WPF graphics export to image problem

My problem is that I created a new custom personalized using the chart wpf OR as a base. The control includes mainly the chart, its axis and legends on a grid. To allow the legend be moved, I put it in a grid of the child. My problem is that he was trying to export as an image control, I use the code below (similar to wpf graphical image export):

Rect bounds = LayoutInformation.GetLayoutSlot(MainGrid);
var bitmap = new RenderTargetBitmap((int)bounds.Width + 1, (int)bounds.Height + 1, 96, 96, PixelFormats.Default);
bitmap.Render(MainGrid);

My problem is the axes and the edges of the image exported to the Clipboard is dark as shown below. Is saved in the image, the edges are quite transparent but better (not visible in the photos app but visible in the paint). My question is why is this behavior and how can it be avoided?

Thank you.

The problem is the default color of the grid or niGraph in WPF is transparent. I simply changed color or image now saved correctly.

Tags: NI Software

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