MIME type is a way to classify the data type of a file. MIME stands for "Multipurpose Internet Mail Extensions." It is an extension of the Internet e-mail standard that defines the different types of content that can be attached to e-mail messages. MIME is commonly used when sending attachments and provides information about the data type, size, and encoding of an attachment. The MIME type indicates what kind of data the attachment contains, for example: text/plain or image/jpeg.

Are the MIME type and file extension the same?

No, the MIME type and the file extension are not the same. The MIME type is only a text string that identifies what kind of content is being transmitted. The file extension is a code that tells the computer which application to use to open the document. Usually, the file extension is corresponding to a certain mime type. But sometimes it can not match, for example when someone changes a file extension manually.

When is useful to know MIME type of file?

Knowing the MIME type of a file is useful when you need to know how to handle it. For example, if you want to upload a file to the web server, knowing its MIME type will help you determine which format is appropriate. MIME types are used by email clients and web browsers to determine what type of content they are handling.

How can I check the file's MIME type?

There are two ways to check the MIME type of a file. The first is to use your operating system's built-in commands. The second way is to look for an extension that matches the file type. For example, ".txt" for plain text files and ".pdf" for PDF files. Or you can use our online tool, which can make this job easy and faster.

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About PGM format

Grayscale image file format

A Portable Gray Map (PGM) file is a grayscale image that can be encoded with 8 or 16 bits per pixel. A PGM file can be stored in text format (an ASCII data block) or as binary data. This can be determined by the file header.

PGM (Portable Gray Map) files store grayscale 2D images. Each pixel within the image contains only one or two bytes of information (8 or 16 bits). While that might not sound like a lot of information, PGM files can hold tens of thousands of shades — ranging from pure black to white, and every shade of gray in between.

The Export PGM File command allows the user to export any loaded elevation grid data sets to a PGM grayscale grid file. These grid files can be used with any software application that supports PGM files. When selected, the command displays the PGM Export Options dialog which allows the user to setup the export.

Both image viewer and photo-editing programs can convert PGM files into other types of photo files. Open the PGM file and then click Save As. Several options will be available.

Note that you can use pamdepth to convert between a the format with 1 byte per gray value and the one with 2 bytes per gray value. There is actually another version of the PGM format that is fairly rare: "plain" PGM format. The format above, which generally considered the normal one, is known as the "raw" PGM format.

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