Image Size and Compression.
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From: Outing Trolls is FUN! on 2 Aug 2010 22:18 On Tue, 3 Aug 2010 01:40:12 +0200, Wolfgang Weisselberg <ozcvgtt02(a)sneakemail.com> wrote: >Ryan McGinnis <digicana(a)gmail.com> wrote: >> On 7/31/2010 3:42 PM, Wolfgang Weisselberg wrote: >>> Ryan McGinnis <digicana(a)gmail.com> wrote: > >>>> incredibly cheap and getting cheaper by the hour. If you are not >>>> shooting RAW, a terabyte drive will hold more photos than you're likely >>>> to take in your lifetime on a 10MP camera, and they run around $150. > >>> A proper backup concept will cost much more than $150. > >> Depends how you run it. > >Well, there's secure and there is cheap, choose one and the >opposite of the other. > >> I go with one primary drive and one secondary >> drive for temp backups of new stuff. Every month or so I archive the >> new stuff to two sets of DVDs, delete it off of the secondary drive, and >> place one set of DVDs in a bank vault. DVDs are pretty cheap. > >I've seen enough burned DVDs to only trust them when read back, >compared with the original, checked for reading problems (minimum: >reading speed graph), and backed with dvdisaster[1]. And then I >don't trust them very far --- a yearly check might well be needed >for long term storage. > >So you'd spend much time handling DVDs which has also costs, >in time, if not in dollars. > >-Wolfgang > >[1] http://dvdisaster.net/en/ You don't seem to have much experience with optical recording media either. Or are just as sloppy at that as you are with your wild imaginings about cameras that you've never owned and photography that you've never done. I have plenty of CDs burnt from 12-13 years ago. Even RW ones. They all read just fine every time I have to grab something from them. Just store them properly. More importantly: Make sure too when burning any optical media that the media is perfectly pristine to begin with. No fingerprints, no dust, no hairs on the recording side. Keep a microfiber cloth handy near your stack of recordable discs so you can clean them as clear as you would your camera lens before use, if you spot a fingerprint or something on them. If you must clean off a fingerprint or speck of dust, never wipe the disc in a circular direction, always radially from center to edge just in case the dust-speck, or other, might create fine scratch in the surface. A fine scratch in parallel with the tracks on the media could severely alter the position and shapes of the pits in a recorded track. A fine scratch running perpendicular to the recording path is easier for the laser to skip over and not induce eccentricities in the recorded data. Due to using a laser those pits are recorded holographically. If you burn a disc with anything between the laser and the recording layer, then later remove that debris, the laser can't see the pits as well that were altered by that dust or grit during recording. If you were you able to restore the *exact* same fingerprints or dust on that disc, then the laser could see those pits again. Extra grunge or scratches on the surface after recording (within reason) are okay, because the pit was recorded clear and crisp. The laser can "see around" it. The converse not true if the pits were recorded with the intervening crud-data encoded into the pits' shapes and positions too, and later that surface-data (grunge) was altered. |