captureScreen retina display

Is there any way to capture screen in retina display with 640x960 resolution? When I use captureScreen function in iPhone 4, I can only get a 1280x1920 image.

my config.lua file..

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application =
{
        content =
        {
                width = 320,
                height = 480,
                scale = "Letterbox",
                fps = 30,
                antialias = true,
                imageSuffix =
                                {
                                        ["@2x"] = 2,
                                },
        },
}
views:1386 update:2011/10/2 9:44:12
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