How to set color brightness of an image using a SLIDER in MATLAB App R2023a?

This video shows the code to set the color brightness of an image using the slider’s value in a MATLAB App. This app is developed in Matlab App Designer R2023a.

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Complete source code and other details:

Main Method:

    methods (Access = private)

        % Value changing function: Slider
        function SliderValueChanging(app, event)
            changingValue = event.Value;
            if (isempty(app.a))
                app.a = imread(app.Image.ImageSource);
            end
            app.Image.ImageSource = (app.a)*changingValue;
            
        end
    end

Complete source code:

classdef ImageControlApp < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure     matlab.ui.Figure
        Slider       matlab.ui.control.Slider
        SliderLabel  matlab.ui.control.Label
        Image        matlab.ui.control.Image
    end

    
    properties (Access = private)
        a; % Description
    end
    

    % Callbacks that handle component events
    methods (Access = private)

        % Value changing function: Slider
        function SliderValueChanging(app, event)
            changingValue = event.Value;
            if (isempty(app.a))
                app.a = imread(app.Image.ImageSource);
            end
            app.Image.ImageSource = (app.a)*changingValue;
            
        end
    end

    % Component initialization
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Get the file path for locating images
            pathToMLAPP = fileparts(mfilename('fullpath'));

            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'MATLAB App';

            % Create Image
            app.Image = uiimage(app.UIFigure);
            app.Image.Position = [107 178 427 289];
            app.Image.ImageSource = fullfile(pathToMLAPP, 'butterfly.jpg');

            % Create SliderLabel
            app.SliderLabel = uilabel(app.UIFigure);
            app.SliderLabel.HorizontalAlignment = 'right';
            app.SliderLabel.Position = [33 88 36 22];
            app.SliderLabel.Text = 'Slider';

            % Create Slider
            app.Slider = uislider(app.UIFigure);
            app.Slider.Limits = [0 2];
            app.Slider.ValueChangingFcn = createCallbackFcn(app, @SliderValueChanging, true);
            app.Slider.Position = [90 97 518 3];
            app.Slider.Value = 1;

            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end

    % App creation and deletion
    methods (Access = public)

        % Construct app
        function app = ImageControlApp

            % Create UIFigure and components
            createComponents(app)

            % Register the app with App Designer
            registerApp(app, app.UIFigure)

            if nargout == 0
                clear app
            end
        end

        % Code that executes before app deletion
        function delete(app)

            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

Screenshots: