Color image with Siril
If you have images taken with RGB or SHO filters, there are several ways to create a color image in Siril. Below we show a few examples. For more details, please refer to the official online tutorials.
For comprehensive and detailed information about Siril and RGB composition, please refer to:
https://siril.org/tutorials/rgb_composition/
If you do not have calibration frames (bias, darks, flats):
a) If you have just 3 frames (one per filter)
1. Open Siril
2. Go to Image Processing → RGB Compositing
3. A new window will open. For each filter, select the corresponding image on your computer by clicking the folder icon and choosing the appropriate file (e.g. red square for the Red filter or S filter image)
4. Close the previous window, then select RGB at the top of the image and select Linear → Histogram at the bottom. You should now see a color image.
b) If you have many frames
If, on the other hand, you have several images per filter, you’ll need to use what’s called a “script” to combine them. Siril already includes some automatic scripts, but those require calibration frames (darks, biases, and flats).
To process images without bias, dark, or flat frames, you need to download a specific script.
The script to download is called:
OSC_Preprocessing_WithoutDBF.ssf
You can find it here:
https://gitlab.com/free-astro/siril-scripts/-/tree/main/preprocessing?ref_type=heads
Then, you can follow this video tutorial starting from minute 2:50 (he downloads three files, but you only downloaded one):
https://www.youtube.com/watch?v=EvMZox2dlZA&t=6s
Once the script has finished running, you can set Linear → Histogram at the bottom of the image in order to see color image.
There are many tutorials online on how to enhance and adjust your images. It’s very helpful to explore them on your own.
Since you only have a few images, the final result may not look perfect (especially the colors), but it’s great practice to get familiar with the process.
If you have the calibration frames (bias, darks, biases)
Just follow this very clear and easy-to-follow tutorial:
https://siril.org/tutorials/first-steps/
