魔杖水印（）函数- Python

watermark()函数是Python Wand ImageMagick 库中的一个内置函数，用于透明化提供的图像并将其放置在当前图像上，图像的左上角位于当前图像顶部的坐标左侧。

Syntax:

Parameters: This function accepts four parameters as mentioned above and defined below:

Image: This parameter stores the image which is ti be placed.
Transparency: This parameter stores the value of the amount of transparency. It ranges from 0.0 to 1.0.
Left: This parameter stores the value of the x-coordinate where image will be placed.
Top: This parameter stores the value of the the y-coordinate where image will be placed.

Return Value: This function returns the Wand ImageMagick object.

编程需要懂一点英语

原图：

水印图片：

示例 1：

Python3

watermark(image, transparency, left, top)

Python3

# Import library from Image
from wand.image import Image
 
# Import the image
with Image(filename ='../geeksforgeeks.png') as image:
    # Import the watermark image
    with Image(filename ='wave1.jpg') as water:
        # Clone the image in order to process
        with image.clone() as watermark:
            # Invoke watermark function with watermark image, transparency as 0.5
            # left as 10 and top as 20
            watermark.watermark(water, 0.5, 10, 20)
                # Save the image
            watermark.save(filename ='watermark1.jpg')

输出：

示例 2：

Python3

# Import libraries from the wand 
from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color
 
with Drawing() as draw:
    # Set Stroke color the circle to black
    draw.stroke_color = Color('black')
    # Set Width of the circle to 2
    draw.stroke_width = 1
    # Set the fill color to 'White (# FFFFFF)'
    draw.fill_color = Color('white')
 
    # Invoke Circle function with center at 50, 50 and radius 25
    draw.circle((200, 200), # Center point
                (100, 100)) # Perimeter point
    # Set the font style
    draw.font = '../Helvetica.ttf'
    # Set the font size
    draw.font_size = 30
     
    with Image(width = 400, height = 400, background = Color('# 45ff33')) as pic:
        # Set the text and its location
        draw.text(int(pic.width / 3), int(pic.height / 2), 'GeeksForGeeks !')
        # Draw the picture
        draw(pic)
        # Import the watermark image
        with Image(filename ='wave1.jpg') as water:
            # Invoke watermark function with watermark image, transparency as 0.5
            # left as 10 and top as 20
            pic.watermark(water, 0.5, 10, 20)
            # Save the image
            pic.save(filename ='watermark2.jpg')

输出：