What is the equivalent photoshop setting for normal, fine and superfine on my canon digital?

when you save a jpeg photo in photoshop, it gives you an option of saving it in 1-12 quality. I was just wondering if you know what level quality canon cameras use for normal, fine and superfine.What is the equivalent photoshop setting for normal, fine and superfine on my canon digital?
I would guess that superfine is a normal jpeg compression of 1:4. Fine is 1:8 and normal is 1:16. This is pretty standard.





Now the trick would be to figure out what Photoshop uses. Of course, you already know that 12 is the best and 1 is the worst.





Here's my stock answer on compression, if you do not already know this stuff.





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JPG Compression





If you took a picture in RAW or TIFF mode, the camera is actually utilizing the maximum capacity of your sensor and it is storing one piece of the image for each and every pixel that registers light.





When you take a digital photo in jpg mode - which is the standard - the camera actually takes a SAMPLE of all the possible parts of the image available. In order to save you some memory space, the jpeg image is compressed. The least compression gives the highest resolution. The standard ';best'; resolution on a digital camera is 1:4. In other words, the image processor looks at any FOUR pixels in the immediate area and decides which one is the most representative of that group and that's the one it saves. With 6 or 10 MILLION pixels to choose from, there are still millions of pixels left in the final image, so 1:4 is still considered ';fine'; resolution.





The next step down in resolution is usually 1:8 where one out of eight pixels are actually saved and the next down is usually 1:16 where only one out of 16 pixels are actually saved.





Have you seen HDTV yet? The typical HDTV can display up to 1080 lines per screen, no matter what size the screen is. (Some source material is ';only'; 720 lines per screen.) Standard TV can only display 480 lines from top to bottom of the screen. This means that HDTV is giving you more than two times the density of pixels (2.25, actually) so there is room for more visual information in the picture, which translates into more detail. This is similar to a comparison between the various jpg compressions. Less compression produces the greatest resolution.What is the equivalent photoshop setting for normal, fine and superfine on my canon digital?
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There is no direct correlation.





The normal, fine and super fine is how the camera processes the image to remove some of the resolution inherent within the sensor. Shooting at lower resolutions produce smaller files with less data.





In Photoshop when your save as a new JPEG file, you are further reducing the quality of the image you are saving. Once an image has been resized to say 600 x 400 @ 72 DPI and the file size is still to large, you can reduce the file size (and quality) by lowering the quality number from say 12 to 9 ... or lower.





It is always a good idea to shoot your camera using its highest resolution ... after all you spent the money on a high quality camera with many megapixels on its sensor ... why would you want to shoot the camera as if it was a low megapixel setting?
Just a guess but I would say that normal would be 6 fine would be 9 or 10 and superfine would be 11 or 12!!