Seni Sulam dan Kreativitas - Panduan Membuat Mozaik dengan Photoshop
Creating an Astrophotography Mosaic
I have been spending a lot of time photographing the night sky towards the core of the Milky Way. My 80mm refractor has a focal length of 480mm, which magnifies many deep-sky objects in the area of Sagittarius .
The Lagoon Nebula and the Trifid Nebula lie very close together in the night sky, as far as emission nebulae go. With the right camera sensor, and a wide-field imaging refractor (such as the Radian Raptor 61 ), you should be able to fit both objects within the same field-of-view.
When the photo below was taken, my framing was a little off. I could have fit both objects in a single image frame with my Canon EOS 60Da DSLR camera with the right orientation.
I now know the importance of framing the objects in my field, especially when planning a mosaic . Creating a mosaic is a great way to photograph a large area of the night sky in detail.
Large deep-sky objects such as the Heart and Soul Nebulae are often captured using the mosaic method.
Step 1: Prepare the Mosaic Images
To create the mosaic, we’re going to need a bunch of photos. How many depends on the size of the mosaic/how you want your effect to look. The main thing is to choose a square number so you can create a pattern with the same number of rows across as it is tall.
For example, choose 49 photos for a 7 x 7 or 100 for a 10 x 10.
Also, if you want your individual images to display as squares, you’ll need to crop the images beforehand. You can do this in Photoshop (check out how to use the crop tool here) but this will be quite time-consuming if you’re working with a lot of photos.
I used the batch features in Lightroom to quickly crop mine. You can also use any photo editor that has these capabilities or you can find a free online tool to do the job.
Now, we need to get all the images into the same project in Photoshop. We could painstakingly do this by spending all day placing each photo. Or we can let Photoshop do the heavy lifting and have it done in a matter of seconds.
Assuming you want to go with the second option, here’s how to do it.
Moving down, let’s set up the grid. In the Units box, you can choose how you would like to measure your images. I’m going to use inches and set the width and height to 2. This will create square boxes for our images. If you want a different aspect ratio, this is where you put it.
Make sure the Flatten All Layers box is not checked. This will put each image on its own layer so you can modify its positioning later if needed. Make sure the Mode is set to RGB Color and the Bit Depth is 8-bit.
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