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JPEGEncoder

Package | mx.graphics.codec
Class | public class JPEGEncoder
Inheritance | JPEGEncoder Object
Implements | IImageEncoder

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The JPEGEncoder class converts raw bitmap images into encoded images using Joint Photographic Experts Group (JPEG) compression. For information about the JPEG algorithm, see the document http://www.opennet.ru/docs/formats/jpeg.txt by Cristi Cuturicu.

Public Properties

| Property | Defined By
--- | --- | ---
|  | contentType : String [read-only] The MIME type for the JPEG encoded image. | JPEGEncoder

Public Methods

| Method | Defined By
--- | --- | ---
|  | JPEGEncoder(quality:Number = 50.0) Constructor. | JPEGEncoder
|  | encode(bitmapData:BitmapData):ByteArray Converts the pixels of BitmapData object to a JPEG-encoded ByteArray object. | JPEGEncoder
|  | encodeByteArray(byteArray:ByteArray, width:int, height:int, transparent:Boolean = true):ByteArray Converts a ByteArray object containing raw pixels in 32-bit ARGB (Alpha, Red, Green, Blue) format to a new JPEG-encoded ByteArray object. | JPEGEncoder

Property Detail

contentType | property

`contentType:String` [read-only]

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The MIME type for the JPEG encoded image. The value is `"image/jpeg"`.

Implementation
`public function get contentType():String`
Constructor Detail

JPEGEncoder | () | Constructor

`public function JPEGEncoder(quality:Number = 50.0)`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Constructor.

Parameters

| `quality:Number` (default = `50.0`)`` — A value between 0.0 and 100.0. The smaller the `quality` value, the smaller the file size of the resultant image. The value does not affect the encoding speed. Note that even though this value is a number between 0.0 and 100.0, it does not represent a percentage. The default value is 50.0.

Method Detail

encode | () | method

`public function encode(bitmapData:BitmapData):ByteArray`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Converts the pixels of BitmapData object to a JPEG-encoded ByteArray object.

Parameters

| `bitmapData:BitmapData` — The input BitmapData object.

Returns

| `ByteArray` — Returns a ByteArray object containing JPEG-encoded image data.

encodeByteArray | () | method |

`public function encodeByteArray(byteArray:ByteArray, width:int, height:int, transparent:Boolean = true):ByteArray`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Converts a ByteArray object containing raw pixels in 32-bit ARGB (Alpha, Red, Green, Blue) format to a new JPEG-encoded ByteArray object. The original ByteArray is left unchanged. Transparency is not supported; however you still must represent each pixel as four bytes in ARGB format.

Parameters

| `byteArray:ByteArray` — The input ByteArray object containing raw pixels. This ByteArray should contain `4 width height` bytes. Each pixel is represented by 4 bytes, in the order ARGB. The first four bytes represent the top-left pixel of the image. The next four bytes represent the pixel to its right, etc. Each row follows the previous one without any padding.
| `width:int` — The width of the input image, in pixels.
| `height:int` — The height of the input image, in pixels.
| `transparent:Boolean` (default = `true`)`` — If `false`, alpha channel information is ignored.

Returns

| `ByteArray` — Returns a ByteArray object containing JPEG-encoded image data.

Wed Nov 15 2017, 09:50 AM +01:00