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Image editor using Python and Pillow.

Project description

py-img-processor

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Image editor using Python and Pillow.

依赖Pillow开发的Python库,用于图像编辑处理。

1. 安装

pip install py-img-processor

依赖:

  • Python >= 3.9
  • Pillow >= 8.0.0

可查看版本变更记录 ChangeLog

2. 使用(Usage)

具体使用说明查看 readthedocs

2.1 运行配置

可以通过指定环境变量PY_SETTINGS_MODULE加载配置文件:

export PY_SETTINGS_MODULE=${your_project.settings_file.py}

支持的配置项有:

配置项 类型 说明 默认值
DEBUG bool 是否debug开发模式 False
PROCESSOR_MAX_FILE_SIZE int 处理原图的大小限制, 单位 MB 20
PROCESSOR_MAX_W_H int 处理图像,原图宽高像素限制 30000
PROCESSOR_MAX_PIXEL int width x height总像素3亿,处理前后的值都被此配置限制 300000000
PROCESSOR_DEFAULT_QUALITY int 图像处理后的默认质量 75
PROCESSOR_TEXT_FONT str 默认字体文件,默认从系统中寻找;也可以直接传递字体文件路径 Arial Unicode.ttf

注意PROCESSOR_TEXT_FONT 字体的设置是文字水印必要参数,需保证系统已安装该字体。默认值 Arial Unicode.ttf 是MacOS系统存在的字体,建议设置字体文件路径。

2.2 图像处理

测试图片 lenna-400x225.jpg (像素400x225)

处理函数

process_image_by_path(input_path, out_path, params)

参数说明:

  • input_path str,输入图像文件路径
  • out_path str, 输出图像保存路径
  • params str or json,图像处理参数,参数说明详见 Reference.md

图像处理参数为字符串

  • 斜线 / 隔开,区分不同的操作;
  • 逗号 , 隔开,区分操作中不同的参数;
  • 下划线 _ 隔开,key_value 的形式,区分参数的Key和Value;
  • value是复杂参数时,需要进行base64url_encode,是否需要encode查看文档参数详细说明;
from imgprocessor.utils import base64url_encode
from imgprocessor.processor import process_image_by_path

process_image_by_path(
    "docs/imgs/lenna-400x225.jpg",
    "/tmp/output.png",
    # 对图片缩放、裁剪、生成圆角、并转成png存储
    f"resize,s_200/crop,w_200,h_200,g_center/watermark,text_{base64url_encode('Hello 世界')},color_FFF,size_20/circle,r_10/format,png",
)

输出图像 (像素200x200):

图像处理参数为JSON

  • 只是形式不同,参数和字符串形式无本质区别;
  • formatqualityinterlace三个值在JSON第一层,直接按照key: value的形式设置;
  • 其他参数都放在 actions 数组中;
process_image_by_path(
    "docs/imgs/lenna-400x225.jpg",
    "/tmp/output.png",
    {
        "actions": [
            {"key": "resize", "s": 200},
            {"key": "crop", "w": 200, "h": 200, "g": "center"},
            # JSON形式参数, text无需encode
            {"key": "watermark", "text": "Hello 世界", "color": "FFF", "size": 20},
            {"key": "circle", "r": 10},
        ],
        "format": "png",
    },
)

该操作与上述字符串示例参数等效。

命令行

安装库后 有可执行命令 img-processor 可以使用,通过 img-processor -h 查看参数说明。

usage: img-processor [-h] [-V] -P PATH [--action ACTION [ACTION ...]] -O OUTPUT [--overwrite]

图像处理

optional arguments:
  -h, --help            show this help message and exit
  -V, --version         show program's version number and exit
  -P PATH, --path PATH  输入图像的文件路径/目录,若是目录则批量处理目录下所有图像
  --action ACTION [ACTION ...]
                        操作参数,可对同一个文件多组操作
  -O OUTPUT, --output OUTPUT
                        输出图像路径,多个图像或多个操作时请设置已存在的目录
  --overwrite           是否覆盖输出路径中已有文件

示例:

# 对单个图像进行多个操作,actions有2个参数,会输出2个图像文件
img-processor -P docs/imgs/lenna-400x225.jpg -O /tmp/ --action resize,s_200/format,webp resize,s_225/crop,w_225,h_225,g_center/circle/format,png --overwrite

注意:action参数仅支持字符串表达形式。

会输出2个图像文件:

/tmp/lenna-400x225-0.webp (像素355x200)

/tmp/lenna-400x225-1.png (像素225x225)

提取图像主色调

from imgprocessor.processor import extract_main_color

extract_main_color("docs/imgs/lenna-400x225.jpg")
# 输出: "905C4C"

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