Combining foreground png image with jpg background

I've bellow function:

def alphaMerge(small_foreground, background, top, left):
    
    result = background.copy()
    
    fg_b, fg_g, fg_r, fg_a = cv.split(small_foreground)
    print(fg_b, fg_g, fg_r, fg_a)

    fg_a = fg_a / 255.0

    label_rgb = cv.merge([fg_b * fg_a, fg_g * fg_a, fg_r * fg_a])

    height, width = small_foreground.shape[0], small_foreground.shape[1]
    part_of_bg = result[top:top + height, left:left + width, :]

    bg_b, bg_g, bg_r = cv.split(part_of_bg)

    part_of_bg = cv.merge([bg_b * (1 - fg_a), bg_g * (1 - fg_a), bg_r * (1 - fg_a)])

    cv.add(label_rgb, part_of_bg, part_of_bg)
    result[top:top + height, left:left + width, :] = part_of_bg
    return result

if __name__ == '__main__':
   folder_dir = r"C:\photo_datasets\products_small"
   logo = cv.imread(r"C:\Users\PiotrSnella\photo_datasets\discount.png", cv.IMREAD_UNCHANGED)
   for images in os.listdir(folder_dir):
       input_path = os.path.join(folder_dir, images)
       image_size = os.stat(input_path).st_size
       if image_size < 8388608:
           img = cv.imread(input_path, cv.IMREAD_UNCHANGED)
           height, width, channels = img.shape
           if height > 500 and width > 500:
               result = alphaMerge(logo, img, 0, 0)
               cv.imwrite(r'C:\photo_datasets\products_small_output_cv\{}.png'.format(images), result)

I want to combine two pictures, one with the logo which I would like to apply on full dataset from folder products_small. I'm getting a error part_of_bg = cv.merge([bg_b * (1 - fg_a), bg_g * (1 - fg_a), bg_r * (1 - fg_a)]) ValueError: operands could not be broadcast together with shapes (720,540) (766,827)

I tried other combining options and still get the error about problem with shapes, the photo could be a problem or something with the code?

Thank you for your help guys :)

source https://stackoverflow.com/questions/74740521/combining-foreground-png-image-with-jpg-background