program for reading a image file using C

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Dear All,

I need C program to a JPG formated image, and i have convert it to uncompressed image, please help me to the same.

Posted 8-Apr-12 0:15am

chouke

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enhzflep · Answer 1 · 2012-04-08T00:47:00

I've read that there is about 1 man-year's worth of work to create a jpeg encoder/decoder.

Must you use C, or can you use C++?

GdiPlus(C++) will allow you to open/save files with a small addition of code to your project. This is a included part of Windows since XP. (gdiplus.h gdiplus.lib)

Steps:

Create gdiPlus::Bitmap, load it with your image file
Create a HBITMAP from this bitmap
GetDibBits on this HBITMAP
Clean-up result, removing padding bytes (if present) from end of each scan-line.

Note: init/shutdown of gdiPlus ommited for brevity

Failing that, you may choose to review jpegLib (dunno if it's c or c++)

nv3 · Answer 2 · 2012-04-08T01:41:00

Solution 2

There is an excellent library here on CodeProject that lets you read JPEG files and convert it into almost anything. This link

CxImage

will get you there. It is a C++ library, though. If you need pure C code, you could try to extract the essential parts and back-convert them to C.

Hope that helps.

Posted 8-Apr-12 1:41am

nv3

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enhzflep 8-Apr-12 8:39am

Just checked, the CxImage package actually includes jpegLib.

jpegLib is itself plain ol' C. :)

nv3 8-Apr-12 9:18am

Oh, good. In that case jpeglib should do the job. Got my 5.