如何在 python 中使用魔杖创建图像

How to create an image with wand in python

我正在尝试创建一个 4 像素的图像:

1 个红色像素, 1个蓝色像素, 1像素绿色, 白色 1 像素

代码:

import wand.image

red = wand.image.Color('rgb(255,0,0)')
green = wand.image.Color('rgb(0,255,0)')
blue = wand.image.Color('rgb(0,0,255)')
white = wand.image.Color('rgb(255,255,255)')

myImage = wand.image.Image(width=2,height=2)

with wand.image.Image (myImage) as img:
    img[0][0] = red
    img[0][1] = blue
    img[1][0] = green
    img[1][1] = white
    img.save(filename='out.png')

但它只创建了一个透明的png。我究竟做错了什么?

Wand 的像素迭代器无法将颜色数据 "sync" 返回到 ImageMagick 的 "authentic" 像素数据流中。

您可以实现导入像素数据流,(类似的问题经常被问到)。

或使用wand.drawing.Drawing API.

from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color


with Drawing() as ctx:
    colors = ["RED", "GREEN", "BLUE", "WHITE"]
    for index, color_name in enumerate(colors):
        ctx.push()                         # Grow context stack
        ctx.fill_color = Color(color_name) # Allocated color
        ctx.point(index % 2, index / 2)    # Draw pixel
        ctx.pop()                          # Reduce context stack
    with Image(width=2, height=2, background=Color("NONE")) as img:
        ctx.draw(img)
        img.sample(100,100)
        img.save(filename="output.png")