Bill Clark
Veteran
From Wikipedia:
As I understand from reading this Exif is:
Exchangeable image file format (Exif, often incorrectly EXIF) is a standard that specifies the formats for images, sound, and ancillary tags used by digital cameras (including smartphones), scanners and other systems handling image and sound files recorded by digital cameras. The specification uses the following existing file formats with the addition of specific metadata tags: JPEG Discrete cosine transform (DCT)[1] for compressed image files, TIFF Rev. 6.0 (RGB or YCbCr) for uncompressed image files, and RIFF WAV for audio files (Linear PCM or ITU-T G.711 μ-Law PCM for uncompressed audio data, and IMA-ADPCM for compressed audio data).[2] It is not supported in JPEG 2000, PNG, or GIF.
Exif format is being use for other information such as geolocation tags.
Since the Exif tag contains metadata about the photo, it can pose a privacy issue. For example, a photo taken with a GPS-enabled camera can reveal the exact location and time it was taken, and the unique ID number of the device - this is all done by default - often without the user's knowledge. Many users may be unaware that their photos are tagged by default in this manner, or that specialist software may be required to remove the Exif tag before publishing. For example, a whistleblower, journalist or political dissident relying on the protection of anonymity to allow them to report malfeasance by a corporate entity, criminal, or government may therefore find their safety compromised by this default data collection.
Metadata:
Metadata is a term for the descriptive information embedded inside an image or other type of file. Metadata is becoming increasingly important in this age of digital photos where users are looking for a way to store information with their pictures that is portable and stays with the file, both now and into the future.
The metadata tags defined in the Exif standard cover a broad spectrum:
Date and time information. Digital cameras will record the current date and time and save this in the metadata.
Camera settings. This includes static information such as the camera model and make, and information that varies with each image such as orientation (rotation), aperture, shutter speed, focal length, metering mode, and ISO speed information.
A thumbnail for previewing the picture on the camera's LCD screen, in file managers, or in photo manipulation software.
Descriptions
Copyright information.
The reason I bring this up, is that in Bridge I can show a folder with Metadata information. The assumption I'm making is this is the information most of us would need, look at, use as a reference.
Any comments or corrections?
As I understand from reading this Exif is:
Exchangeable image file format (Exif, often incorrectly EXIF) is a standard that specifies the formats for images, sound, and ancillary tags used by digital cameras (including smartphones), scanners and other systems handling image and sound files recorded by digital cameras. The specification uses the following existing file formats with the addition of specific metadata tags: JPEG Discrete cosine transform (DCT)[1] for compressed image files, TIFF Rev. 6.0 (RGB or YCbCr) for uncompressed image files, and RIFF WAV for audio files (Linear PCM or ITU-T G.711 μ-Law PCM for uncompressed audio data, and IMA-ADPCM for compressed audio data).[2] It is not supported in JPEG 2000, PNG, or GIF.
Exif format is being use for other information such as geolocation tags.
Since the Exif tag contains metadata about the photo, it can pose a privacy issue. For example, a photo taken with a GPS-enabled camera can reveal the exact location and time it was taken, and the unique ID number of the device - this is all done by default - often without the user's knowledge. Many users may be unaware that their photos are tagged by default in this manner, or that specialist software may be required to remove the Exif tag before publishing. For example, a whistleblower, journalist or political dissident relying on the protection of anonymity to allow them to report malfeasance by a corporate entity, criminal, or government may therefore find their safety compromised by this default data collection.
Metadata:
Metadata is a term for the descriptive information embedded inside an image or other type of file. Metadata is becoming increasingly important in this age of digital photos where users are looking for a way to store information with their pictures that is portable and stays with the file, both now and into the future.
The metadata tags defined in the Exif standard cover a broad spectrum:
Date and time information. Digital cameras will record the current date and time and save this in the metadata.
Camera settings. This includes static information such as the camera model and make, and information that varies with each image such as orientation (rotation), aperture, shutter speed, focal length, metering mode, and ISO speed information.
A thumbnail for previewing the picture on the camera's LCD screen, in file managers, or in photo manipulation software.
Descriptions
Copyright information.
The reason I bring this up, is that in Bridge I can show a folder with Metadata information. The assumption I'm making is this is the information most of us would need, look at, use as a reference.
Any comments or corrections?
Terry Christian
Established
You're correct. EXIF is the data that is stored in the image file by your camera and retrievable in the software with which you digitally process the image. Metadata is a more umbrella term, since it covers not only EXIF data but also any tags you may add during processing, e.g. keywords or copyright information.
ColSebastianMoran
( IRL Richard Karash )
Camera and lens serial numbers are often there. GPS location most of the time from smart phones. My dSLR let's me put a copyright notice in every image file. Thanks for the reminder that all this is personally identifying information.
Here's what I do: On my Mac, open the photo in Preview. Select all. Copy. Then Cmd-N to start a new file; new file opens automatically with the image but none of the metadata. Save as jpg and you have an image that's anonymous. I think the only metadata is file creation date, color space, and dpi. Comments? Does this eliminate the personal info?
Here's what I do: On my Mac, open the photo in Preview. Select all. Copy. Then Cmd-N to start a new file; new file opens automatically with the image but none of the metadata. Save as jpg and you have an image that's anonymous. I think the only metadata is file creation date, color space, and dpi. Comments? Does this eliminate the personal info?
Sejanus.Aelianus
Veteran
You can use "The Gimp" to edit EXIF and other metadata. 2.8.4 on OS-X works very nicely.