plt.画图去除白色边框

fig, ax1 = plt.subplots(1, 1)
ax1.imshow(pic, cmap=plt.cm.gray)
ax1.axis('off')
height, width = pic.shape
# 如果dpi=300，那么图像大小=height*width
fig.set_size_inches(width / 100.0, height / 100.0)
plt.gca().xaxis.set_major_locator(plt.NullLocator())
plt.gca().yaxis.set_major_locator(plt.NullLocator())
plt.subplots_adjust(top=1, bottom=0, left=0, right=1, hspace=0, wspace=0)


plt.savefig('pic.png')
plt.show()