Convert image into useable byte array in C?

Question

Does anyone know how to open an image, specifically a jpg, to a byte array in C or C++? Any form of help is appreciated.

Thanks!

Answer 1

You could try the DevIL Image Library I've only used it in relation to OpenGL related things, but it also functions as just a plain image loading library.

Answer 2

Check out the source code for wxImage in the wxWidgets GUI Framework. You will most likely be interested in the *nix distribution.

Another alternative is the GNU Jpeg library.

Answer 3

The ImageMagick library can do this too, although often it provides enough image manipulation functions that you can do many things without needing to convert the image to a byte array and handle it yourself.

Answer 4

I have my students use netpbm to represent images because it comes with a handy C library, but you can also put images into text form, create them by hand, and so on. The nice thing here is that you can convert all sorts of images, not just JPEGs, into PBM format, using command-line tools the Unix way. The djpeg tool is available a number of places including the JPEG Club. Students with relatively little experience can write some fairly sophisticated programs using this format.

Answer 5

OpenCV can also do this.

http://www.cs.iit.edu/~agam/cs512/lect-notes/opencv-intro/index.html

search for: "Accessing image elements"