21 votes
Accepted

Google Photos high quality backup -- how does Google achieve great compression and am I losing some data?

Well, for one thing, all photos larger than 16 megapixels are resized to 16 MP — so, for many cameras today, that's an immediate, obvious drop in resolution. But all other photos are compressed too, ...
mattdm's user avatar
  • 143k
17 votes
Accepted

Why do photos get corrupted on PC hard disks?

There are two main causes. The first is data degradation. Bits stored on magnetic media (such as your hard disk) can lose their magnetic orientation over time, corrupting the bit. In harsher ...
alldayremix's user avatar
17 votes

Why do photos get corrupted on PC hard disks?

I'm not going to worry too much about how this happens, because hard disks will fail; just like anything else in this world, they aren't perfect. You can't get to a state where you're never going to ...
Philip Kendall's user avatar
  • 21.9k
6 votes

Google Photos high quality backup -- how does Google achieve great compression and am I losing some data?

They are basically throwing processing power at the problem, using very compute intensive approaches that tries out various ways to compress the image within the JPG rules. Processing is something ...
TomTom's user avatar
  • 393
6 votes
Accepted

Corrupted JPG has undesired color bars overlay

Short Answer : you may be lucky ! As you supposed, it seems that you have indeed experienced some corruption(s) during the transfer. Technically speaking, a JPG is made of tiny blocks of pixels ...
Olivier's user avatar
  • 4,173
5 votes

Does using multiple smaller memory cards decrease the probability of losing data?

There may not be a definitive answer. Some arguments for using fewer, larger cards: Less card swapping. When using small cards, you could potentially miss the shot because you have to swap cards. ...
crunch's user avatar
  • 996
5 votes

Something is corrupting my jpegs. How can I trace what did this?

In general, you cannot determine which application last changed a file (whatever the file, image, spreadsheet...). You can have a clue that the file has been changed by an application because usually ...
xenoid's user avatar
  • 21.3k
4 votes
Accepted

How do you deliberately corrupt an image?

Try a web search for "Hex editor". There are several around, including some free ones. They can display the values of the bytes making up the file as (ususally) hexadecimal (base 16) values - each 8 ...
JerryTheC's user avatar
  • 3,023
4 votes
Accepted

What's causing large artifacts in some of my digital pictures?

As this occurred only to the RAW files and not the JPEG copies of the same photo, that means by far the most likely explanation of the error is that your SD card is giving up. Throw it away, get a new ...
Philip Kendall's user avatar
  • 21.9k
4 votes

odd raw file corruption

My first guess off the top of my head is corrupted SD card (or similar media) because it reminds me of a similar problem I once had because of one. The card itself was fine after I reformatted it. It ...
Bob Macaroni McStevens's user avatar
3 votes
Accepted

Can I keep using a corrupted SD card?

Can I keep using a corrupted SD card? Well, you could. But you might not like the results from doing so. Based on the rest of your description, though, before you toss the card you probably need to ...
Michael C's user avatar
  • 175k
3 votes

ExifTool does not extract corrupted EXIF metadata from jpeg file. How to repair it?

(In addition to Romeo Ninov's great answer) There is an Exiftool FAQ alternative, that tries to repair JPEG file-metadata and preserve existing tags: ...
ramo's user avatar
  • 43
2 votes

Why do photos get corrupted on PC hard disks?

The answer to the why this happens depends on the type of drive, type of file, filesystem and operating system used, so it's impossible to give a complete answer to this question. But regarding how ...
Harry Harrison's user avatar
2 votes
Accepted

Does using multiple smaller memory cards decrease the probability of losing data?

Smaller memory card requires switching cards more often, which can be a limitation. The SanDisk CompactFlash Memory Card Product Manual (available SanDisk CompactFlash Memory Card Product Manualhere : ...
Olivier's user avatar
  • 4,173
2 votes

Is corruption in digital images always easily recognized?

No. It's possible for a bit to be flipped which has no immediately obvious effect. In fact, it's possible for a data error to have no visual effect at all. If reasonably-sized blocks are missing or ...
mattdm's user avatar
  • 143k
2 votes
Accepted

How to find corrupt CR2 files?

