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# 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](/fine-reader/engine/api-reference/image-related-objects/image/writetofile-method) 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. Later, the object can be re-created by reading the object's state from the persistent storage. The following methods provide persistence of the object:

Linux: [SaveToFile](/fine-reader/engine/api-reference/supplementary-objects-and-methods/savetofile-method), and [LoadFromFile](/fine-reader/engine/api-reference/supplementary-objects-and-methods/loadfromfile-method)

Windows [SaveToFile](/fine-reader/engine/api-reference/supplementary-objects-and-methods/savetofile-method), [LoadFromFile](/fine-reader/engine/api-reference/supplementary-objects-and-methods/loadfromfile-method), [SaveToMemory](/fine-reader/engine/api-reference/supplementary-objects-and-methods/savetomemory-method), and [LoadFromMemory](/fine-reader/engine/api-reference/supplementary-objects-and-methods/loadfrommemory-method).

## Properties

| Name        | Type                                                                                                                                                                                                          | Description                                                                                 |
| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------- |
| Application | [Engine](/fine-reader/engine/api-reference/engine-object-iengine-interface), [read-only](/fine-reader/engine/guided-tour/advanced-techniques/programming-aspects/working-with-properties#readonly_properties) | Returns the Engine object.                                                                  |
| Quality     | [int](/fine-reader/engine/guided-tour/advanced-techniques/programming-aspects/working-with-properties)                                                                                                        | Stores the value of the JPEG quality in percent. The default value for this property is 50. |

## Methods

| Name                                                                                                                  | Description                                                                                       |
| --------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------- |
| [CopyFrom](/fine-reader/engine/visual-components-reference/supplementary-objects/spellwordcollection/copyfrom-method) | Initializes properties of the current object with values of similar properties of another object. |
| [LoadFromFile](/fine-reader/engine/api-reference/supplementary-objects-and-methods/loadfromfile-method)               | Restores the object contents from a file on disk.                                                 |
| [LoadFromMemory](/fine-reader/engine/api-reference/supplementary-objects-and-methods/loadfrommemory-method)           | Restores the object contents from the global memory. <Note> *Windows only.*</Note>                |
| [SaveToFile](/fine-reader/engine/api-reference/supplementary-objects-and-methods/savetofile-method)                   | Saves the object contents into a file on disk.                                                    |
| [SaveToMemory](/fine-reader/engine/api-reference/supplementary-objects-and-methods/savetomemory-method)               | Saves the object contents into the global memory. <Note> *Windows only.*</Note>                   |

## Output parameter

This object is the output parameter of the [CreateJpegExtendedParams](/fine-reader/engine/api-reference/engine-object-iengine-interface/creation-methods/createlessobjectgreater-methods) method of the [Engine](/fine-reader/engine/api-reference/engine-object-iengine-interface) object.

## Input parameter

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

* [WriteToFile](/fine-reader/engine/api-reference/image-related-objects/image/writetofile-method) method of the [Image](/fine-reader/engine/api-reference/image-related-objects/image) object
* [CreateMultipageImageWriter](/fine-reader/engine/api-reference/engine-object-iengine-interface/creation-methods/createmultipageimagewriter-method) method of the [Engine](/fine-reader/engine/api-reference/engine-object-iengine-interface) object

## See also

[ImageFileFormatEnum](/fine-reader/engine/api-reference/enumerations/imagefileformatenum)

[Working with Images](/fine-reader/engine/guided-tour/advanced-techniques/working-with-images)

[Working with Properties](/fine-reader/engine/guided-tour/advanced-techniques/programming-aspects/working-with-properties)