import holoviews as hv
from holoviews import opts
hv.extension('bokeh')

penguins = hv.RGB.load_image('../assets/penguins.png')
(penguins * hv.Bounds((-0.15, -0.4, 0.2, 0))).opts(
   opts.Bounds(color='orange', line_width=6))

penguins * penguins[-0.15:0.2, -0.4:0, 'G'] * hv.Bounds((-0.15, -0.4, 0.2, 0))