imaqOverlayText() method isn't working for me

[turboPres]

I am programming in Visual C++ and having some trouble with imaqOverlayText(...).

The following code shows the overlay text with the imaqDisplayImage but it doesn't show up when I write the .png.

status = imaqOverlayText(imageOut, partCenter, "Hey There", &(IMAQ_RGB_RED), &options, NULL);

status = imaqDisplayImage(imageOut, 0, TRUE);

strcpy(filename, partName);

strcat(filename, "after.png");

//imaqWriteFile(imageOut, filename, &IMAQ_RGB_WHITE);

status = imaqWritePNGFile(imageOut, filename, 1000, &IMAQ_RGB_WHITE);

I have tried to change the output image to a .bmp or a .jpg, neither of those types show the overlay text either.

Is the overlay text hidden in some layer that doesn't write to disk?

[gregstoll]

turboPres -

You are correct - the overlays are stored separately from the image, since they are non-destructive.  To put the overlays on the image, use the imaqMergeOverlay() function - then they should show up when you save them to a .bmp or .jpg.

Greg Stoll
IMAQ R&D
National Instruments

[turboPres]

Thanx

[turboPres]

Greg,

I took a look around the library and help files for imaqMergeOverlay() function. It doesn't exist!?! Following are the overlay functions available to me.

Class	LabWindows/CVI Equivalent	Function Name
Overlay	Clear Overlay	imaqClearOverlay
Overlay	Copy Overlay	imaqCopyOverlay
Overlay	Overlay Arc	imaqOverlayArc
Overlay	Overlay Closed Contour	imaqOverlayClosedContour
Overlay	Overlay Line	imaqOverlayLine
Overlay	Overlay Metafile	imaqOverlayMetafile
Overlay	Overlay Open Contour	imaqOverlayOpenContour
Overlay	Overlay Oval	imaqOverlayOval
Overlay	Overlay Points	imaqOverlayPoints
Overlay	Overlay Rect	imaqOverlayRect
Overlay	Overlay ROI	imaqOverlayROI
Overlay	Overlay Text	imaqOverlayText

[turboPres]

Greg,

I am using May 2001 Edition. Part Number 370379A-01.

[gregstoll]

turboPres -

It looks like you're using IMAQ Vision 6.0 - imaqMergeOverlay() is only available in IMAQ Vision 7.1 (the current version).

Alternatively, you can use imaqDrawTextOnImage() to put text directly on the image - in this case, you wouldn't need the overlay.

Greg Stoll
IMAQ R&D
National Instruments

[turboPres]

It works

Thank you very much