Resize image while keeping aspect ratio in Java

Question

im trying to resize bufferdImage in memory in java but to keep the aspect ratio of the image im have something like this but this is not good

int w = pictu         


        

Answer 1

If width, height of source and target are known, use following function to determine scale of the image.

private double determineImageScale(int sourceWidth, int sourceHeight, int targetWidth, int targetHeight) {

double scalex = (double) targetWidth / sourceWidth;
double scaley = (double) targetHeight / sourceHeight;
return Math.min(scalex, scaley);

}

Then use this scale to scale up/down the image using following code

Image scaledImage = sourceBufferedImage.getScaledInstance((int) (width * scale), (int) (height * scale), Image.SCALE_SMOOTH);