Save for Web is a feature of later editions of Adobe Photoshop that lets us balance size and quality to get the best result and image. Save for Web won’t change your original image, and by using the 2-Up and 4-Up options, you can compare your changes to your original immediately. Options such as quality will let you change the amount of pixels sampled, and it’s set to bicubic by default. Tick in sRGB will show you how your colors will look on the net, and likewise under preview you’ll see your picture as it might look with other monitor settings, letting you make adjustments accordingly. Quality goes from maximum, with no visible distortion, to low, which generally creates a lot of messy areas called artifacts.
Once happy with your picture, you can see a preview in the web browser and then save with the option to rename your file into something more web friendly. I’m Marie Gardiner, that was Adobe Photoshop JPEG compression in 60 seconds..