1# Image Encoding 2 3Image encoding refers to the process of encoding a pixel map into an archived image in different formats (only in JPEG, WebP, and PNG currently) for subsequent processing, such as storage and transmission. 4 5## How to Develop 6 7Read [Image API Reference](../reference/apis/js-apis-image.md#imagepacker) for APIs related to image encoding. 8 91. Create an **ImagePacker** object. 10 11 ```ts 12 // Import the required module. 13 import image from '@ohos.multimedia.image'; 14 15 const imagePackerApi = image.createImagePacker(); 16 ``` 17 182. Set the encoding output stream and encoding parameters. 19 20 **format** indicates the image encoding format, and **quality** indicates the image quality. The value ranges from 0 to 100, and the value 100 indicates the optimal quality. 21 22 ```ts 23 let packOpts : image.PackingOption = { format:"image/jpeg", quality:98 }; 24 ``` 25 263. [Create a PixelMap object or an ImageSource object](image-decoding.md). 27 284. Encode the image and save the encoded image. 29 30 Method 1: Use the **PixelMap** object for encoding. 31 32 ```ts 33 import {BusinessError} from '@ohos.base' 34 imagePackerApi.packing(pixelMap, packOpts).then( (data : ArrayBuffer) => { 35 // data is the file stream obtained after packing. You can write the file and save it to obtain an image. 36 }).catch((error : BusinessError) => { 37 console.error('Failed to pack the image. And the error is: ' + error); 38 }) 39 ``` 40 41 Method 2: Use the **ImageSource** object for encoding. 42 43 ```ts 44 import {BusinessError} from '@ohos.base' 45 imagePackerApi.packing(imageSource, packOpts).then( (data : ArrayBuffer) => { 46 // data is the file stream obtained after packing. You can write the file and save it to obtain an image. 47 }).catch((error : BusinessError) => { 48 console.error('Failed to pack the image. And the error is: ' + error); 49 }) 50 ``` 51