This article shows repair of JPEGs that fell victim of ransomware. This particular ransomware only encrypts part of the file. Due to this the JPEG header and some 150 KB of JPEG data are lost. Using a reference file and weeding encrypted data we can repair the photo.
If you get a Unknown or invalid JPEG Marker this means one of two: The photo viewer or editor encountered a JPEG marker it isn’t familiar with. The JPEG file is corrupt. To rule out cause 1, your photo viewer editor doesn’t recognize a certain JPEG marker, update your software and if that does not help, try… Read More »
Often I am asked to repair JPEGs that can be opened but don’t display correctly. Many of those look okay for some part, but turn into a grey area at some point. Repairing these files (or recovering them as we’ll see) isn’t always straight forward and sometimes requires some detective work. Half grey photos In… Read More »
It is true that these are close to impossible to repair using PhotoShop like editors because it’s the underlying data that is corrupt. It means standard photo restoration techniques fall short as they work with the data that is available. JPEG-Repair is a tool designed to remove the corrupt data.
Probably Android phones are the most common devices to take photos with nowadays often stored on a Micro SD Card. Consequentially many lost photos will be on Android devices. Photos can be on: Internal memory (Micro) SD Card Although many want you to believe it is easy to recover the lost or deleted photos and… Read More »
JpegDigger future features. This post is mainly about entropy in JPEG data and the implementation of an entropy map in JpegDigger photo recovery software.
When you discover photos on your SD card are corrupt or the memory card itself is corrupt you should: Do as little as possible (read: nothing) with the card. Do NOT run chkdsk on the card itself! Do not format the card even if it asks you to! Instead: Create a disk image of the… Read More »
Unfortunately it is a common problem that you are unable to open recovered photos after using file recovery, undelete or photo recovery software on a SD card. In this post I will make some assumptions: Photos are on a memory card and therefor: File system is a variation of FAT (FAT32, exFAT) File type is… Read More »
Not a week goes by where I am not confronted with loss of digital photos caused by fake memory cards. The sad news is that as these photos were never actually saved to the card they can’t be repaired nor recovered by tools like JPEG-Repair or JPEG Recovery LAB. A 32 GB card that you… Read More »
JPEG visual corruption In general there are two kinds of symptoms that indicate a JPEG image is corrupted: Photo can not be viewed at all; Windows Explorer fails to display thumbnails JPEG can be opened but there is visual corruption in one form or the other In case 1 it is safe to assume at… Read More »