Flattens images with alpha channels by compositing them against a white background. Transparent areas are composited with white background and output as RGB images without transparency.
Converts alpha channel (transparency) to grayscale values. Functions as the inverse transformation of BrightnessTransparency, restoring brightness information that was expressed as transparency back to grayscale images.
Automatically binarizes images using Otsu's binarization algorithm. Automatically calculates the optimal threshold and separates light and dark areas in the image.
Removes noise mixed in white backgrounds. Performs binarization with the specified threshold and replaces white background areas with pure white to remove noise.