Technologies›Graphics, Imaging & Compositing

ImageIO

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ImageIO reads, writes, animates, and inspects image data and metadata across many file formats. You decode and incrementally load images with CGImageSource, tracking progress through CGImageSourceStatus, and encode images to a destination format with CGImageDestination. For metadata, you read and build tag collections using CGImageMetadata and CGMutableImageMetadata, where each entry is a CGImageMetadataTag classified by CGImageMetadataType, and you drive animated image playback through CGImageAnimationStatus.

Reading Images 2

Decode and incrementally load images from a data source while tracking progress.

  • Cl
    CGImageSource
    An opaque type that you use to read image data from a URL, data object, or data consumer.
  • En
    CGImageSourceStatus
    The set of status values for images and image sources.

Writing Images 1

Encode and write images to a destination in a chosen file format.

  • Cl
    CGImageDestination
    An opaque type that you use to write image data to a URL, data object, or data consumer.

Image Metadata 5

Read, build, and classify the metadata tags attached to an image.

  • Cl
    CGImageMetadata
    An immutable object that contains the XMP metadata associated with an image.
  • Cl
    CGMutableImageMetadata
    An opaque type for adding or modifying image metadata.
  • Cl
    CGImageMetadataTag
    An immutable type that contains information about a single piece of image metadata.
  • En
    CGImageMetadataType
    Constants that indicate the XMP type for a metadata tag.
  • En
    CGImageMetadataErrors
    Constants for errors that occur when getting or setting metadata information.

Animated Images 1

Drive playback of multi-frame, animated image sources.

  • En
    CGImageAnimationStatus
    Constants that indicate the result of animating an image sequence.

Enumerations 2

  • En
    CGImagePropertyOrientation
    A value describing the intended display orientation for an image.
  • En
    CGImagePropertyTGACompression
    Possible values for ``kCGImagePropertyTGACompression``.

Type Aliases 2

  • Ty
    CGImageSourceAnimationBlock
    The block to execute for each frame of an image animation.
  • Ty
    CGImageMetadataTagBlock
    The block to execute when enumerating the tags of a metadata object.
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