Opening files with ProJPEG‚Ñ¢ takes no special action from the finder. Simply double-click on a JPEG file or drag a JPEG file onto Photoshop, and ProJPEG‚Ñ¢ will be used as the default method for opening all JPEG files and there is no user control over this behavior.
However, ProJPEG‚Ñ¢ does not support all possible variations of JPEG files. For instance it does not support Adobe CMYK JPEG files, since they are not applicable to web use. There will be times when you may need to open a JPEG file with a method other than ProJPEG‚Ñ¢.
 
When in Adobe Photoshop you can specify what method to use opening a given file by opening the file from the ‘Open...’ menu item in the ‘File’ menu. To do this first select the ‘Open..’ item then in the dialog that appears check ‘Show all types’, which is towards the bottom right of the dialog. A pop-up menu titled ‘Format:’ will appear below the file list in the dialog after ‘show all types’ has been checked.
Next select the file you wish to open from the file list by single clicking on it. Note that double clicking on the file will begin the opening process before you have selected the method to open the file with.
Once the correct file is highlighted, select the method you would like the file to be opened with from the ‘Format:’ pop-up menu. Photoshop’s internal JPEG support appears in this menu simply as ‘JPEG’. Once you have selected the method to use in the ‘Format:’ pop-up menu, open the file by hitting the ‘Open’ button.
