5 Steps to Get the Hubble Palette Script in Siril

Siril is a free and open-source astrophotography software that offers a wide range of features for processing and enhancing astronomical images. One of the most popular features is the ability to create Hubble Palette images, a stunning color combination that mimics the famous images taken by the Hubble Space Telescope. In this article, we will show you how to get the Hubble Palette script in Siril and use it to create your own beautiful space images. Also, this script can run on both Windows and Linux operating systems.

To get the Hubble Palette script, you first need to download it from the Siril website. Once you have downloaded the script, you need to save it to your computer. Then, open Siril and go to the “Scripts” menu. From there, select “Open Script” and browse to the location where you saved the Hubble Palette script. Once you have selected the script, click on the “Open” button to load it into Siril. After loading up the script, you will see new tabs added to your screen that give you all the options and settings to generate Hubble Palette images. You can find in-depth demonstrations of each feature and setting of the script on the script’s official page.

Now that you have the Hubble Palette script loaded into Siril, you can start using it to process your images. To do this, simply open the image you want to process in Siril. Once the image is open, go to the “Scripts” menu and select “Hubble Palette.” This will open the Hubble Palette script window. From here, you can adjust the various settings of the script to achieve the desired look for your image. Once you are satisfied with the results, click on the “Apply” button to process the image. After processing, you can save the image by going to the “File” menu and selecting “Save.” You will now have a beautiful Hubble Palette image that you can share with others.

Prerequisites

Before you can use the Hubble Palette Script in Siril, you’ll need to make sure you have the following prerequisites in place:

Software Requirements

You’ll need to have Siril version 1.0 or later installed on your computer. You can download Siril from the official website: https://siril.org/. If you have an older version of Siril, you can upgrade it by following the instructions provided on the Siril website.

In addition to Siril, you’ll also need to install the Hubble Palette Script itself. You can download the script from the following GitHub repository: https://github.com/rafael-fontes/Hubble-Palette-Siril. Once you’ve downloaded the script, you can install it in Siril by following the instructions provided in the README file.

Hardware Requirements

The hardware requirements for using the Hubble Palette Script in Siril are relatively modest. You’ll need a computer with a reasonably powerful CPU and GPU. The script can be used on both Windows and macOS computers.

The following table provides a summary of the hardware requirements for using the Hubble Palette Script in Siril:

Requirement	Minimum	Recommended
CPU	2 GHz dual-core	4 GHz quad-core or better
GPU	1 GB of VRAM	2 GB of VRAM or better
RAM	4 GB	8 GB or more
Storage space	1 GB	2 GB or more

Downloading Hubble Palette Script

To download the Hubble Palette script for Siril, follow these steps:

1. Open your preferred web browser and navigate to the Siril website (https://siril.org/).
2. Click on the “Downloads” tab in the top menu bar.
3. Scroll down to the “Scripts” section and click on the “Hubble Palette” link.
4. Save the script file (“hubble_palette.py”) to your computer.

Extracted Hubble Palette Script File

The Hubble Palette script consists of three main components:

Component	Description
`create_hubble_palette()`	Creates a new Hubble Palette image by combining the L_RGB, R_RGB, and G_RGB images.
`apply_hubble_palette()`	Applies the Hubble Palette to an existing image.
`save_hubble_palette()`	Saves the Hubble Palette image to a file.

The following code sample shows how to create a Hubble Palette image from scratch:

“`python
import siril

# Load the L_RGB, R_RGB, and G_RGB images
l_rgb = siril.Image.load(“L_RGB.fits”)
r_rgb = siril.Image.load(“R_RGB.fits”)
g_rgb = siril.Image.load(“G_RGB.fits”)

# Create a new Hubble Palette image
hubble_palette = create_hubble_palette(l_rgb, r_rgb, g_rgb)

# Save the Hubble Palette image
hubble_palette.save(“hubble_palette.fits”)
“`

Installing Hubble Palette Script

Siril is a free and open-source astronomy software program that can be used for image processing, astrophotography, and other astronomy-related tasks. One of the features of Siril is the ability to use scripts to automate tasks. Hubble Palette Script is a script that can be used to apply the Hubble Palette to images.

To install Hubble Palette Script, follow these steps:

1. Download the Hubble Palette Script.

The Hubble Palette Script can be downloaded from the Siril website.

