我如何用魔杖绘制颜色和半透明的界线

发布于 2025-02-07 05:47:07 字数 633 浏览 1 评论 0原文

我使用诸如打击之类的代码在我的图片上绘制半透明的黑色框架，边框宽度5像素。

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

# ... init image

with (Drawing() as draw):
    draw.stroke_width = 5 
    draw.fill_color = Color('transparent')
    draw.stroke_color = Color('rgb(0, 0, 0, 0.5)')
    draw.rectangle(left=frame_offset, top=frame_offset, 
        right=w-frame_offset, bottom=h-frame_offset)

但是颜色（'rgb（0，0，0，0.5）'）给出了固体黑色边框，而不是预期的半透明。

我在没有成功的情况下尝试了颜色构造器中的alpha设置的某些值，并且在文档中没有关于它的描述。谁能给出一些建议？

原文

I use the code like blow to draw a semi-transparent black frame on my picture, border width 5 pixels.

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

# ... init image

with (Drawing() as draw):
    draw.stroke_width = 5 
    draw.fill_color = Color('transparent')
    draw.stroke_color = Color('rgb(0, 0, 0, 0.5)')
    draw.rectangle(left=frame_offset, top=frame_offset, 
        right=w-frame_offset, bottom=h-frame_offset)

But the Color('rgb(0, 0, 0, 0.5)') gives a solid black border, not semi-transparent as expected.

I had tried some value of the alpha setting in color constructor without successful, and in document of wand there is no description about it. Can anyone give some advice?

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弱骨蛰伏 2025-02-14 05:47:07

rgb颜色定义后，您缺少a。只需将draws.stroke_color属性更新为rgba（0，0，0，0，0.5）。

with Image(filename='logo:') as img:
    with Drawing() as ctx:
        ctx.fill_color = 'transparent'
        ctx.stroke_width = 5
        ctx.stroke_color = 'rgba(0, 0, 0, 0.5)'
        ctx.rectangle(left=60, top=80, width=520, height=340)
        ctx(img)
    img.save(filename='output.png')

You're missing the a after rgb color definition. Just update the Drawing.stroke_color property to rgba(0, 0, 0, 0.5).

with Image(filename='logo:') as img:
    with Drawing() as ctx:
        ctx.fill_color = 'transparent'
        ctx.stroke_width = 5
        ctx.stroke_color = 'rgba(0, 0, 0, 0.5)'
        ctx.rectangle(left=60, top=80, width=520, height=340)
        ctx(img)
    img.save(filename='output.png')