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@lx-frontend/img-compress

v1.0.2

Published

一个用来操作图片和获取图片信息的工具库。

Downloads

4

Readme

@lx-frontend/img-compress

一个用来操作图片和获取图片信息的工具库。

安装

pnpm i -D @lx-frontend/img-compress

使用

导入函数并调用

const {
  getImgsUnderFloderNeedCompress,
  findAllImgsNeedMoveToLocal,
  getPngShouldTransferToJpg
} = require('@lx-frontend/img-compress')

getImgsUnderFloderNeedCompress(/* 文件夹路径 */)
// ...

| 函数 | 功能 | | ---- | ---- | | compressImage | 压缩单张图片 | | getImgsUnderFloderNeedCompress | 获取文件夹下需要压缩的图片 | | isImgNeedCompress | 判断图片是否需要压缩 | | compressImagesUnderFloderIfNeeded | 找到文件夹下可以压缩的图片,压缩并输出到目标文件夹 | | getAllImgInfoUnderFloderByExt | 获取文件夹下所有以参数ext为后缀名的图片,如'.png' | | isNeedMoveToLocal | 判断图片是否需要作为本地图片使用 | | findAllImgsNeedMoveToLocal | 获取文件夹下所有应该作为本地图片使用的图片列表 | | isPngNeedTransferToJpg | 判断png图盘是否需要转换成jpg | | getPngShouldTransferToJpg | 获取文件夹下所有需要转换成jpg的png图片 | | transferPngToJpg | 将png图片转换成jpg,并输出到目标路径 | | transferAllPngToJpgUnderFloderIfNeeded | 将文件夹下所有需要转换成jpg的png图片转换成jpg,并输出到目标文件夹 |

命令方式使用

| 命令 | 功能 | | ---- | ---- | | imgX | 显示所有可用命令 | | isImgNeedCompress | 检查图片是否需要压缩 | | getAllImgNeedCompressUnderFloder | 获取文件夹下所有需要压缩的图片 | | compressImgUnderFloderIfNeeded | 找到文件夹下所有需要压缩的图片,压缩后,输出到目标文件夹 | | compressImg | 压缩单张图片 | | isNeedMoveToLocal | 检查图片是否需要移动到本地 | | getAllNeedMoveToLocal | 获取文件夹下所有需要移动到本地的图片 | | isPngNeedTransToJpg | 检查png图片是否需要转换为jpg | | getAllPngShouldTransferToJpg | 获取指定文件夹下所有需要转换为jpg的png图片 | | transferPngToJpg | 将png图片转换为jpg | | transferAllPngToJpgUnderFloderIfNeeded | 找到所有需要转换为jpg的png图片,转换后,输出到目标文件夹 |

举例:imgX getAllImgNeedCompressUnderFloder path/to/src 打印path/to/src下所有需要压缩的图片路径

具体使用方式,请使用imgX [命令名] -h查看

imgX可以打印所有可以使用的命令和相关信息

特别说明

Q: 工具库压缩质量选取的是多少? A: 该库采用的sharp进行图片操作,压缩质量默认85。函数提供了修改这个值的参数,但是命令行没有提供修改的接口。

Q: 工具库是如何判断图片是否需要压缩? A: 工具库首先尝试对目标图片进行了压缩,然后获取压缩后的图片大小和压缩之前的大小对比,如果图片体积缩小了30%以上,可以认为图片需要压缩。

Q: 对压缩过的图片再进行是否需要压缩判断,是否会二次压缩? A: 不会,经过压缩的图片,再次压缩已经没有多少优化空间了,即使降低压缩质量,也只能获得微小的体积优化,远远不及30%。

Q: 如何判断图片是否应该放在远程还是本地? A: 默认图片如果小于1KB,放在本地,大于1KB,可按需要放在本地或者远程。暂时没有提供修改这个阈值的入口。

Q: 如何判断png是否需要转换为jpg? A: sharp可以遍历图片的所有像素点,如果所有的像素点都是不透明的,则可以判断可以转为jpg。