Save image with same resolution without border etc. using matplotlib #python #matplotlib

example.py

dpi = 80

# What size does the figure need to be in inches to fit the image?
figsize = width / float(dpi), height / float(dpi)

# Create a figure of the right size with one axes that takes up the full figure
fig = plt.figure(figsize=figsize)
ax = fig.add_axes([0, 0, 1, 1])
ax.set_aspect('equal', adjustable='box')

# Hide spines, ticks, etc.
ax.axis('off')

# Display the image.
ax.imshow(img)

# Annotate something etc.
# ...

fig.savefig('out.png', dpi=dpi)