Lab 13: Bright Ideas

Due by the end of class

The goal of this lab is to make a tool that can do a simple adjustment of the brightness of an image, making it either darker or lighter.

Specification

Create a project called Lab13. Add a Brightness class (with a main() method) as well as a Picture class. Delete everything inside the Picture class and paste in the code from Picture.java.

Input

Inside of the main() method in the Brightness class, prompt the user to enter the name of the image file to work with. Read in this String and create a new Picture object using the file name in the constructor.

Then, prompt the user for a brightness level between 0 and 5 and read in this value as a double.

Brightness

Create two nested for-loops that iterate through every pixel in the image (just like a 2D array, except that you have to use the get() method with an x and a y parameter to get a pixel at a particular location).

Get the Color value for each pixel. Then, extract the red, green, and blue values from the Color object using the getRed(), getGreen(), and getBlue() methods.

Multiply the red, green, and blue values by the brightness value entered by the user. If any of them are larger than 255, set them to 255. For example, if the user entered a brightness value of 1.6, the image will get brighter (values less than 1 will make it darker). So, a pixel with R, G, and B values of (35, 200, 18) would become (56, 255, 28).

Finally, once the new red, green, and blue values have been computed, set the current pixel to a new Color made from the updated red, green, and blue values, rounded to the nearest integer using Math.round(). You can create the Color using a constructor. Then, you can set the pixel value to that Color using the set() method.

Output

After updating all the pixels in the for loops, call the show() method once to show the image with adjusted brightness.

Here is an example of the user editing the image workstation.jpg and changing it to a brightness of 2.6. Please try to match the output formatting exactly.

What picture would you like to edit? workstation.jpg
How bright do you want your image? (0-5) 2.6

Below is the image before editing:

Below is the image after editing:

You can download the original image by right-clicking here and saving the target or the link. Alternatively, you should be able to download any image ending in .jpg or .png from the Internet and use that for testing.

Turn In

Turn in your code by uploading Brightness.java from the Lab13\src folder wherever you created your project to Blackboard. Do not upload the entire project. The Picture.java file is unnecessary. I only want the Brightness.java file.

All work must be done individually. Never look at someone else's code. Please refer to the course policies if you have any questions about academic integrity. If you have trouble with the assignment, I am always available for assistance.