how to read jpeg file

[shahzad]

I need some help on how to read a jpeg file.

[Tim]

Google

(BTW, this isn't an OS development question)

[Ozguxxx]

In order to canalize this question's context into os development, I can advice you to use bmp file or simply a rawdata image file if you are trying to show your own 1024x768 photo on screen at startup(like windows logo with windoes) since there is a lot of things(bad math ) behind jpeg stuff which is irrelevant to os programming.

[Pype.Clicker]

the 'wotsit.org' should have info about JPEG file format as it does have for virtually every other common file formats.
Also try to get a look at libjpeg's code or something ...