Quality Image Resizing with JAI

ThumbMaster Reference: resizeImage

Resizes an image by the specified scale factor, which is applied to both the X and Y dimensions.

Declaration

static RenderedImage resizeImage(source, scaleFactor)

Parameters

source: A RenderedImage object containing the source image that is to be resized.
scaleFactor: The scaling factor to use when resizing the image. For example, to create an image that is half as tall and half as wide, a scaling factor of 0.5 would be used.

Details

The following table contains example image dimensions, and what size image will be created by a call to this method.

Original Size	Requested Width	New Size
800×800	0.75	600×600
800×800	0.5	400×400
800×800	0.25	200×200

Example Usage

The following example shows how to load an image file, resize it to one-tenth of its original dimensions, and then save it as a new image:

import net.devella.thumbs.ThumbMaster;

...
// read source image from a file
RenderedImage source =
    ImageIO.read(new File("/tmp/source.png"));

// resize the image
RenderedImage result =
    ThumbMaster.resizeImage(source, 0.1F);

// write the image to a new file
ImageIO.write(result, "png", new File("/tmp/result.png"));
...