Is there a method to convert PNG and GIF images to JPEG with openCV, while converting the alpha channel to white color?
Is there a method to convert PNG and GIF images to JPEG with openCV, while converting the alpha channel to white color?
When dealing with RGBA images, the alpha channel plays a crucial role in determining how the background will impact the overall image. An equation that captures this concept is as follows:
out = (bg * (1 - alpha)) + (image * alpha)
In this equation, the 'out' represents the final image, while the 'image' consists of the R, G, and B channels of our RGBA image, and the 'bg' refers to the background image. It should be noted that the alpha value falls within the range of 0 to 1.
If you prefer a white plane image as your background, the computation becomes much simpler. You can opt for the following approach:
B, G, R, A = cv2.split(image)
alpha = A / 255
R = (255 * (1 - alpha) + R * alpha).astype(np.uint8)
G = (255 * (1 - alpha) + G * alpha).astype(np.uint8)
B = (255 * (1 - alpha) + B * alpha).astype(np.uint8)
image = cv2.merge((B, G, R))
For those who find the split and merge process cumbersome, an alternative implementation exists:
bg = np.array([255, 255, 255])
alpha = (image[:, :, 3] / 255).reshape(image.shape[:2] + (1,))
image = ((bg * (1 - alpha)) + (image[:, :, :3] * alpha)).astype(np.uint8)
The first line focuses on creating a background image, followed by computing the alpha value between 0 and 1 in the second line. Lastly, the third line demonstrates the utilization of the alpha formula.
To utilize Open CV, simply open the image in RGB format by specifying 1 as the second parameter in cv2.imread instead of -1. Using -1 will open the image in its original format, preserving any transparency it may have. By setting the parameter to 1, you can ensure the image is opened in RGB format. Following this, use cv2.imwrite to save the RGB image without transparency, saving it with a .jpg file extension.
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