Image compression: How to set RAW + JPEG
With the EOS 350D and 400D you can only select RAW+Large JPEG as a simultaneous shooting option. All the other EOS cameras allow you to shoot any of the JPEG sizes with the RAW file.
The EOS 10D RAW+JPEG option is set with Custom Function 08. The JPEG image is embedded within the RAW file and must be extracted with File Viewer Utility software (supplied with the camera). Other models allow you to set the RAW+JPEG option through the ‘Quality’ setting menu screen and save the files separately to your CF or SD media card.
1. Press the menu button to show the menu options
2. Navigate to the ‘Quality’ setting menu screen
3. Select one of the RAW+JPEG options on display
Buffer issues
When you’re shooting both RAW and JPEG together, the camera has a larger amount of data to process so there will be more megabytes to save to the memory card. This will have a direct affect on the number of images you can shoot in a single burst before the buffer locks out.
Backing up your files
The EOS-1D Mark II N, 1D Mark III and 1Ds Mark III have a little trick in their armoury that adds to the advantages of shooting RAW and JPEG simultaneously. These cameras have two media card slots, one for a CompactFlash (CF) card and one for a SecureDigital (SD) card. However, unlike the EOS-1D Mark II, which also has two card slots, the newer cameras are able to treat each card separately so you can save your RAW files to one card and your JPEG files to another. This is a big advantage as it allows the files to be kept separate. You can download the JPEG files quickly to a computer if you need to e-mail or print them immediately, leaving the RAW files for later.
The addition of a third file type on the EOS-1D Mark III and 1Ds Mark III – sRAW – means there are four options. You can choose to shoot sRAW+RAW, RAW+JPEG, sRAW+JPEG or JPEG+JPEG. Why would you want to save JPEG+JPEG? Either because you are saving these at different resolutions (for e-mail and printing), or because you want a backup in case one of the media cards is corrupted.
Cameras with RAW+JPEG
| EOS-1D |
| EOS-1D Mark II |
| EOS-1D Mark II N |
| EOS-1D Mark III |
| EOS-1Ds |
| EOS-1Ds Mark II |
| EOS-1Ds Mark III |
| EOS 5D |
| EOS 10D** |
| EOS 20D |
| EOS 20Da |
| EOS 30D |
| EOS 40D |
| EOS 350D* |
| EOS 400D* |
*RAW+Large JPEG only