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Q-Confused about which picture record mode to use in a digital camera.



 
 
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  #1  
Old July 11th 04, 02:02 PM
Mr. Rather B. Beachen
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Default Q-Confused about which picture record mode to use in a digital camera.

Hi:

I have an Olympus C-50. In the past, with my D-40, I had always chosen
the SHQ (low compression) mode. But I've often wondered if I should be
shooting under TIFF (uncompressed) mode to obtain the highest quality
shoot for future printing and retouching. I've never considered
shooting under any of the other modes offered (HQ, SQ1, SQ2).

So my questions a

1) Is there really any noticeable difference between TIFF and SHQ
mode?
2) Any reason to be shooting under one mode vs the other?

Thanks


It's Mr. Rather B. Beachen to you


  #2  
Old July 13th 04, 01:50 AM
Bob
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Default Q-Confused about which picture record mode to use in a digital camera.

On Sun, 11 Jul 2004 06:02:51 -0700, Mr. Rather B. Beachen
wrote:

Hi:

I have an Olympus C-50. In the past, with my D-40, I had always chosen
the SHQ (low compression) mode. But I've often wondered if I should be
shooting under TIFF (uncompressed) mode to obtain the highest quality
shoot for future printing and retouching. I've never considered
shooting under any of the other modes offered (HQ, SQ1, SQ2).

So my questions a

1) Is there really any noticeable difference between TIFF and SHQ
mode?


You should make some tests to see for yourself. What I did on my last camera was
to take pictures at each quality setting and compare them at high magnification
on the computer. What I was looking for was what I call 'jaypegging' which is my
term for the distortion caused by the JPEG conversion process.

This distortion shows up as little squares of color inside bigger squares, as
opposed to the original TIFF image that has only pixels. I compare each JPEG
image to the TIFF which is the best quality

So you select the same area in each image, and blow them up so that you can see
individual color squares in the TIFF image. Now look at the JPEG image and see
how close they are in appearance. As you decrease the JPEG quality, the color
squares will be blended into bigger squares, eventually destroying all of the
detail if you go to far. Luckily no camera settings go too far!

I found on my last camera that the fine jpg was very very close to the TIF
image, and in only a few places could I find blended pixels. The regular jpg did
have lots of blended areas, but they weren't a problem at lower magnification,
so a lot depends on what you do with the final picture.

I decided to not use the TIF because it gave no advantage, and wasted lots of
space!

One other thing - I found that even though the file size for a 'medium size +
fine jpeg' was the same as a 'full size + norm jpeg' , as far as quality of
picture went, the large size beat the small by a wide margin. When you increase
the small pic to compensate, you merely double the pixels, so the larger picture
is better to begin with, and less quality jaypegging may not mess it up as much.

I still have to make some comparisons on my new camera, but in it's case I also
have dynamic range to worry about, since jpegs are 24 bit and the camera is 32.

I think...

 




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