Stitching together stacks of stars

- Previously, you saw me out in the cold…battling the elements, try...…yeah, okay, it wasn't that bad.…Anyway, I was out shootin' star trail pictures.…I was trying to get one of those images where,…or a couple of those images where…I've got streaks of stars in the sky,…and I was doing it using a method whereby…I was taking lots of images at shorter…shutter speeds, still very long, but shorter,…so that I could stack them together.…So, rather than shooting a single, 4-hour shot,…I was shooting a series of 30-second shots,…with the idea that they could be combined later.…

Now, I'm gonna show you how to combine them.…And I'm actually gonna show you how to combine…a couple of images because it turns out…the first one I shot didn't really work,…but I wanna show you that one because there's…something important that we can learn from it.…So, I've copied the images over from my camera.…I've got a whole bunch of JPEGs.…Now, I actually shot in RAW, and to speed things up,…I have converted those to JPEG.…I did that in Photoshop using the Image Processor,…