum scanners perform unsharp masking automatically to create a sharper, crisper image. Flatbed scanners usually do not perform unsharp masking. Image editing applications such as Adobe Photoshop can be used to unsharp mask an image.(The name "unsharp masking" comes from the pre-computer photographic process used to sharpen a blurry negative.)

French

Domaine(s)
  • Infographie
DEF

[Technique de] manipulation électronique de l'image [utilisée] pour en augmenter le détail et le contraste en réduisant la densité du bord clair et en augmentant le bord foncé.

OBS

masquage flou : Terme et définition tirés du Vocabulaire du prépresse de France Brodeur. Reproduction autorisée par l'Institut des communications graphiques du Québec.

Spanish

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Record 2 1999-03-24

English

Subject field(s)
  • Photography
CONT

A mask is a thin black and white negative made from a transparency. It has no density in areas corresponding to the densest areas of the transparency. The mask is sandwiched together with the transparency to reduce the overall contrast or density range of a transparency while printing. An unsharp mask also increases sharpness at light/dark edges in the print. The light/dark edges of an unsharp mask are fuzzy so there is a ramp transition from light to dark. The corresponding edges in the transparency are sharp. When you sandwich them together aligning the images, the fuzzy mask edge is ramping where the sharp transparency edge is stepping.

French

Domaine(s)
  • Photographie
DEF

Masque que l'on superpose à un phototype original afin d'accentuer la netteté et l'effet de bord.

Spanish

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