Python-3，我的程序没有显示负面的图像。

Question

因此，我需要按照我的教科书中的功能，使一个图像负，并显示负面的形象。我试着修改了一些东西，以复制之前的函数，看看这是否会改变，比如输入我想要的负面的图像。它编译并运行良好，没有错误，只是没有显示我的负面形象，所以我不知道是什么问题。

from cImage import *
def negativePixel(oldPixel):
    newRed = 255 - oldPixel.getRed()
    newGreen = 255 - oldPixel.getGreen()
    newBlue = 255 - oldPixel.getBlue()
    newPixel = Pixel(newRed, newGreen, newBlue)
    return newPixel`



def MakeNegative(imageFile):
    oldImage = FileImage(imageFile)
    width = oldImage.getWidth()
    height = oldImage.getHeight()

    myImageWindow = ImageWin("Negative Image", width * 2, height)
    oldImage.draw(myImageWindow)
    newIn = EmptyImage(width, height)

    for row in range(height):
        for col in range(width):
            oldPixel = oldImage.getPixel(col, row)
            newPixel = negativePixel(oldPixel)
            newIn.setPixel(col, row, newPixel)
newIn.setPosition(width + 1, 0)
newIn.draw(myImageWindow)
myImageWindow.exitOnClick()

Answer 1

您的代码不是为我编译或运行的；我修复了一些东西--缩进、import image (不是cImage)、不调用MakeNegative()、参数无序等等。我在Ubuntu18.04，Python3.6.9，cImage-2.0.2，枕头-7.2.0上。

from image import *
def negativePixel(oldPixel):
    newRed = 255 - oldPixel.getRed()
    newGreen = 255 - oldPixel.getGreen()
    newBlue = 255 - oldPixel.getBlue()
    newPixel = Pixel(newRed, newGreen, newBlue)
    return newPixel



def MakeNegative(imageFile):
    oldImage = FileImage(imageFile)
    width = oldImage.getWidth()
    height = oldImage.getHeight()

    myImageWindow = ImageWin(width * 2, height, "Negative Image")
    oldImage.draw(myImageWindow)
    newIn = EmptyImage(width, height)

    for row in range(height):
        for col in range(width):
            oldPixel = oldImage.getPixel(col, row)
            newPixel = negativePixel(oldPixel)
            newIn.setPixel(col, row, newPixel)

    newIn.setPosition(width + 1, 0)
    newIn.draw(myImageWindow)
    myImageWindow.exitOnClick()

MakeNegative('Lenna_test_image.png')

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