This means you have to boost the signal, which you can do by collecting more photons with longer exposures from the celestial object in the image, as Astro Pix explains. When you take pictures of the sky, you want to make the celestial objects brighter and clearer and separate them from the background of sky, and for this you need a good signal-to-noise ratio. It also improves the signal-to-noise ratio of images. Image stacking prevents that graininess in your night sky images, helping to create smoother and more appealing pictures. This helps to reduce noise and make the images look much better than they would have in their original, individual form. Image stacking refers to taking many shots of the same image and then blending them together on your computer. It’s actually one of the most important things you should do if you’re taking pictures of the night sky. You might’ve heard people in astrophotography circles talk about stacking images.
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