Get RGB pixels from input image and reconstruct an output image in opencv

Question

I want to load the image in opencv and split the image into channels(RGB) and i want to increase any one of the colors and getting that corresponding output image.is there a

Answer 1

Another option is to manually iterate on the pixels of the image and work on the channel that interests you. This will give you the flexibility to manipulate each channel individually or as a group.

The following code uses the C interface of OpenCV:

IplImage* pRGBImg = cvLoadImage("test.png", CV_LOAD_IMAGE_UNCHANGED); 
int width = pRGBImg->width; 
int height = pRGBImg->height;
int bpp = pRGBImg->nChannels; 
for (int i=0; i < width*height*bpp; i+=bpp) 
{
  // For educational puporses, here is how to print each R G B channel:
  std::cout << std::dec << "R:" << (int) pRGBImg->imageData[i] <<  
                          " G:" << (int) pRGBImg->imageData[i+1] <<  
                          " B:" << (int) pRGBImg->imageData[i+2] << " "; 
}

However, if you want to add a fixed value to a certain channel you might want to check @Popovici's answer.