2. Install the Hubble Palette Script.

To install the Hubble Palette Script, open Siril and go to the “Scripts” menu. Then, select “Install Script” and select the Hubble Palette Script file.

3. Use the Hubble Palette Script.

To use the Hubble Palette Script, open an image in Siril and go to the “Scripts” menu. Then, select “Apply Script” and select the Hubble Palette Script. The script will be applied to the image, and the Hubble Palette will be applied to the image.

Parameter	Value
Sigma Lower	1.5
Sigma Upper	3.0
Background Subtraction	True
Color Range	[0, 65535]

Creating a New Project

To kickstart your Hubble Palette adventure, you’ll need to create a fresh project in Siril. Here’s how to do it:
1. Launch Siril and click on “File” in the menu bar.
2. Select “New Project” from the drop-down menu.
3. In the “New Project” dialog box, enter a name for your project and choose a location to save it.

– A handy tip: Keep your project files organized by creating a dedicated folder for your Hubble Palette projects.

4. Configure project settings
– Image Format: TIFF is recommended for Hubble Palette processing.
– Output Directory: Select the location where you want your processed images to be saved.
– Background Extraction: Choose the Laplacian background extraction method and set the iterations to 5.

5. Click the “Create Project” button to create your new project.
6. Your project will now appear in the Siril workspace.

Loading an Image

To begin processing an image using the Hubble Palette script in Siril, you must first load the image into the software. Here’s how to do it:

Launch Siril and create a new project or open an existing one.
Click on the “File” menu and select “Open Image”.
Navigate to the location of your image file and select it. Supported image formats include FITS, FITSZ, XISF, and TIFF.
Click “Open” to import the image into Siril.
The loaded image will appear in the main image viewing area. You can now proceed with applying the Hubble Palette script to the image.

Tips for Loading Images:

If your image is large, you may need to adjust the Siril settings to optimize performance. Go to “Preferences” > “Performance” and adjust the “Memory Limit” and “Chunk Size” settings.
To load multiple images at once, hold down the “Ctrl” (Windows) or “Cmd” (Mac) key while selecting the image files. Then, click “Open” to import all the selected images into Siril.
If you encounter any issues loading an image, check the file format and ensure that the image is not corrupted. You can also try converting the image to a supported format using an image conversion tool.

Applying the Hubble Palette Script

To apply the Hubble Palette script in Siril, follow these detailed steps:

1. Install the Script

Download the Hubble Palette script from the Siril forums and place it in the Siril scripts folder (usually located in the Documents folder).

2. Open the Script

In Siril, go to File > Open Script and select the Hubble Palette script.

3. Set the Input Images

In the script window, select the three input images (red, green, and blue) that you want to combine.

4. Adjust the Parameters

Customize the script parameters to fine-tune the final image. The following parameters are available:

Parameter	Description
Sigma Lower	Lower threshold for image normalization
Sigma Upper	Upper threshold for image normalization
Scale Factor	Scales the final image
Gamma	Adjusts the contrast of the final image

5. Run the Script

Click the Run button to execute the script. The Hubble Palette image will be generated and displayed in the main Siril window.

6. Fine-Tune the Image

The Hubble Palette image may require further post-processing to enhance the details and adjust the colors. Here’s a detailed guide to fine-tuning the image:

Adjust the Levels: Use the Levels tool to adjust the brightness, contrast, and gamma of the image.
Apply a Curve Adjustment: Use the Curve Adjustment tool to refine the contrast and tone of the image.
Use the Saturation tool: Adjust the saturation to enhance or reduce the intensity of the colors.
Apply Sharpening: Use the Unsharp Mask filter to sharpen the details in the image.
Add Noise Reduction: Use a noise reduction filter to remove any unwanted noise from the image.

By carefully following these steps and fine-tuning the image, you can create stunning Hubble Palette images with enhanced details and vibrant colors.

Setting Script Parameters

The Hubble Palette script has a number of parameters that can be set to control its behavior. These parameters include:

Red Channel

This parameter specifies the wavelength of light that will be used to create the red channel of the Hubble Palette image. The default value is 656 nm.

Green Channel

This parameter specifies the wavelength of light that will be used to create the green channel of the Hubble Palette image. The default value is 502 nm.

Blue Channel

This parameter specifies the wavelength of light that will be used to create the blue channel of the Hubble Palette image. The default value is 486 nm.

