How Can I Achieve Flexible Image Scaling with Interpolation in Java?

Scaling a BufferedImage with Flexible Interpolation

In an attempt to resize a BufferedImage using the Java API, an implementation struggled to produce the desired result. The code utilized the Graphics2D class to apply a scaling transformation to the image but encountered failure.

Upon analyzing the issue, it became apparent that the provided solution lacked the capability to specify the interpolation type. AffineTransformOp offers this crucial flexibility, enabling the selection of resampling techniques such as interpolation.

Consider the following revised code:

BufferedImage before = getBufferedImage(encoded);
int w = before.getWidth();
int h = before.getHeight();
BufferedImage after = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
AffineTransform at = new AffineTransform();
at.scale(2.0, 2.0);
AffineTransformOp scaleOp =
   new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
after = scaleOp.filter(before, after);

This code snippet demonstrates the use of AffineTransformOp to resample the image using bilinear interpolation, producing a smoother and more accurate result.

It's worth noting that the provided code scales the image uniformly in both horizontal and vertical dimensions. For asymmetric scaling, an independent scaling factor would need to be specified for each axis within the AffineTransform object.

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