#!/usr/bin/env python
# coding: utf-8

# # How to cut out Target Pixel Files from Kepler Superstamps or TESS FFIs?
# 
# You can use `lightkurve` to cut Target Pixel Files (TPFs) out of a series of standard astronomical images, such as [K2 Superstamp Mosaics](https://archive.stsci.edu/prepds/k2superstamp/) or TESS Full-Frame-Images (FFIs).
# This brief tutorial will demonstrate how!

# In[23]:


get_ipython().run_line_magic('matplotlib', 'inline')
from lightkurve import KeplerTargetPixelFile
from glob import glob
import numpy as np


# Let's assume you have downloaded a set [simulated TESS FFI images](http://archive.stsci.edu/tess/ete-6.html) to a local directory called `data`. `lightkurve` will assume that the files are given in *time order*. So we'll sort the filenames first:

# In[28]:


fnames = np.sort(glob('data/*.fits'))


# Now we use the `KeplerTargetPixelFile` class and its function `from_fits_images()` to create the new TPF. This will cut out around the position keyword. You can pass a pixel position in units of the original image or RA and Dec coordinates.

# In[29]:


tpf = KeplerTargetPixelFile.from_fits_images(images=fnames, 
                                             position=(197,210), 
                                             size=(5,5))


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tpf.plot()


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tpf.to_lightcurve().plot()