Pgmagick contrast() 方法 – Python

contrast()函数是 Pgmagick 库中的一个内置函数，用于增强或降低图像的对比度。该函数在成功时返回真值。

Syntax: 
 

Parameters: This function accepts a single parameter multiplier which is the factor by which the contrast of image should increase or decrease.
Return Value: This function returns the Pgmagick object with image added. 
 

输入图像：

示例 1：

Python3

contrast(multiplier)

Python3

from pgmagick import Image, DrawableCircle, DrawableText
from pgmagick import Geometry, Color
 
# draw the image of dimension 600 * 600
img = Image('input.png')
 
# invoke contrast() function
img.contrast(27)
 
# invoke write function along with filename
img.write('2_a.png')

输出：

示例 2：

Python3

# import library
from pgmagick import Image, DrawableCircle, DrawableText
from pgmagick import Geometry, Color
 
# Draw image of dimension 600 * 600 having background green
im = Image(Geometry(600, 600), Color("# 32CD32"))
 
# invoke DrawableCircle() function
circle = DrawableCircle(100, 100, 300, 20)
 
# invoke draw() function
im.draw(circle)
 
# set font size to 40px
im.fontPointsize(40)
 
# invoke DrawableText() function
text = DrawableText(250, 450, "GeeksForGeeks")
 
# invoke draw() function
im.draw(text)
 
# invoke contrast() function
im.contrast(40)
 
# invoke write function along with filename
im.write('1_b.png')

输出：