diff --git a/.gitignore b/.gitignore
index 67c09e1..dd3680b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,164 @@
 
 *.un~
 *.pyc
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
diff --git a/examples/image_file.py b/examples/image_file.py
index 66488f6..024d592 100755
--- a/examples/image_file.py
+++ b/examples/image_file.py
@@ -7,7 +7,7 @@
 import sys
 from pathlib import Path
 import argparse
-from sixel import converter
+from sixel import converter, is_term_sixel_capable
 
 
 def main():
@@ -25,4 +25,7 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    if is_term_sixel_capable():
+        main()
+    else:
+        raise EnvironmentError("Your current terminal emulator does not support SIXEL!")
diff --git a/sixel/__init__.py b/sixel/__init__.py
index 9dd47b2..9dac302 100644
--- a/sixel/__init__.py
+++ b/sixel/__init__.py
@@ -8,6 +8,8 @@
 import optparse
 import select
 import logging
+import termios
+import tty
 from io import StringIO
 
 from .cellsize import get_size
@@ -22,6 +24,21 @@ def _filenize(f):
         return StringIO(f.read())
     return f
 
+def is_term_sixel_capable():
+    """based on `printf "\\033[c"`; returns if the current terminal emulator is capable of SIXEL"""
+    # import sys, termios, tty
+    if os.getenv("TERM", '').strip().startswith("yaft"):
+        return True
+
+    print("\033[c", end="", flush=True)
+    fd = sys.stdin.fileno()
+    orig = termios.tcgetattr(fd)
+
+    try:
+        tty.setcbreak(fd)  # or tty.setraw(fd) if you prefer raw mode's behavior.
+        return '4' in sys.stdin.read(10)
+    finally:
+        termios.tcsetattr(fd, termios.TCSAFLUSH, orig)
 
 def main():
     parser = optparse.OptionParser()