Detect images in grayscale that were saved as RGB?

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  Hello. I want to convert an image, acquired by webcam, grayscale in C, using myRIO. I have a webcam connected to myRIO, working on simple image acquisition, but I can't find a way to convert the image to grayscale. I get no error to the building or a run Configuration.

  It's the image is written in the file: (black)

  

  The code is here:

  
  
  
  
  #include "MyRio.h".
  
  
  
  
  #define CAM_NAME    'cam1 '.
  
  #define CAPTURED_IMAGE_PATH     ".» "/ capturedImage4.png".
  #define WINDOW_NUMBER    15    / / number of Image display window
  
  #define IMAQDX_ERROR_MESSAGE_LENGTH    256
  bool Log_Vision_Error (int valeurerreur);
  
  bool Log_Imaqdx_Error (IMAQdxError valeurerreur);
  int main (int argc, char * argv)
  
  {
  
  #if 1
  
      Status of NiFpga_Status;
  printf ("\n + ImageAcquisitionAndDisplayExample \n");
  Image * captureImage = NULL;
  
      	Image * processedImage;
  Session IMAQdxSession = 0;
  
      /*
  
       * Open the myRIO NiFpga Session.
  
       * This function MUST be called before all other functions. After this call
  
       * is complete the myRIO target will be ready to be used.
  
       */
  
      status = MyRio_Open();
  
      If (MyRio_IsNotSuccess (status))
  
      {
  
          return the situation;
  
      }
  Create the Image buffer
  
      	captureImage = imaqCreateImage (IMAQ_IMAGE_HSL, 0);
  
      	processedImage = imaqCreateImage (IMAQ_IMAGE_HSL, 0);
  
      	imaqSetImageSize (processedImage, 640, 480);
  Log on to the selected camera
  
      	If (Log_Imaqdx_Error (IMAQdxOpenCamera (CAM_NAME, IMAQdxCameraControlModeController, & session)))
  
      		Goto cleanup;
  Acquire an image
  
      	If (Log_Imaqdx_Error (IMAQdxSnap (session, captureImage)))
  
      		Goto cleanup;
  Process the image Captured here.
  
      	Grayscale
  If (Log_Imaqdx_Error (imaqExtractColorPlanes (captureImage, 1, NULL, NULL, processedImage)))
  
      	    		Goto cleanup;
  Write the image captured in the file
  
      	Log_Vision_Error (imaqWriteVisionFile (processedImage, CAPTURED_IMAGE_PATH, NULL));
  cleaning:
  
      	Log out of camera
  
      	IMAQdxCloseCamera (session);
  Have the image
  
      	imaqDispose (captureImage);
  
      	imaqDispose (processedImage);
  printf ("\n--ImageAcquisitionAndDisplayExample \n");
  
      	return 0;
  status = MyRio_Close();
  
  #endif
  
  }
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      {
  
      	If {(valeurerreur)
  
      		errorText tank [IMAQDX_ERROR_MESSAGE_LENGTH];
  
      		IMAQdxGetErrorString (valeurerreur, errorText, IMAQDX_ERROR_MESSAGE_LENGTH);
  
      		printf ("%s \n", errorText);
  
      		Returns true;
  
      	}
  
      	Returns false;
  
      }
  Print the VISION Error Message
  
      bool Log_Vision_Error (int valeurerreur)
  
      {
  
      	If ((valeurerreur! = TRUE) & (imaqGetLastError()! = ERR_SUCCESS)) {}
  
      		char * tempErrorText = imaqGetErrorText (imaqGetLastError ());
  
      		printf ("%s \n", tempErrorText);
  
      		imaqDispose (tempErrorText);
  
      		Returns true;
  
      	}
  
      	Returns false;
  
      }

  BoKnows wrote:

  Does not include the LabVIEW code you posted anything to send the image to a file.  I'm curious to know if we run out of questions at this point.  If we comment out code to convert grayscale, writing original image to the file properly or you didn't post in events where you say it works?

  I guess that LabVIEW code, you have published work to complete the task.  It's a little different from what I posted.  But I am not too concerned about that as long as things are working.

  The code works now. The problem is there:

  If (Log_Imaqdx_Error(imaqExtractColorPlanes (captureImage, 1, NULL, NULL, processedImage)))
  
  

  Instead of Log_Imaqdx_Error, it must be Log_Vision_Error.

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