Saving active object frame to file

Hi all,

I want to implement the possibility to batch the save of active object frames to files (with a metadata file for image properties).

I managed to get code working but for some images, the images seem to loose quality or to be aliased although they should not be.

WORD imageNumber = (WORD)adPtr->adFrame[nFrame];
if (LockImageSurface(pObj->roHo.hoAdRunHeader->rhIdAppli, imageNumber, sprite))
{
		CImageFilterMgr* pImgMgr = rhPtr->rh4.rh4Mv->mvImgFilterMgr;
		bool res = ExportImage(pImgMgr, (fullName+".png").c_str(), &sprite, FILTERID_PNG);
}

If I use the save image button in the image editor of the active object, it works without problem.

Did I miss something?

with extension:
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with image editor:
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Merci Yves,

I changed the property to Direct3D9 and it worked as expected. I did not really need "pre multiplied alpha" and DX11 so it is OK for me. It won't be as generic as it can be but it is good enough for me.