发布时间:2023-07-23 19:30
from PIL import Image
例:
from PIL import Image
import numpy as np
im = np.array(Image.open(\"C:/Users/sssss/.spyder-py3/123.jpg\"))
print(im.shape,im.dtype)
例:
from PIL import Image
import numpy as np
a = np.array(Image.open(\"C:/Users/sssss/.spyder-py3/123.jpg\"))
print(a.shape,a.dtype)
b = [255,255,255] -a
im = Image.fromarray(b.astype(\'uint8\'))
im.save(\"C:/Users/sssss/.spyder-py3/1234.jpg\")
将彩色照片变成灰度图片:
from PIL import Image
import numpy as np
a = np.array(Image.open(\"C:/Users/sssss/.spyder-py3/123.jpg\").convert(\'L\'))
b = 255 - a
im = Image.fromarray(b.astype(\'uint8\'))
im.save(\"C:/Users/sssss/.spyder-py3/1234.jpg\")
import matplotlib.pyplot as plt
例1:
import matplotlib.pyplot as plt
plt.plot([3,1,4,5,2])
plt.ylabel(\"grade\")
plt.savefig(\'test\',dpi=600) #PNG文件
plt.show()
例2:
plt.plot([0,2,4,6,8],[3,1,4,5,2])
plt.ylabel(\"grade\")
plt.axis([-1,10,0,6])
plt.show()
plt.plot(x,y,format_string,**kwargs)
注:当绘制多条曲线时,各条曲线的x不能省略
例:
import matplotlib.pyplot as plt
import numpy as np
a = np.arange(10)
plt.plot(a,a*1.5,\'go-\',a,a*2.5,\'rx\',a,a*3.5,\'*\',a,a*4.5,\'b-,\')
plt.show()
例1:
import matplotlib.pyplot as plt
import matplotlib
matplotlib.rcParams[\'font.family\']=\'SimHei\' #黑体
plt.plot([3,1,4,5,2])
plt.ylabel(\"纵轴(值)\")
plt.savefig(\'test\',dpi=600)
plt.show()
import numpy as np
import matplotlib.pyplot as plt
import matplotlib
matplotlib.rcParams[\'font.family\']=\'STSong\'
matplotlib.rcParams[\'font.size\']=20
a = np.arange(0.0,5.0,0.02)
plt.xlabel(\'横轴:时间\')
plt.ylabel(\'纵轴:振幅\')
plt.plot(a,np.cos(2*np.pi*a),\'r--\')
plt.show()
import numpy as np
import matplotlib.pyplot as plt
a = np.arange(0.0,5.0,0.02)
plt.xlabel(\'横轴:时间\',fontproperties=\'SimHei\',fontsize=20)
plt.ylabel(\'纵轴:振幅\',fontproperties=\'SimHei\',fontsize=20)
plt.plot(a,np.cos(2*np.pi*a),\'r--\')
plt.show()
plt.subplot2grid(GrindSpec,CurSpec,colspan=1,rowspan=1)
例:
import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec
gs = gridspec.GridSpec(3,3)
ax1 = plt.subplot(gs[0,:])
ax2 = plt.subplot(gs[1,:-1])
ax3 = plt.subplot(gs[1:,-1])
ax4 = plt.subplot(gs[2,0])
ax5 = plt.subplot(gs[2,1])