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If the image looks very grey, you could also try applying the equalizeHist on YUV image - Y channel, note that this will change the colours of the image but it might make it visually/computationally better (in some sense). A code snippet to try quickly (all _ptr are pointers to IplImage):

cvCvtColor( RGB_image_ptr, YUV_image_ptr, CV_RGB2YUV );
cvSplit( YUV_image_ptr, Ychannel_image_ptr, Uchannel_image_ptr, Vchannel_image_ptr, NULL);

cvEqualizeHist(Ychannel_image_ptr, Ychannel_image_ptr);

cvMerge( Ychannel_image_ptr, Uchannel_image_ptr, Vchannel_image_ptr, NULL, YUV_image_ptr);
cvCvtColor( YUV_image_ptr, RGB_image_ptr, CV_YUV2RGB );