Python + opencv create simple gradient

 First, determine the initial color and end color of the gradient
This paper selects the initial color (10,250,25) Stop color (255,92,0), Can be found in ps View in , As shown in the figure below ：
First create a matrix ,500*500
From the initial color to the end color is the gradient process , Each point corresponds to RGB Values are gradient process values .
As shown in the picture , Each row rgb equally , Each column rgb The gradient
about opencv Description of color in ：
arr[x,y,B]=XX
arr[x,y,G]=XX
arr[x,y,R]=XX
Then you can write the following python sentence

import cv2
import numpy
arr=numpy.ones((500,500,3),dtype=numpy.uint8)
for r in range(500):
for g in range(500):
arr[r, :, 0] = 10 + r / 500 * 230
arr[r, :, 1] = 250 - g / 500 *160
arr[r, :, 2] = 25- g / 500 * 25
img = cv2.cvtColor(arr,cv2.COLOR_BGR2RGB )
cv2.resize(img,(500,500))
cv2.imshow("ceshi",img)
key=cv2.waitKey(0)
if key==27: # Press esc Key time , Close all windows
print(key)
cv2.imwrite("./Gradient.jpg",img)# Save the picture
cv2.destroyAllWindows()
cv2.destroyAllWindows()

  The result is as follows ：