Transforming with a gamma function

Overview

Gamma correction functions correct the brightness profile of an image by applying an exponent to each pixel in an image. The piecewise gamma correction functions allow you to add a linear transformation to pixels below a certain boundary. You can use gamma correction functions to prepare an image to display or print on a particular device.

Topics

Applying a gamma function

• vImageCreateGammaFunction(_:_:_:)
• Gamma function types
• vImageGamma_Planar8toPlanarF(_:_:_:_:)
• vImageGamma_PlanarFtoPlanar8(_:_:_:_:)
• vImageGamma_PlanarF(_:_:_:_:)
• vImageDestroyGammaFunction(_:)
• Adjusting saturation and applying tone mapping

Applying a piecewise gamma function

• Adjusting the brightness and contrast of an image
• vImagePiecewiseGamma_Planar8(_:_:_:_:_:_:_:)
• vImagePiecewiseGamma_Planar8toPlanar16Q12(_:_:_:_:_:_:_:)
• vImagePiecewiseGamma_Planar8toPlanarF(_:_:_:_:_:_:_:)
• vImagePiecewiseGamma_Planar16Q12(_:_:_:_:_:_:_:)
• vImagePiecewiseGamma_Planar16Q12toPlanar8(_:_:_:_:_:_:_:)
• vImagePiecewiseGamma_PlanarF(_:_:_:_:_:_:_:)
• vImagePiecewiseGamma_PlanarFtoPlanar8(_:_:_:_:_:_:_:)

Applying a symmetric piecewise gamma function

• vImageSymmetricPiecewiseGamma_Planar16Q12(_:_:_:_:_:_:_:)
• vImageSymmetricPiecewiseGamma_PlanarF(_:_:_:_:_:_:_:)

See Also

Applying color transforms to images

• Transforming with lookup tables
• Transforming with polynomials
• Transforming with matrix multiplication
• Applying a flood fill to an image