Finding the brightest pixel

How to find and overplot the location of the brightest pixel

import numpy as np
import astropy.units as u
import matplotlib.pyplot as plt

import sunpy.map
from sunpy.data.sample import AIA_171_IMAGE

We start with the sample data.

aia = sunpy.map.Map(AIA_171_IMAGE)

To find the brightest pixel, we find the maximum in the AIA image data then transform that pixel coordinate to a map coordinate.

pixel_pos = np.argwhere(aia.data == aia.data.max()) * u.pixel
hpc_max = aia.pixel_to_world(pixel_pos[:, 1], pixel_pos[:, 0])

Let’s now plot the results.

fig = plt.figure()
ax = plt.subplot(projection=aia)
aia.plot()
ax.plot_coord(hpc_max, 'wx', fillstyle='none', markersize=15)
# or you could also use
ax.plot(pixel_pos[:, 1], pixel_pos[:, 0], 'ro', fillstyle='none', markersize=15)
plt.show()
../../../_images/sphx_glr_brightness_pixel_location_001.png

Total running time of the script: ( 0 minutes 0.698 seconds)

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