![]() I am using CentOS 8 to demonstrate this and the epel(Extra Packages for Enterprise Linux) repository is needed: $ sudo yum install -y On Fedora and CentOS: $ sudo dnf install imagemagick -y ![]() Installation on Ubuntu, Debian, and Mint: $ sudo apt install imagemagick -y We can do this using a tool called identify which is part of the ImageMagick package. Let’s go deeper, let’s get more metadata. This is the basic metadata that the file command can output. We see the picture was last modified on 28 June 2021, at 23:19:23, it was taken using a Nikon camera, model D750, it has a 4016×6016 pixels size and someone used a Windows version of the Adobe Photoshop 22.2 software to edit it. We can clearly spot some general info which can be understood regardless of your computers or photography knowledge. Image.jpg: JPEG image data, JFIF standard 1.01, aspect ratio, density 300x300, segment length 16, Exif Standard:, baseline, precision 8, 4016圆016, frames 3 The file I am using in this tutorial is simply called image.jpg and we are about to find a lot of details about it. file is used to determine the type of any file in Linux. The easiest tool and, generally, included in every Linux distribution and version is file. One important thing to keep in mind is that metadata validity is not bulletproof, it can easily be removed or modified. Knowing these details helps you understand that metadata is important for sorting, searching, analyzing, licensing, and, why not, learning photography or image editing details and techniques. Other descriptive info could be the photographer’s name, the picture title, the collection it is part of, etc. – Descriptive metadata – is, most of the time, manually added at a later stage, but some modern cameras can automatically include exact location by using GPS capabilities. This info is generated by the camera when the picture is taken. Strictly related to image files, metadata provides information that can be divided into 3 categories: – Administrative metadata – includes copyright info, details about the owner, type of license, and permitted usage terms – Technical metadata – the exact characteristics of the photograph, including, but not limited to: camera manufacturer and model image resolution, format, and size photographer “secrets” – ISO, shutter speed, white balance, lens aperture. It can be used to index multiple files in a database collection or table, it makes it easier to categorize and return search results based on a custom query. ![]() Think about it as information that describes a file and provides a deeper understanding of the data you are looking at. These latter features may be used to override decisions made by apt-get's conflict resolution system.Metadata is basically data about data. Similarly a plus sign can be used to designate a package to install. If a hyphen is appended to the package name (with no intervening space), the identified package will be removed if it is installed. The /etc/apt/sources.list file is used to locate the desired packages. All packages required by the package(s) specified for installation will also be retrieved and installed. Each package is a package name, not a fully qualified filename. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from precompiled files or by compiling source code.Īpt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library.Īpt-get install is followed by one or more packages desired for installation or upgrading. More information about install using apt-getĪdvanced Package Tool, or APT, is a free software user interface that works with core libraries to handle the installation and removal of software on Debian, Ubuntu and other Linux distributions. Library and program to read and write meta information in multimedia files
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