Installation

BlendingToolKit (btk) uses GalSim to simulate galaxy images. The required python version for btk is python 3.9. The required packages for btk are:

• astropy

• galsim

• galcheat

• matplotlib

• numpy

• scikit-image

• scipy

• sep

• tqdm

and their specific versions are listed in the pyproject.toml under the [tool.poetry.dependencies] section.

Install GalSim

GalSim is a python module that has much of its implementation in C++ for improved computational efficiency. It can be installed with:

pip install galsim

However, you may have to install FFTW and Eigen manually. Refer to this for more details.

Install BTK

Once you installed galsim, you can install the latest released version of btk with pip:

pip install blending-toolkit==1.0.0b2

The version flag is necessary as the latest version is a pre-release. This command should install all other missing dependencies if necessary. You can then import the package as follows:

import btk
import btk.catalog

Scarlet

BTK includes the Scarlet deblender as one of its Deblender classes. This means that you can easily run the scarlet deblender on BTK blends.

First you need to install scarlet, this is not by default installed with BTK as scarlet is not in pypi. You can install scarlet by following the instructions here: https://pmelchior.github.io/scarlet/install.html.