需求
在熱圖邊畫出colorbar，並設置一些參數使得colorbar美觀。
然後保存圖像。
代碼:
def save_jet_figure(image, filename):
''' save jet colormap figure using matplotlib
Args:
---
image: ndarray of (width, height)
input image in gray scale.
filename: str
save filename
Returns:
---
None
Example:
---
from skimage.io import imread
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1 import make_axes_locatable
img = imread('./test.png')
img = img[:, :, 0]
save_jet_figure(img, './result.png')
plt.show()
'''
# show image
fig = plt.figure(tight_layout=True)
ax = fig.add_subplot(111)
im = ax.imshow(image, 'jet')
ax.axis('off')
# colorbar
divider = make_axes_locatable(ax)
cax = divider.append_axes('right', size='2%', pad=0.04)
cbar = plt.colorbar(im,
cax=cax,
extend='both',
extendrect=True,
ticks=[0.0, 0.5, 1.0],
)
cbar.outline.set_visible(False)
cbar.ax.tick_params(labelsize=8,
width=0,
length=0,
pad=1,)
# save image
fig.savefig(filename,
bbox_inches='tight',
pad_inches=0,
transparent=True,
dpi=300)
