JPEG – TIFF file size question

TC
Posted By
Todd Cary
Dec 30, 2005
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377
Replies
3
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Closed
With my Nikon D-100, I have the following file sizes:

TIFF: 18 MB
JPEG (High): 3 MB

Since the camera has 6.1 MP sensor, 3 bytes (RGB) X 6 MP = 18 MB, makes sense. My question has to do with the amount of compression.

It appears that the High Quality in the D-100 is producing a file ~25% of the maximum.

A friend of mine purchased a pocket camera with a 7 MP sensor and her JPEG file size when set to High Quality is ~18 MB. It appears that the JPEG specification provides for a near zero compression. Is this a correct assumption?

Todd
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N
nomail
Dec 30, 2005
Todd Cary wrote:

With my Nikon D-100, I have the following file sizes:

TIFF: 18 MB
JPEG (High): 3 MB

Since the camera has 6.1 MP sensor, 3 bytes (RGB) X 6 MP = 18 MB, makes sense. My question has to do with the amount of compression.
It appears that the High Quality in the D-100 is producing a file ~25% of the maximum.

A friend of mine purchased a pocket camera with a 7 MP sensor and her JPEG file size when set to High Quality is ~18 MB. It appears that the JPEG specification provides for a near zero compression. Is this a correct assumption?

It would be, but I don’t think there is any pocket camera producing file sizes of 18 MB. Did you check that yourself, or could it perhaps be a misunderstanding and should be 1.8 MB?

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl/
D
DBLEXPOSURE
Dec 30, 2005
"Todd Cary" wrote in message
With my Nikon D-100, I have the following file sizes:

TIFF: 18 MB
JPEG (High): 3 MB

Since the camera has 6.1 MP sensor, 3 bytes (RGB) X 6 MP = 18 MB, makes sense. My question has to do with the amount of compression.
It appears that the High Quality in the D-100 is producing a file ~25% of the maximum.

A friend of mine purchased a pocket camera with a 7 MP sensor and her JPEG file size when set to High Quality is ~18 MB. It appears that the JPEG specification provides for a near zero compression. Is this a correct assumption?

Todd

I don’t have the absolute answer for you, just some things to add.

First, "High Quality" May be setting the image size,(pixel dimensions),
i.e. 800X600 1024X768 etc..

Secondly, compression or, the amount of, or change in file size, is image dependant. If you shoot a white wall with no detail in it, this image can be compressed to a very small file. If you shoot and image with a huge amount of detail, (very few repeated pixels), it will not be compressed as much as the former.

So, to start off, make sure you are comparing apples to apples and oranges to oranges. Shoot images with both cameras that a relativley simular and then compare file sizes et…
TC
Todd Cary
Dec 30, 2005
Johan W. Elzenga wrote:
Todd Cary wrote:

With my Nikon D-100, I have the following file sizes:

TIFF: 18 MB
JPEG (High): 3 MB

Since the camera has 6.1 MP sensor, 3 bytes (RGB) X 6 MP = 18 MB, makes sense. My question has to do with the amount of compression.
It appears that the High Quality in the D-100 is producing a file ~25% of the maximum.

A friend of mine purchased a pocket camera with a 7 MP sensor and her JPEG file size when set to High Quality is ~18 MB. It appears that the JPEG specification provides for a near zero compression. Is this a correct assumption?

It would be, but I don’t think there is any pocket camera producing file sizes of 18 MB. Did you check that yourself, or could it perhaps be a misunderstanding and should be 1.8 MB?
You are correct! I downloaded the manual for my friend’s camera and for the highest setting the file size is ~4.3 MB…more realistic. Most likely the picture they were looking at was 1.8 MB as you suggested.

Since I seldom change my settings for image size (in fact, never), I had completely forgotten about that parameter. It is always on the maximum with the only change being between RAW and JPEG.

Thank you for taking the time to answer what became a dumb question.

Todd

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