Save image with palette information

Hello!

Currently, I acquire a grayscale image with a MANTA camera. Then I display this image in an image window (NI Vision) and I apply to this image a gradient palette.

I would like to save it WITH the palette as png file.But so far it is always saved as grayscale picture, without taking account of the previous palette.

Here is how I save the image :

FileSelectPopupEx(......, PathName);

imaqWriteFile(image, PathName, NULL);

I tried to write IMAQ_PALETTE_GRADIENT rather than NULL, but an error occurs because it is not a RGB Value array.

How can I manage to do that?

Best regards,

thomas1330