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, ...
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  • 140k
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 ...
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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 ...
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  • 19.9k
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 ...
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  • 4,113
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 ...
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  • 383
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. ...
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  • 986
4 votes

JPEG image problem

If your intention is to modify the JPEG file by changing some bytes inside it, just do the following: convert JPEG to uncompressed BMP change the bytes convert BMP to JPEG
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  • 4,845
4 votes

JPG Images recovered immediatelly after deleting from SSD, but 95% of files can't be opened

An important detail that hasn't been mentioned thus far is how file deletion is (usually) done on SSDs. It is different than the traditional, spinning-disk, hard disk drives (HDDs). As mentioned in ...
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  • 851
4 votes
Accepted

Why are my RAW images corrupt but the previews okay?

What you're seeing is consistent with data corruption in that the preview lo-res jpeg is fine, and that the compressed raw has a number of incorrect or missing bytes causing corruption. The question ...
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  • 9,440
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 ...
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  • 2,903
4 votes
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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 ...
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  • 19.9k
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 ...
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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 ...
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  • 168k
3 votes

Nikon D60 shooting corrupt .nef files

You've tested with multiple cards/readers. That's definitely indicative of a problem with the camera itself. Some additional tests are:- plug a cable into the camera directly. copy the files to a ...
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  • 9,440
3 votes

Nikkon DSLR messing up SD Cards

I know that when you repeatedly remove/insert an SD card it can leave "lines" on the gold contacts of the SD card itself but I haven't had any issue with it for over a year (if I'm understanding what ...
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  • 2,003
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: exiftool -all= -tagsfromfile @ -all:all -unsafe -...
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  • 43
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 : ...
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  • 4,113
2 votes

JPEG image problem

You've deliberately vandalised a compressed file, there is no way to recover the data except for you to put back what you've broken. Image recovery tools are built to work by taking blocks of data ...
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  • 9,440
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 ...
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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 ...
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  • 140k
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 ...
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  • 2,288
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 ...
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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 ...
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  • 140k
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, ...
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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 ...
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  • 168k
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 ...
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  • 51
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 ...
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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 ...
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  • 168k
1 vote

Is corruption in digital images always easily recognized?

Most of the time, yes, but you can't count on it. A single flipped bit in a image file will usually make a mess due to the image encoding. It's rare that images are just verbatim dumps of pixel data,...
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1 vote

Why do photos get corrupted on PC hard disks?

Photo files aren't special in this regard, any file on a computer can get corrupted. JPEGs are probably more likely to show up corruption in an obvious way than a lot of other files types though, so ...
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  • 591

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