Why Does My Browser Download Images As Jfif

12/24/2021by admin

Active Directory can store images in JPEG File Interchange Format (JFIF) according to the jpegPhoto Attribute definition. I'd like to use this but I'd never heard of JFIF.

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First, are all JPEG files JFIFs?

You can tap Browse to choose any image file on your hard drive that's in JPG, JPEG, BMP, DIB, PNG, JFIF, JPE, GIF, TIF, TIFF, or WDP format. You can't yet do this in Edge, Microsoft's new Web. Dec 17, 2018 - A JPEG Image file might use either the JPG or JPEG file extension. JFIF files are JPEG File Interchange Format files that also use JPEG compression. You can open JPG files with your web browser like Chrome or Firefox. Why Do I Need MIME Types Like image/jpeg? Categorizing MIME types like image/jpeg into a data type such as “Image” allows your e-mail client or Internet browser to display the content as intended.

Second, does a WPF JpegBitmapEncoder produce a JFIF file? I guess if the first is true, this will be but if it's not...?

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3 Answers

JPEG = the compression algorithm (Joint Photographic Experts Group)

JFIF = the file format (JPEG File Interchange Format)

Effectively when you mention jpeg/jpg you are actually talking about JPEG/JFIF, although there is a spec for JPEG/TIFF and JPEG/EXIF (usually digital photos is where you'll see these)

A lot of the time whatever produces the EXIF file will also include what JFIF parsers need to decode properly, so it is transparent to the end user, but not entirely a 'valid' and 'to spec' EXIF file.

For internet use and transmission the default is JFIF, but not all jpegs are necessarily JFIF when you look under the covers.

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The JPEG File Interchange Format (JFIF) is an image file format standard. It is a format for exchanging JPEG encoded files compliant with the JPEG Interchange Format (JIF) standard. It solves some of JIF's limitations in regard to simple JPEG encoded file interchange. So all JPEGs are JFIF.

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I've checked Wikipedia. Apparently, JFIF is a more detailed subversion of the JPG format.

More details here...

Also, it seems that JpegBitmapEncoder supports different codecs. Thus it could be that you use a Codec that does (or does not) create JFIF files. You would have to check the codec for this.

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