Hi Arijit. To augment a single image and view the output, you can use the code snippet as shown below. You can change the "Training_image" and "Input_Layer_Size" variables to suit your use case
Training_image = imread("image.jpg");
Input_Layer_Size = [200, 200, 3];
Resized_Training_image = augmentedImageDatastore(Input_Layer_Size, Training_image, 'ColorPreprocessing','gray2rgb');
resized_image = read(Resized_Training_image);
imshow(cell2mat(resized_image{1,1}));