final ImagingModuleConfig config = (ImagingModuleConfig) ModuleRegistry.Factory.getInstance().getModuleInstance("imaging");
final ImageGenerator generator = config.getGenerators().get("myOperationChainBResize");

Session dmsSession = MgnlContext.getJCRSession("dms");
Node origImage = dmsSession.getNode("/test/orig");

final Content content = info.magnolia.cms.util.ContentUtil.asContent(origImage);

final ParameterProvider<Content> parameterProvider = new ContentParameterProvider(new SimpleEqualityContentWrapper(content));
final BufferedImage bufferedImage = generator.generate(parameterProvider);

ImageIO.write(bufferedImage, "png", new File("/Users/cringele/Documents/temp_stuff/image-test/create/out1-works.png"));
ImageIO.write(bufferedImage, "jpg", new File("/Users/cringele/Documents/temp_stuff/image-test/create/out1-worksNot.jpg"));

if (source != null) {
    throw new ImagingException("This operation currently does not support overlaying images");
}
final BufferedImage loaded = loadSource(filterParams);
if (loaded == null) {
    throw new ImagingException("Could not load image for " + filterParams);
}

//This line is the source of the problem. Using BufferedImage.TYPE_INT_RGB would work because it wouldn't contain any alpha channel. Of course just for testing applicable.
final BufferedImage img = new BufferedImage(loaded.getWidth(), loaded.getHeight(), BufferedImage.TYPE_INT_ARGB_PRE);
final Graphics2D g = img.createGraphics();

if (backgroundColor != null) {
    g.setColor(backgroundColor);
    g.fill(new Rectangle(0, 0, img.getWidth(), img.getHeight()));
}
g.drawImage(loaded, null, 0, 0);
// TODO would this make any difference ? g.drawRenderedImage(loaded, null);

g.dispose();
return img;

if (source != null) {
    throw new ImagingException("This operation currently does not support overlaying images");
}
final BufferedImage loaded = loadSource(filterParams);
if (loaded == null) {
    throw new ImagingException("Could not load image for " + filterParams);
}
return loaded;

if (source != null) {
    throw new ImagingException("This operation currently does not support overlaying images");
}
final BufferedImage loaded = loadSource(filterParams);
if (loaded == null) {
    throw new ImagingException("Could not load image for " + filterParams);
}
final BufferedImage img = new BufferedImage(loaded.getWidth(), loaded.getHeight(), BufferedImage.TYPE_INT_ARGB_PRE);
final Graphics2D g = img.createGraphics();

if (backgroundColor != null) {
    g.setColor(backgroundColor);
    g.fill(new Rectangle(0, 0, img.getWidth(), img.getHeight()));
}
//Image not loaded on top of it
//g.drawImage(loaded, null, 0, 0);
// TODO would this make any difference ? g.drawRenderedImage(loaded, null);

g.dispose();
return img;