Does anyone know how I turn negatives into a positive on Aperture please?  I have scanned  a bunch of negs and want ot make a contact sheet. Would really appreciate some clues on where to start.  Thanks

does anyone know how I turn negatives into a positive on Aperture please?  I have scanned  a bunch of negs and want ot make a contact sheet. Would really appreciate some clues on where to start.  Thanks

Yeah, it's simple. You scan your images singly, then import them. Then, one by one adjust them. Under the adjustment brick, pull up the CURVES tool. It is one of dozens available from the pulldown menu on the left side.
So, with your image in view, you click on the adjustment tool, select CURVES (which will be at the bottom of a few other adjustment sliders such as EXPOSURE) under the Histogram and then grab the bottom of the right hand curve and swing it all the way to the left. Then grab the left hand curve and drag it all the way to the right.
The right curve represents highlights. The left curve represents shadows. Now the two are reversed. Your negative is now a positive. For added control, you can create mid-tone curves of your own and make finer adjustments. I haven't done this much so the experts might weigh in here with corrections and added advice.

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