After you have your image set, you need to make sure you can use it again at some point in the future. You can use the Save commands in Photoshop to leave the file in its current format, or save it in a different file format.
And with Save for Web, you can optimize your images for electronic media.
1. To save changes to a file you are currently working on, select File -> Save.
2. To save a file under a different name or location or both, choose File -> Save As. This opens the Save As dialog box. Afterwards type a file name, choose a location for the file, and then hit Save. To save a file in a different file format, select Choose File -> Save As. Then you need to choose a format from the format pop-up menu. Specify a file name and location, choose your saving options, and then click Save.
3. To save an image in a format that’s suitable for delivery on the Web, choose File -> Save for Web to open the Save for Web dialog box.
4. While in the Save for Web dialog box, you can prepare your image in different optimizing formats by clicking one of the four tabs at the top of the image area. The Original tab enables you to view the image without optimization. The Optimized tab applies the current optimization settings that are displayed to the right of the image area. The 2-Up tab enables you to see the original image and the image with the optimization settings applied. The 4- Up tab shows you four views of the image in a two-by-two arrangement. The top left image is the original while the other three have
5. If your image is not entirely visible in the Save for Web dialog box, select the hand tool on the lefthand side of the image area. Then click the image and drag it to bring hidden parts of the image into view. You can also use the Zoom tool (signified by the magnifying glass icon) to magnify or reduce the view. To select the Zoom tool, click in an image window you want to zoom in. Then hold down Alt (Windows) or Option (Mac OS), and click to zoom out. Alternatively, you can specify a magnification level in the Zoom text box at the bottom of the Save for Web dialog box.
6. On the right side of the image area in the Save for Web dialog box is the optimization settings that will be applied to the image. The optimization settings will change depending on which file format you select to view. Changing the settings will be applied to the image if you have selected the Optimization tab. If you have selected the 2- Up or 4-Up tab, the settings will be applied to the image that has a black border around the windowpane.
7. When you have determined the optimization settings you want, click Save to open the Save Optimization As dialog box.
8. In the Save Optimization As dialog box you can rename the file to something other than Photoshop’s suggested name and change the location of where the file is saved and settings for HTML and slices output. The settings for HTML and slices output come in handy if you use a slice tool while working on an image before saving the image for the Web.