Reading an image file in C C

Question

I need to read an image file in C C    It would be very great  if some one can post the code for me   I work on gray scale images and the images are JPEG  I would like to read the images into a 2D array which will make my work easy

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Check out Intel Open CV library

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corona is nice  From the tutorial   corona  Image  image   corona  OpenImage  img jpg   corona  PF R8G8B8A8   if   image         error     int width    image- gt getWidth    int height   image- gt getHeight    void  pixels   image- gt getPixels        we re guaranteed that the first eight bits of every pixel is red     the next eight bits is green  and so on    typedef unsigned char byte  byte  p    byte  pixels  for  int i   0  i  lt  width   height    i      byte red      p      byte green    p      byte blue     p      byte alpha    p        pixels would be a one dimensional array  but you could easily convert a given x and y position to a position in a 1D array  Something like pos    y   width    x

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Try out the CImg library   The tutorial will help you get familiarized   Once you have a CImg object  the data   function will give you access to the 2D pixel buffer array

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Check this thread out  read and write image file   Also  have a look at this other question at Stackoverflow

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Check out the Magick   API to ImageMagick

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You could write your own by looking at the JPEG format   That said  try a pre-existing library like CImg  or Boost s GIL  Or for strictly JPEG s  libjpeg  There is also the CxImage class on CodeProject   Here s a big list

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If you decide to go for a minimal approach  without libpng libjpeg dependencies  I suggest using stb image and stb image write  found here   It s as simple as it gets  you just need to place the header files stb image h and stb image write h in your folder    Here s the code that you need to read images    include  lt stdint h gt    define STB IMAGE IMPLEMENTATION  include  stb image h   int main         int width  height  bpp       uint8 t  rgb image   stbi load  image png    amp width   amp height   amp bpp  3        stbi image free rgb image        return 0      And here s the code to write an image    include  lt stdint h gt    define STB IMAGE WRITE IMPLEMENTATION  include  stb image write h    define CHANNEL NUM 3  int main         int width   800       int height   800       uint8 t  rgb image      rgb image   malloc width height CHANNEL NUM           Write your code to populate rgb image here      stbi write png  image png   width  height  CHANNEL NUM  rgb image  width CHANNEL NUM        return 0      You can compile without flags or dependencies   g   main cpp   Other lightweight alternatives include    lodepng to read and write png files jpeg-compressor to read and write jpeg files

[c++] Reading an image file in C/C++

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