Downscaling Images

To downscale images:

1. Construct a new ImageScaler object with source and destination path of the image.

   //Construct a new ImageScaler object to downscale a JPEG image on the device
   ImageScaler is = new ImageScaler("file:///Phone/big.jpg", "file:///Phone/small.jpg");
   

2. Use the ImageScaler.setJpegQuality method for specifiying output quality of the JPEG image.

   //Set image quality for the JPEG image
   is.setJpegQuality(70);
   

3. Use the ImageScaler.scaleImage method for downscaling image. You can construct the ImageScaler.scaleImage method in one of two ways

   • ImageScaler.scaleImage(int maxFileSize)

     Use this constructor to specify the maximum output file size, in kilobytes, for the downscaled image.

     //Set the downscaled image’s file size to be less than or equal to 100kb
     is.scaleImage(100);
     

   • ImageScaler.scaleImage(int width, int height, boolean keepAspectRatio)

     Use this constructor to specify the desired width and height in pixels for the downscaled image. You must also specify if the aspect ratio of the source image needs to be retained.

     //Set the downscaled image’s dimensions to 320x480px, and ignore the source image’s aspect ratio
     is.scaleImage(320, 480, false);