CHANGING THE IMAGE NAME OR FORMAT
To save an image file under a new name or in a new file format, select the save-as option from the file menu. The save-as dialog box will open.
Specify the location to save the file.
Enter the file name without an extension.
Specify the file format of the image from the drop-down menu. The file does not need to be saved in the original file format. If JPEG is selected, the compression rate must be fixed using the slide bar at the bottom of the dialog box. The higher the compression rate, the smaller the file size, and the lower the image quality.
Click the save button to save the image.