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如何在 Xfce 中根据壁纸颜色设置背景颜色？

tag-icon • tag-icon linux debian colors desktop-customization xfce
如何在 Xfce 中根据壁纸颜色设置背景颜色？

我有一个文件夹，里面有数百张（可能数千张）图片，我用它来循环显示 Xfce 中的壁纸。唯一的问题是，当图片设置为“缩放”时，它们看起来最好，对于某些图片，这会产生“信箱”效果，即用纯色背景填充其余区域。

我的问题是，上述背景颜色是否可以随着图像动态变化，使其看起来不那么空洞并与图像相适应，例如有多少漫画观众喜欢麦克米克斯怎么做？如果您不明白我在说什么，简短的解释是：如果图像大部分是白色，我希望纯色背景颜色为白色；如果图像大部分是黑色，我希望纯色背景颜色为黑色；等等。

答案1

经过一番思考，我决定编写一个 Python 脚本（Python 3），使用我找到的一些信息来监控last-image这个方便的实用程序的变化xfconf-query这里（稍微修改一下，只获取边框像素）。

您需要安装（最好使用 pip）numpy 和 Pillow：

pip3 install Pillow pip3 install numpy

接下来，创建一个包含此脚本的 .py 文件；我将其命名为“change-bg-with-color.py”：

#!/usr/bin/python3
from PIL import Image
from subprocess import Popen, PIPE
import numpy as np
import os
import traceback

# Edit to point to your workspace
WORKSPACE = "/backdrop/screen0/monitor2/workspace0"

# Choose your flavor! Average...
def compute_average_image_color(img):
    width, height = img.size

    r_total = 0
    g_total = 0
    b_total = 0
    a_total = 0

    count = 0

    # Get top and bottom borders
    for y in [0,height-1]:
        for x in range(0, width):
            r, g, b, a = img.getpixel((x,y))
            r_total += r
            g_total += g
            b_total += b
            a_total += a
            count += 1

    # Get left and right borders
    for x in [0,width-1]:
        for y in range(0, height):
            r, g, b, a = img.getpixel((x,y))
            r_total += r
            g_total += g
            b_total += b
            a_total += a
            count += 1

    return (np.uint16(r_total/count * 65535.0/255.0), np.uint16(g_total/count * 65535.0/255.0), np.uint16(b_total/count * 65535.0/255.0), np.uint16(a_total/count * 65535.0/255.0))

# or Mode
def compute_mode_image_color(img):
    width, height = img.size

    pixel_bins = {}

    # Get top and bottom borders
    for y in [0,height-1]:
        for x in range(0, width):
            pixel = img.getpixel((x,y))

            if pixel in pixel_bins:
                pixel_bins[pixel] += 1
            else:
                pixel_bins[pixel] = 1

    # Get left and right borders
    for x in [0,width-1]:
        for y in range(0, height):
            pixel = img.getpixel((x,y))

            if pixel in pixel_bins:
                pixel_bins[pixel] += 1
            else:
                pixel_bins[pixel] = 1

    pixel = (255,255,255,255)
    mode = 0
    for p,m in pixel_bins.items():
        if m > mode:
            pixel = p

    return (np.uint16(pixel[0] * 65535.0/255.0), np.uint16(pixel[1] * 65535.0/255.0), np.uint16(pixel[2] * 65535.0/255.0), np.uint16(pixel[3] * 65535.0/255.0))

# Start the monitor for changes to last-image
process = Popen(["xfconf-query", "-c", "xfce4-desktop", "-p", os.path.join(WORKSPACE, "last-image"), "-m"], stdout=PIPE)
while True:
    try:
        # Get the initial BG image from the workspace
        p2 = Popen(["xfconf-query", "-c", "xfce4-desktop", "-p", os.path.join(WORKSPACE, "last-image")], stdout=PIPE)
        (filename, err) = p2.communicate()
        exit_code = p2.wait()

        # Next, open the image
        img = Image.open(filename.decode('utf-8').strip()).convert("RGBA")

        # Determine and set the color (CHOOSE YOUR FLAVOR HERE)
        color = compute_mode_image_color(img)
        p2 = Popen(["xfconf-query", "-c", "xfce4-desktop", "-p", os.path.join(WORKSPACE, "color1"), "-s", str(color[0]) , "-s", str(color[1]), "-s", str(color[2]), "-s", str(color[3])], stdout=PIPE)
        (output, err) = p2.communicate()
        p2.wait()

        # Wait for next line
        line = process.stdout.readline()
        if line == '' and process.poll() is not None:
            break
    except Exception as e:
        print(e)
        traceback.print_exc()
        pass

选择您的风格（平均或模式）。务必修改字段WORKSPACE以指向您的工作区。您通常可以通过查看 ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-desktop.xml 找到它（感谢 Dial！）

只需运行脚本，背景颜色就会立即改变。当然，您可以将其配置为在启动时运行，但为了简单起见，省略了这些细节。这对我来说很有效！

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