This has gone unanswered for along time so I'll take a shot at a summary. Most raw files, including as best I know Canon, do not include a checksum in the original file as delivered by the camera, so ...
Linwood's user avatar
  • 2,363
2 votes

Possible cause for corrupted images (colored stripe with dots in pictures)?

If the location is really identical, or a few locations that repeat, this is most likely a sensor problem - probably a solder joint or bond wire that became intermittent. Might be mitigated by ...
rackandboneman's user avatar
2 votes

Transferred files from Canon camera, now files are corrupted (?)

It seems that the file transfer process from the card to the computer was not error-free. The problem may be with the card, the card reader, contacts... If you still have the pictures on the card, ...
Old Aperture's user avatar
2 votes

Photos in my SD Card suddenly disappeared and now I cannot recover

Since you've tried multiple readers and computers, and since you've tried card recovery software, I'm afraid the most likely thing is that the card went bad and you've lost the photos. If the photos ...
mattdm's user avatar
  • 143k
2 votes

Corrupted Photo format

A lot of times recovery applications will find raw files and misidentify them as more standard .tiff files. Often all one needs to do is change the file extensions from .tiff back to the original ...
Michael C's user avatar
  • 175k
2 votes

odd raw file corruption

Thanks, All! After a bit more digging... The corruption IS in the .dng files, so not in the LR previews. So suspect it is a hardware problem. I have about 50K images (from 2005 to today) and so far ...
dave231's user avatar
  • 51
2 votes

Is there a way to repair corrupt raw files? (RW2 and NEF) The data seems to be there, but it is in pink and at different places

In my experience this type of damage is unfixable in RAW photos unless the entire image looks 'off'. For example I have been able to repair files like this where entire image looks distorted with NEF ...
Joep van Steen's user avatar
2 votes

CR2 files corrupted after moving from CF card

Before using the card again, I would try to save any images that may be found on the card with a file recovery program.
Teromaa's user avatar
  • 51
2 votes
Accepted

CR2 files corrupted after moving from CF card

Is there any chance to fix the corrupted files? There might be a slim chance that would be very involved, but I wouldn't bet on success. It seems like you may be having issues with the hard drive in ...
Michael C's user avatar
  • 175k
2 votes
Accepted

Photo and Video recovery?

Sorry to be the bearer of bad news, but the most likely scenario here is that your files are toast. A specialist data recovery company might be able to do something with the original drive and maybe ...
Philip Kendall's user avatar
  • 21.9k
1 vote

How to recover corrupted photo files?

If you open the NAS with your file explorer: Is the directory structure intact (ie, can you see the directories you have set up?) Are the size of the files (and possibly their time stamps) coherent ...
xenoid's user avatar
  • 21.3k
1 vote

Camera sometimes stores unreadable .MOV instead of .JPG

A .MOV file is a movie video. You select video mode with the rotary Mode switch on top of your camera, which must have been accidently moved. See your Extended User Manual page 9 about it: http://...
WayneF's user avatar
  • 12.9k
1 vote

Possible cause for corrupted images (colored stripe with dots in pictures)?

I use Photos software on a Macintosh for import and storage of pics, and just started having the same problems after changing from a D7000 to a D7500. Same line in the images in Photos. If I export ...
Bill the pumpkin thief's user avatar
1 vote

NEF seemingly corrupt except in ViewNX-i - how to repair?

Upon inspection with the free command-line ExifTool it appears that the image I referred to in the question contains a valid full-size JPEG image as well as a corrupt RAW image. The JPEG image was ...
ShutterFreak's user avatar
1 vote

Canon error message: "Card cannot be accessed. Reinsert/Change the card or format card with camera"

If you can't format the card directly in the camera because the camera refuses to recognize it, try formatting it with a computer first. For a 32GB SD card use the FAT32 file system when you format ...
Michael C's user avatar
  • 175k

Only top scored, non community-wiki answers of a minimum length are eligible