Reviewing thousands of photos from a trip to Italy, I was sorting them into Best/OK/Bad directories using the "Move" hotkeys (F7).
When I looked at the files, I notice the sizes had changed on the moved files! (JPEG only - not the RAW files)
BEFORE: 7.93 MB (8,317,440 bytes)
AFTER: 7.08 MB (7,427,796 bytes)
So it lost almost 20% of the file!
Visually, it is not obvious what changed, as the files are 16MP files, and to bring 2 up on a monitor reduces the resolution too much to tell anything side-by-side.
This happened on pretty much every file.
These were images from a Panasonic Lumix GX7 - not sure if that would matter.
Computer is Windows 7 Pro/SP1, 64-bit, with 8GB RAM, 4-core CPU, with not much else going on.
Very repeatable.
IrfanView 4.38.
Here is a sample pair (before & after) (UPDATE: added RAWs, which do NOT change):
What's going on?
When I looked at the files, I notice the sizes had changed on the moved files! (JPEG only - not the RAW files)
BEFORE: 7.93 MB (8,317,440 bytes)
AFTER: 7.08 MB (7,427,796 bytes)
So it lost almost 20% of the file!
Visually, it is not obvious what changed, as the files are 16MP files, and to bring 2 up on a monitor reduces the resolution too much to tell anything side-by-side.
This happened on pretty much every file.
These were images from a Panasonic Lumix GX7 - not sure if that would matter.
Computer is Windows 7 Pro/SP1, 64-bit, with 8GB RAM, 4-core CPU, with not much else going on.
Very repeatable.
IrfanView 4.38.
Here is a sample pair (before & after) (UPDATE: added RAWs, which do NOT change):
What's going on?
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