The content provides a MATLAB App Designer R2023a developed application for image brightness control. The application modifies the brightness of an image using the dynamic slider value. The presented source code shows an ‘ImageControlApp’ class with properties that match with app components and callback methods which handle component events. The key function, ‘SliderValueChanging’, adjusts the image source according to the changing value of the slider for brightness control. The program further constructs and deletes the application along with the user interface figure, as needed. The application source code and video tutorial is available for better understanding.