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我的目标是将图片大小加倍,然后将左半部分更改为灰度,然后更改右上半部分的绿色值和右下半部分的蓝色值。我在教科书中找到了灰度值,但我不确定这是否是我实际使用的值。而且我也不确定我是否使用 for 循环或只是使用不同的东西对这些不同的值进行编程

到目前为止,我的代码是:

 def crazyPic(newGreen,newBlue,pic,file):
      show(pic)
      newPic = makeEmptyPicture(getWidth(pic)*2,getHeight((pic)*2
           for x in range(width):
              for y in range(height):
                  for px in getPixel(pic,0,100):
                  nRed = getRed(px) * 0.299
                  nGreen = getGreen(px) * 0.587
                  nBlue = getBlue(px) * 0.114
                  luminance = nRed + nGreen + nBlue
                  setColor(px,makeColor(luminance,luminance,luminance)
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1 回答 1

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我不应该给出完整的答案,因为 JES 是为学生设计的应用程序,但我认为三个月后可以给出一个完整的工作示例,可以作为其他人的参考......

这应该接近您尝试做的事情:

注意:您对 x 和 y 进行简单双循环的方法是正确的。

def crazyPic(pic, newRed, newGreen, newBlue):

    w = getWidth(pic)
    h = getHeight(pic)
    new_w = w * 2
    new_h = h * 2
    newPic = makeEmptyPicture(w * 2, h * 2)

    for x in range(new_w):
      for y in range(new_h):
          new_px = getPixel(newPic, x, y)

          # Top-left: B&W
          if (x < w) and (y < h):
            px = getPixel(pic, x, y)
            nRed = getRed(px) * newRed #0.299
            nGreen = getGreen(px) * newGreen #0.587
            nBlue = getBlue(px) * newBlue #0.114
            luminance = nRed + nGreen + nBlue
            new_col = makeColor(luminance, luminance, luminance)

          # Top-right
          elif (y < h):
            px = getPixel(pic, x - w, y)
            nRed = getRed(px) * newRed
            new_col = makeColor(nRed, getGreen(px), getBlue(px))

          # Bottom-left
          elif (x < w):
            px = getPixel(pic, x, y - h)
            nGreen = getGreen(px) * newGreen
            new_col = makeColor(getGreen(px), nGreen, getBlue(px))

          # Bottom-right
          else:
            px = getPixel(pic, x - w, y - h)
            nBlue = getBlue(px) * newBlue
            new_col = makeColor(getGreen(px), getBlue(px), nBlue)

          setColor(new_px, new_col)

    return newPic

file = pickAFile()
picture = makePicture(file)
#picture = crazyPic(picture, 0.299, 0.587, 0.114)
# Here, with my favorite r, g, b weights
picture = crazyPic(picture, 0.21, 0.71, 0.07)

writePictureTo(picture, "/home/quartered.jpg")

show(picture)


输出(Antoni Tapies绘画):


在此处输入图像描述......从......在此处输入图像描述


这是关于grayscale的更详细的线程


于 2013-06-29T08:01:53.113 回答