c language code for image read

We can't just give you code for this: it will depend on what image type you are trying to read:
.JPG internal format is totally different from .BMP for example.

C does not have the high-level routines to read an image file - you have to read the file format and process it yourself.

Reading the file is easy:

FILE *input;
char get_char;
input = fopen("myimage.bmp", "rb");
while((get_char=fgetc(input))!= EOF)
   {
   ...
   }
fclose(input);

Reads a file a byte at a time.

You will need to Google for the file format, and process it accordingly.