Re: JPEG fading and Sensor size

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"Charles" <ckraft@xxxxxxxxxxxxxxxxx> wrote in message
news:ns7a12t92nrg8ba46p9pnrr5q1lol8idju@xxxxxxxxxx
| On 12 Mar 2006 22:33:17 -0800, "cjcampbell"
| <christophercampbell@xxxxxxxxxxx> wrote:
|
| >Most people are surprised to discover that JPG photos have such a short
| >shelf life. You can slow the process down somewhat by re-copying them
| >every three months, but eventually they will fade to almost nothing
| >anyway.
| >
| >This deterioration is caused by UV rays and magnetic fields emanating
| >from your computer monitor and other peripherals -- even your disk
| >drive -- and cosmic rays coming from the sun.
| >
| >Think of the constant bombardment of your storage media as a kind of
| >rain. Obviously, larger media such as DVDs and 5.25 inch floppy disks
| >will be struck by cosmic rays, UV, and other particles much more
| >frequently than smaller forms of media. Each particle can irrecoverably
| >destroy some of your data. Back in the old days when disk drives were
| >12 inch platters (or even larger), data often did not last more than a
| >few weeks! You should therefore store your most important photos on
| >storage devices that are as small as possible, and use only one device
| >at a time, since putting your data on two different drives more than
| >doubles the risk that your data will be damaged.
| >
| >Compressing the JPEG file as much as possible will also reduce the
| >damage done by cosmic rays and UV light.
| >
| >Another problem with large storage devices also applies to camera
| >sensors. A larger storage device or camera sensor must have the data
| >"stretched" over a larger area, creating holes in your pictures. This
| >is why photos taken with the Canon 5D appear thin and faded compared to
| >pictures taken with a cell phone. The cell phone has a smaller sensor
| >and is able to concentrate the picture better. The most advanced
| >cameras all have smaller sensors for this reason, while primitive DSLRS
| >must continue to have large sensors in order remain backwards
| >compatible with lenses and other accessories. Some camera manufacturers
| >have attempted to load the larger sensors up with more pixels in an
| >attempt to fill the quantum holes created by stretching the picture too
| >
| >thinly, but it is obvious that the quantum limits on number of pixels
| >that can be placed on a large sensor has been surpassed. This is also
| >why manufacturers of DSLRS tend to use inexpensive CF memory instead of
| >smaller SD cards. After all, even though the CF card is larger, it does
| >
| >not appreciably thin out the picture more than it already comes from
| >the sensor. The Nikon D50 does use SD cards, which accounts for why its
| >pictures are brighter and sharper than those taken with the nearly
| >identical D70.
| >
| >Placing an already too thin picture from a Canon 5D on a giant CD-ROM
| >will almost guarantee very rapid fading and loss of sharpness. It is
| >the worst of both worlds.
| >
| >JPEG quality is also affected by picture size. Obviously, a photo that
| >has fewer pixels will concentrate the data more and store it in a
| >smaller area, leaving it less vulnerable to deterioration.
| >
| >So, if you want JPEG pictures that last a long time, follow these
| >simple rules:
| >
| >1) Use a pocket camera with a tiny sensor.
| >2) Use the highest compression possible.
| >3) Use the smallest picture size available for your camera.
| >4) Store it on the smallest memory card available.
| >5) Make sure there is only one copy.
|
|
| Good advice!
|
| should I store my jpegs in the refrigerator, or in an oven where they
| stay warm?
|

You store them in the microwave. Since it is designed to keep microwaves in,
it will also keep them out.
-Dave


.

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