JPEG/RAW Image Size & Quality
The S45 provides four image size options in combination with three JPEG quality settings. On top of this you have the a RAW format (losslessly compressed) which contains the RAW data as it comes off the CCD sensor (unprocesed).
 Standard Test Scene |
To give an impression of what some of the combinations of image size and quality produce the table below is a cross reference of some of them:
- 2272 x 1704 RAW
- 2272 x 1704 Super-Fine
- 2272 x 1704 Fine
- 2272 x 1704 Normal
- 1600 x 1200 Super-Fine
- 1024 x 768 Super-Fine
- 640 x 480 Super-Fine
Images below are cropped 240 x 100 area of the image magnified
200% (nearest neighbour).
| 2272 x 1704 | |
| RAW |  4,250 KB Canon RAW (.CRW) - not available for download |
| Super Fine JPEG |
 1,903 KB |
| Fine JPEG |
 1,188 KB |
| Normal JPEG |
 560 KB |
| 1600 x 1200 | |
| Super Fine JPEG |
 1,037 KB |
| 1024 x 768 | |
|
Super |
 455 KB |
| 640 x 480 | |
|
Super |
 209 KB |
As has been our previous experience Canon's choice of providing a 'Super-Fine' JPEG option delivers near-TIFF-like image quality with virtually no JPEG artifacts and no loss of detail. Higher compression levels (Fine, Normal) do begin to introduce some slight JPEG artifacts but nothing you would see at 100% zoom. Obviously the ability to shoot RAW (and now to selectively switch to RAW format during record review) is a big plus for the S45 and gives you far more post-processing flexibility.
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