![]() ![]() ![]() What happens if you accidentally corrupt a media file while editing metadata?įile metadata is the information embedded into media files and documents typically hidden from user view and stored in the files as tags.How to edit or fix photo and video Metadata using ExifTool.While viewing image files on the command line is not likely to generate deep feelings of nostalgia, you can extract a lot of interesting image details that tell you about the types of images, when and where photos were taken, and what kind of device was used to take the photos. Had I included the colors in the image below, you would likely be able to recognize the penguin that is waving at you. How well this works will depend on the image itself and the tool you use. In others words, the image is displayed as characters and, for some tools, both characters and colors to replicate the image. Of course, I'm now very curious about that "Circle Of Confusion" field! More information on the exiftool output is available in an earlier column, What do your photos know about you? Viewing images in ASCIIĪnother way to look at images on the command line is to use a tool that displays image content in character format. Thumbnail Image : (Binary data 15400 bytes, use -b option to extract)įocal Length : 4.2 mm (35 mm equivalent: 26.0 mm) ![]() Interoperability Index : R98 - DCF basic file (sRGB)Įncoding Process : Baseline DCT, Huffman coding Raw Data Byte Order : Little-endian (Intel, II) Note the GPS longitude and latitude measurements near the bottom. It includes not only details about when the photo was taken, but also where it was taken. The details stored within the image file itself are incredibly extensive. ICC Profile : (Binary data 2616 bytes, use -b option to extract) Warning : Install Compress::Zlib to read compressed information In the example command below, we can see extensive details on a png file. For example, the second line below identifies the file as a png file. The first part of the file contains “meta information” (data that describes the content rather than the image content itself). However, looking beyond the first couple of lines will also display portions of the image itself that won’t be helpful. You can view some image details using the od -bc (octal dump) command. Tulip_poplar.jpg: JPEG image data, Exif standard:, baseline, precision 8, 2448x2448, components 3Īs you can see from the output above, the tulip_poplar.jpg file was taken on May 17, 2022, with a Samsung cell phone, Viewing image details using an octal dump This output includes the file type, resolution details and quite a bit of information about where the image came from and when it was taken. $ file camper.pngĬamper.png: JPEG image data, JFIF standard 1.01, resolution (DPI), density 72x72, segment length 16, Exif Standard:, progressive, precision 8, 3465x2717, components 3įor most jpg files these days, the file command will show a lot more details as in the examples above and below. The output from the file command reports this. The file below is clearly a jpg file in spite of its name. $ file Emmy.jpgĮmmy.jpg: JPEG image data, progressive, precision 8, 704x584, components 3 The file command can identify image file types by extracting data from the files themselves. ![]()
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