Tasks

Initialization

• – initWithValues:

  Initializes a color matrix with an array of 20 floats. Designated Initializer.

• – init

  Initializes an identity matrix.

• + colorMatrixWithValues:

  Factory method.

• + colorMatrixWithIdentity

  Factory method.

Methods

• – invert

  Inverts the colors.

• – adjustSaturation:

  Changes the saturation. Typical values are in the range [-1, 1]. Values above zero will raise, values below zero will reduce the saturation. ‘-1’ will produce a grayscale image.

• – adjustContrast:

  Changes the contrast. Typical values are in the range [-1, 1]. Values above zero will raise, values below zero will reduce the contrast.

• – adjustBrightness:

  Changes the brightness. Typical values are in the range [-1, 1]. Values above zero will make the image brighter, values below zero will make it darker.

• – adjustHue:

  Changes the hue. Typical values are in the range [-1, 1].

• – identity

  Changes the color matrix into an identity matrix.

• – concatColorMatrix:

  Concatenates the receiving color matrix with another one.

Properties

•   values

  Returns a point to the internal color matrix array.

  property
•   numValues

  Returns the count of values (always 20).

  property