Saturation

This parameter controls the saturation of the Hubble Palette image. The default value is 1.0.

Contrast

This parameter controls the contrast of the Hubble Palette image. The default value is 1.0.

Gamma

This parameter controls the gamma correction of the Hubble Palette image. The default value is 1.0.

Black Point

This parameter specifies the black point of the Hubble Palette image. The default value is 0.0.

White Point

This parameter specifies the white point of the Hubble Palette image. The default value is 1.0.

Customizing the Palette

The Hubble Palette script allows you to customize the colors used in the generated palette. To customize, simply click on the “Edit Palette” button in the script’s interface. This will open a dialog box where you can adjust the following settings:

Hue: The hue of the color.
Saturation: The saturation of the color.
Lightness: The lightness of the color.

You can also use the sliders to adjust the colors in real time. Once you are satisfied with your changes, click on the “Apply” button to save them.

Parameter	Description
Hue	The angle of the color on the color wheel.
Saturation	The intensity of the color.
Lightness	The brightness of the color.

Saving the Processed Image

When you are satisfied with the processed image, you can save it in a variety of formats. To do so, click on the “File” menu and select “Save As”. A dialog box will appear, allowing you to choose the file format, name, and location.

There are a number of different file formats available, each with its own advantages and disadvantages. The most common format is JPEG, which is a lossy format that compresses the image to reduce file size. JPEGs are good for web use and for sharing with others, but they are not ideal for archival purposes because the compression can degrade the image quality.

Another popular format is PNG, which is a lossless format that does not compress the image. PNGs are therefore larger in file size than JPEGs, but they maintain the full image quality. PNGs are a good choice for archival purposes and for use in print.

For the best possible image quality, you can save the image in TIFF format. TIFFs are lossless and uncompressed, so they maintain the full image quality. TIFFs are also supported by a wide range of software programs, making them a versatile format.

Additional Information

File Format	Advantages	Disadvantages
JPEG	Small file size, good for web use	Lossy compression, degrades image quality
PNG	Lossless compression, maintains image quality	Larger file size than JPEGs
TIFF	Lossless and uncompressed, best image quality	Large file size, not supported by all software programs

Once you have selected the file format, you can enter a name for the file and choose a location to save it. Click on the “Save” button to save the image.

Refining the Results

Once you have applied the Hubble Palette script to your image, you may want to refine the results to improve the contrast and saturation. Here are some additional steps you can take:

1. Adjust the levels: Use the Levels tool to adjust the black point, white point, and gamma of the image. This can help to enhance the contrast and bring out more detail in the image.

2. Increase the saturation: If you want to make the colors in the image more vibrant, you can increase the saturation using the Saturation tool. Be careful not to over-saturate the image, as this can make it look unnatural.

3. Use a curve adjustment: A curve adjustment allows you to fine-tune the tonal range of the image. You can use the curve to adjust the contrast, brightness, and color balance of the image.

4. Apply a sharpening filter: A sharpening filter can help to bring out the details in the image. Use a sharpening filter with a small radius and a low amount to avoid over-sharpening the image.

5. Save the image: Once you are satisfied with the results, save the image in a high-quality format such as TIFF or PNG.

Parameter	Description
Black point	The darkest point in the image.
White point	The lightest point in the image.
Gamma	The contrast of the image.

How to Get Hubble Palette Script in Siril

The Hubble Palette is a popular color palette used in astrophotography. It is named after the Hubble Space Telescope, which has captured many iconic images in this palette. The Hubble Palette consists of three colors: red, green, and blue. These colors are often assigned to different wavelengths of light, such as H-alpha, OIII, and SII.

To get the Hubble Palette script in Siril, you can follow these steps:

1. Open Siril.
2. Go to the “Scripts” menu.
3. Select “Install Script”.
4. In the “Script URL” field, enter the following URL: https://siril.org/files/scripts/hubble_palette.py
5. Click “Install”.

Once the script is installed, you can use it to create a Hubble Palette image. To do this, follow these steps:

1. Open the image you want to use.
2. Go to the “Scripts” menu.
3. Select “Hubble Palette”.
4. In the “Output Filename” field, enter the name of the file you want to save the image to.
5. Click “Run”.

The script will create a Hubble Palette image and save it to the specified file.