in matlab please!

4 (15pts) RGB Binary In this part, we want to be able to convert your color image into a binary image, where each pixel is either black or white. To do this, first convert your image to grayscale (using what you did in the previous part), then produce three binary images, one for each of the following thresholds (as percentages of maximum possible intensity value): - t=25% - t=50% - t=75%