If you want to compress an image in Photoshop, there are a few different ways to do it. One way is to use the Image Size dialog box. To do this, first open the Image Size dialog box by selecting Image > Image Size. Next, enter the dimensions of the image you want to compress into the Width and Height fields and click on the Compress button. Another way to compress an image is to use the JPEG compression tool in Photoshop. To use this tool, first select the image you want to compress and then click on the JPEG button in the toolbar. Next, select a compression level from 1-9 and click on OK. ..