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JPEG Image Size & Quality


Standard Test Scene

The PowerShot SD100 allows you to select image size and JPEG quality separately. For image size you have the following options; 2048 x 1536 (L), 1600 x 1200 (M1), 1024 x 768 (M2) and 640 x 480 (S). For JPEG quality there are Super-Fine, Fine and Normal settings. Note that the SD100 does not provide a RAW or TIFF output.

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:

  • 2048 x 1536 Super-Fine JPEG
  • 2048 x 1536 Fine JPEG
  • 2048 x 1536 Normal JPEG
  • 1600 x 1200 Super-Fine JPEG
  • 1024 x 768 Super-Fine JPEG

Images below are cropped 240 x 100 area of the image magnified 200% (nearest neighbour).


 
2048 x 1536
JPEG
Super
Fine

1,492 KB
JPEG
Fine

913 KB
JPEG
Normal

423 KB
 

 
1600 x 1200
JPEG
Super
Fine

940 KB
 

 
1024 x 768
JPEG
Super
Fine

456 KB

As we expect Canon's Super-Fine JPEG option provides virtually artifact free images. File sizes at this quality setting are larger than the average but that reflects the retained detail in the image. Considering the availability of higher capacity SD cards I personally would shoot at the Fine JPEG setting, at 100% magnification there is visibly no difference between it and Super-Fine and yet you will make a 600 KB per image saving on storage. As noted in my PowerShot S400 review Canon use a high quality interpolation algorithm (probably bilinear) for their lower resolution images which means detailed clean images with no hard edges or alias effects.

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