negate()函數是Python Wand ImageMagick庫中的內置函數,用於否定參考圖像中的顏色。
用法:
negate(grayscale, channel)
參數:該函數接受上麵提到的和下麵定義的兩個參數:
- grayscale:這是一個布爾參數,用於存儲狀態以否定圖像中的灰度像素。
- channel:此參數將通道類型存儲為‘green’, ‘red’,‘yellow’等。
返回值:此函數返回Wand ImageMagick對象。
原始圖片:

範例1:

範例1:
# Import library from Image
from wand.image import Image
# Import the image
with Image(filename ='../geeksforgeeks.png') as image:
# Clone the image in order to process
with image.clone() as negate:
# Invoke negate function with Channel "green"
negate.negate(True, "green")
# Save the image
negate.save(filename ='negate1.jpg')
輸出:
範例2:
# 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 circlw 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)
# Invoke negate function with cahnnel "yellow"
pic.negate(False, "yellow")
# Save the image
pic.save(filename ='negate2.jpg')
輸出:
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注:本文由純淨天空篩選整理自sarthak_ishu11大神的英文原創作品 Wand negate() function – Python。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。