WHAT IS EXIFTOOL MAC
Some Mac applications attach this monitor-specific profile to pictures. This new profile contains a timestamp that identifies when the monitor was calibrated. Similarly, if you adjust the display colors on a Mac, then the Mac generates a new ICC Profile. However, if the picture is supposed to be direct from a camera and it contains this Facebook indicator, then you can question why the picture isn't from a camera and why it went through Facebook.
At best, it tells you that the picture was uploaded to Facebook on or after that date (and likely long after that date).
It doesn't tell you when the picture was uploaded to Facebook, and it doesn't identify when any modifications were made. This timestamp doesn't tell you when the picture was created. With Facebook, the ICC Profile says "Copyright: FB" (FB for Facebook) and the ICC Profile's timestamp denotes when Facebook created the profile (many years ago). Some photo sharing services, like Facebook, automatically attach an ICC Profile to pictures. To be clear: the only information that can be deduced from the ICC Profile's timestamp is (1) the ICC Profile was generated at that time (assuming the timestamp is accurate), (2) it was added by an application (assuming it isn't one of the extremely rare cameras that natively embeds a color profile), and (3) it was added to the picture some time after it was generated. Unfortunately, it is common for users to view the metadata, see the ICC Profile timestamp, and assume that the picture is fake because the picture doesn't depict an event that happened when the ICC Profile was created. An ICC Profile is virtually never added by a camera.)īecause an ICC Profile is generated independently of the picture it is attached to, the timestamp in the ICC Profile identifies when the profile was created - and not when it was attached to the picture or when the picture was photographed. (I say "virtually no digital cameras" because there are one or two high-end cameras that natively attach ICC Profiles when the picture is captured, and even those are disabled by default. When you see a picture with an ICC Profile included as metadata, you should immediately assume that it was added by an application. Virtually no digital cameras natively embed an ICC Profile metadata block. When an ICC Profile is applied, the "red" seen on one monitor will look the same as the red on another monitor and as close as possible to the same color when the picture is printed.
WHAT IS EXIFTOOL HOW TO
The ICC Profile metadata block defines how to adjust the picture's coloring. And it concerns one specific type of metadata: the ICC Profile. Over the last month, there has been one big mistake that I've repeatedly seen. For example, what does a field named "Date/Time" represent? Depending on the metadata block, it could be when the file was created, when it was last modified, when the metadata was added, or when the event depicted in the photo occurred. Often, the field has a well-defined name that is documented in a formal standard, but the field's name can still be confusing. However, determining the purpose of a field may be non-intuitive. Within each type of metadata are sets of data fields, and each field has a name. The various fields within the metadata increase the complexity. Just identifying what created a particular metadata block may be difficult. Some of these metadata structures come from cameras, while others come from applications. A single picture may contain EXIF metadata, JFIF metadata, XMP, MPF, and other types of metadata. Problems occur when analysts don't take the time to identify what created the different pieces of metadata, what the metadata components describe, and what the programs that extract metadata are really showing.ĭifferent types of metadata come from different sources. While there are lots of tools that display metadata, they do not all display the same things, and there are a few things that makes evaluating metadata complicated. Evaluating metadata requires more than just loading a picture and pushing a button.
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