Menu bar, top right-hand corner, click the icon that looks like a strip of movie film, then "Capture Screenshot". It will put a .jpg of the scene into a Screenshot folder within your TANE's UserData folder (I think it actually creates that Screenshots folder the first time you do it). It may take a few seconds. I'm not impressed at how slow TANE is to capture screenshots .
Open the screenshot in a graphics program like IrfanView, Paint.NET, Photoshop or whatever you have. Make it a black and white (i.e. greyscale) image by full desaturating the image. Your graphics program will probably have other filters or effects (e.g. sepia tone) that can be used to fake old photos. Depends on the program.
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