In this page, you will see a series of pictures that have been modified with Adobe Creative Cloud Photoshop. There are three different pictures with three different sizes each one with a different purpose.
This is the original image.
This is the modified version of the original picture. The image size has been resized to be posted on a web page.
The resolution has been reduced to 72.
This is the modified version of the original picture. The image size has been resized to be posted on an edoc page.
This, on the other hand, is how the picture would look if you add a filter in it.