import gradio 
import cv2

def greet(image, in_contrast, in_brightness):
    in_contrast = float(in_contrast) / 100*3
    in_brightness = float(in_brightness)
    # contrast [1.0-3.0]
    # brightness [0-100]
    # https://docs.opencv.org/4.x/d3/dc1/tutorial_basic_linear_transform.html
    new_image = cv2.convertScaleAbs(image, alpha=in_contrast, beta=in_brightness)

    cv2.imshow("Display window", new_image);
    int k = waitKey(0); // Wait for a keystroke in the window
    return new_image
    

demo = gradio.Interface(
    fn=greet,
    inputs=['image', gradio.Slider(0,100), gradio.Slider(0, 100)],
    outputs=['image'],
)
demo.launch()