Convert an IplImage to SDL_Surface with single nChannals

Question

How to convert an IpLImage to SDL_Surface.

I used this postto convert an image with 8 nChannels and it worked perfectly, but when I try this with an image of a single nChannel it displays the following message on the console:

 Depth 8, nChannels 1, pitch 640
 Unable to convert the IplImage image ! SDL Error: Unknown pixel format

And this is the code I used :

int pitch = colored_capture->nChannels * colored_capture->width;
printf("Depth %d, nChannels %d, pitch %d\n", colored_capture->depth,
                colored_capture->nChannels, pitch);

surface_1 = SDL_CreateRGBSurfaceFrom((void*)colored_capture->imageData,
                       colored_capture->width,
                       colored_capture->height,
                       colored_capture->depth * colored_capture->nChannels,
                       colored_capture->widthStep,
                       0x0000ff, 0x00ff00, 0xff0000, 0);

if (surface_1 == NULL)
{
   fprintf ( stderr ,"Unable to convert the IplImage image ! SDL 
Error: %s \n", SDL_GetError());
}