Storing pics on CD / DVD · AditNow Community

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Barney
50.2% (Neutral)
Newbie Topic Starter

18 years ago

What advantages or disadvantages are there when choosing to save pics on CD or DVD?

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grahami
50.2% (Neutral)
Newbie

18 years ago

Probably better for archive storage - put away somewhere they will not be subject to scratching, pressure, excesses of heat & light etc.

I understand there is some concern in professional archaeological circles about the long term viability of optical storage of this type, compared to say, 35mm film, after all technologies change, and our writable cds and dvds have not been around very long at all yet.

Hard disks can (and do!) fail - recovery of data from one can be very expensive. So don't rely on them alone for storing your precious images.

Tricky - I'm not entirely happy about the answer yet myself. Fortunately (?) most of my IA stuff is on film, so I've still got that as well as my scans of them, but even film can only last so long - and my slides have not stood the test of time as well as my negatives, probably due to poorer protection.

Graham

The map is the territory - especially in chain scale.

grahami
50.2% (Neutral)
Newbie

18 years ago

Oh yes - I forgot - the version on a CD has one advantage that it cannot be changed. Every time you open a .jpg make even a minor alteration to it (cropping, litening etc.) and save it again, you lose a little of the data due to the compression. To prove it open an image, draw a single pxel width line on it with a paint program , save it, close it and repeat several times - the line will eventually blur into the surroundings. So the image on a CD is good as a reference image which will not alter.

Graham

The map is the territory - especially in chain scale.

JohnnearCfon
50.2% (Neutral)
Newbie

18 years ago

"grahami" wrote:
Oh yes - I forgot - the version on a CD has one advantage that it cannot be changed. Every time you open a .jpg make even a minor alteration to it (cropping, litening etc.) and save it again, you lose a little of the data due to the compression. To prove it open an image, draw a single pxel width line on it with a paint program , save it, close it and repeat several times - the line will eventually blur into the surroundings. So the image on a CD is good as a reference image which will not alter.

Graham

I always save original before even making a minor alteration. Even turning the image round (ie if you took the photo as a portrait format photo it will appear on PC screen "sideways" so you have to alter it on screen to look at, [alternative turn head or PC on side]) and then saving it will result in a certain amount of file compression.

Barney
50.2% (Neutral)
Newbie Topic Starter

18 years ago

Thanks for the advice folks, I didnt word my original question very well-Whats the difference between storing on CD to storing on DVD?

Barney leaves for english lessons! 😞

JohnnearCfon
50.2% (Neutral)
Newbie

18 years ago

I seek not only to understand the answers, but also understand the question! :lol: :lol:

I now HAVE to back up my photographs on DVD as they won't fit on CD!

As far as I know (and I am happy to be corrected) the main difference is capacity. A CD takes about 750Mb A DVD takes 4.5Gb. Oh, and a DVD is slightly thicker.

Whilst on the subject of formats etc. I believe DVD-R is slightly better than DVD+R also both formats of RW are inferior to R. In otherwords DVD-R is best, DVD+R is nearly as good, DVD-RW and DVD+RW are not as good as either of above.