Instead, go to [File > Save For Web]. Notice the “Save for web” text.. 
Select the JPG option and move the slider across until you see a loss in quality. For me it I stopped the slider at around 46. Then obviously click “Save”.
source: http://www.zymic.com/tutorials/photoshop/reduce-image-size/
Tags: how to resize image with photoshop, image resize, photoshop in resizing image, photoshop tips, reduce image size in photoshop, resize image with photoshop
