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Questions tagged [jfif]

The JPEG File Interchange Format (JFIF) is an image file format standard.

JFIF is a minimal file format that enables JPEG bitstreams to be exchanged between a wide variety of platforms and applications. It does not include any of the advanced features (like tagged headers) found in the TIFF specification. JFIF conforms to the interchange format syntax specified in JPEG Standard (ISO/IEC 10918-1, Annex B); its only additional requirement is the mandatory presence of the application segment APP0 marker right after the SOI (Start of Image) marker.

JFIF_1_02 has been assigned PRONOM PUID fmt/44; the earlier versions have these PRONOM identifiers: JFIF v. 1.00, PUID fmt/42; JFIF v. 1.01, PUID fmt/43. The PRONOM Web page (consulted January 27, 2012) states that JFIF was developed prior to there being an official file format for JPEG encoding and thus JFIF "rapidly became a de facto standard." PRONOM also notes that "other types of compression are available through JPEG extensions, including progressive image buildup, arithmetic encoding, variable quantization, selective refinement, image tiling, and lossless compression, but these may not be supported by all JFIF readers and writers."

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how to set DPI using Golang?

Golang image package is very handy to some extent but lack the support to set DPI of an image. I checked the file header of generated file, FF D8 FF DB which looks like jpeg raw. AFAIK, raw doesn't come with DPI like what jfif has. So here's my…
Simon
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how to detect JFIF image type in laravel

I have laravel project that let user upload images and I can validate (jpeg/png) without problem. the problem occur when users upload JFIF-image (which consider to be images/jpeg mime types) but the laravel intervention package show message…
samer metwally
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PHP jpeg image being saved as jfif by Chrome

I have a PHP site that generates images. Doesn't matter if I use GD or Imagick header('Content-Type: image/jpeg'); imagejpeg($source); $img = new Imagick($source); $img->setImageFormat("jpeg"); header('Content-Type:…
Se7enDays
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What document contains the official numerical values for JPEG tags?

I know that the official specification for the JPEG file structure can be found at https://www.w3.org/Graphics/JPEG/jfif3.pdf but this doesn't include numerical definitions of the constants used in the specification. It only references the constants…
Ben Hutchinson
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JFIF and EXIF data structures

I'm creating a program which reads and prints out metadata from an image, but I'm struggling to get my head around the JFIF and EXIF marker structures. According to the wikipedia page for JFIF, the JFIF marker should be as follows: FF E0 s1 s2 4A 46…
131U3blue
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Facebook SDK return profile picture as JFIF, how to convert to JPG/PNG in PHP?

I'm using cURL to get an image from the Facebook SDK, but the image provided is in JFIF format. I tried to use some functions to convert it, as imagejpeg() and imagepng(), but my host don't support these. I also tried to decode the file as described…
leonardofmed
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How can I detect JPEG files by their EXIF / JFIF signature?

few days ago I asked a question in a different field and finally a friend(@emcconville) helped me with a script for "Recover every JPEG files in a single file" . Now I realized that this program only works on images with the standard "JFIF" and is…
Little Elite
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Java extract bit depth from jpeg-jfif picture

I want to extract bit depth from jpeg file. I use Metadata Extractor but it return all bit depth of all jpeg file as 8 bits but all picture have 24 bits color depth. Sample result: [JPEG] - Data Precision = 8 bits [JPEG] - Image Height = 1632…
mohammad_1m2
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Get width and height from jpeg without 0xFF 0xC0

I'm trying to get the file dimensions (width and height) from a jpeg (in this case an Instagram picture) https://scontent.cdninstagram.com/t51.2885-15/s640x640/sh0.08/e35/11264864_1701024620182742_1335691074_n.jpg As I understand if, the width and…
Joel
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Updating JFIF thumbnail in JPEG file

I am trying to update the embedded JFIF thumbnail in a JPEG File using Python. This is the (slightly hackish) method that is supposed to achieve this: def set_thumbnail(self, data): # Data of the updated thumbnail data = bytearray(data) …
jbaiter
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Possible to convert JFIF string back to an image?

I am trying to read image data from a third party RESTful API. The problem that I am running is the data is being returned in a data structure with the content type of "application/json". Is it possible to retrieve the image and convert it to a jpeg…
user1856254
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JFIF response decoding

from the beginning I'd like to apologise for my first post:) I struggling 3 days with decoding JFIF response and try visualize it in postman tab. Does anyone know how to decode response in the "air" and visualize it in postman TAB: enter image…
Kesonex
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Python Discord Embedded Message Thumbnail Not Showing .jfif Images

I have a bot that sends embedded messages with thumbnails, but I noticed that .jfif images thumbnails are not being shown. My question is does Discord support .jfif images on embedded messages thumbnails?
RonKon
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Load JFIF - Jpeg image in reactsjs

Im trying to get Microsoft photo using The following API #Get https://graph.microsoft.com/v1.0/me/photo/$value https://learn.microsoft.com/en-us/graph/api/profilephoto-get?view=graph-rest-1.0 but the response im getting the picture in encoded as…
Zaher Zaki
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How do I find a library or collection of Jpeg Headers?

I have some jpeg data which is missing the original file headers. The files don't start at the beginning of the file, they start at the data scan portion of the file and end with the file closing tag "FF D9". I might not be able to make or find a…
stacker
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