Scalr image resize changes background color on output

Question

I am using Scalr to resize images. I have a problem with some images. Scalr is changing the color of the resized image. In short, this is the outline of my code. I read the file from byte array:

BufferedImage image = ImageIO.read(bis);

Then I resize the image using scalr:

Scalr.resize(image,
      Scalr.Method.ULTRA_QUALITY, Scalr.Mode.AUTOMATIC, targetWidth, targetHeight);

Then, I write it to output file:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, extension, baos);

The type of the image before and after resizing is same and equals to TYPE_4BYTE_ABGR.

Original image:

Image after resize:

Answer 1

I had the same issue. To solve this problem you should drop the alpha channel of the image if it exists.

public BufferedImage dropAlphaChannel(BufferedImage src) {
 BufferedImage convertedImg = new BufferedImage(src.getWidth(), src.getHeight(), BufferedImage.TYPE_INT_RGB);
 convertedImg.getGraphics().drawImage(src, 0, 0, null);
 return convertedImg;
}

if (originalImage.getColorModel().hasAlpha()) {
   originalImage = dropAlphaChannel(originalImage);
}

Ref