JpegExtendedParams Object (IJpegExtendedParams Interface)

This object provides functionality for tuning the parameters of saving an image to JPEG format (IFF_JpegGrayJfif, IFF_JpegColorJfif, IFF_Jpeg2kGray, IFF_Jpeg2kColor, IFF_TiffGrayJpegJfif and IFF_TiffColorJpegJfif image format types) using the IImage::WriteToFile method. A pointer to this object is passed into the IImage::WriteToFile method as an input parameter, and thus affects the size and quality of the resulting image. All properties of a newly created object of this type are set to reasonable defaults. See the description of particular property for its default value.

The JpegExtendedParams object is a persistent object. This means that the object's current state can be written to persistent storage: an area in the global memory or a disk file. Later, the object can be re-created by reading the object's state from persistent storage. The following methods provide persistence of the object: SaveToFile, LoadFromFile, SaveToMemory, and LoadFromMemory.


Name Type Description
Application Engine, read-only Returns the Engine object.
Quality int

Stores the value of the JPEG quality in percent.

The default value for this property is 50.


Name Description
CopyFrom Initializes properties of the current object with values of similar properties of another object.
LoadFromFile Restores the object contents from a file on disk.
LoadFromMemory Restores the object contents from the global memory.
SaveToFile Saves the object contents into a file on disk.
SaveToMemory Saves the object contents into the global memory.

Output parameter

This object is the output parameter of the CreateJpegExtendedParams method of the Engine object.

Input parameter

This object is passed as an input parameter to the following methods:

See also


Working with Images

Working with Properties

3/24/2023 8:51:52 AM

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