image - 如何使用 PNGQUANT 执行批量 PNG 压缩并将所有转换后的图像及其源名称保存到另一个文件夹？

Question

我想压缩目录中存在的所有 png 图像文件，并使用 pngquant 将所有这些转换/压缩的图像文件以其原始图像名称保存到不同的文件夹中。 :

批量压缩语法:

pngquant.exe --quality=40-55 images\*.png

它压缩images目录下的所有PNG图片文件，并将压缩后的文件另存为同一目录下的新文件，并在原文件名后附加-fs8，例如

arrow.png
arrow-fs8.png

arrow.png 是源文件，arrow-fs8.png 是输出文件。

我想将所有转换后的文件以其原始名称保存在一个单独的文件夹中。

有谁知道如何用 pngquant.exe 做到这一点？ ？

pngquant 使用选项 -h 运行时的帮助输出:

pngquant, 2.5.2 (October 2015), by Greg Roelofs, Kornel Lesinski.
   Compiled without support for color profiles. Using libpng 1.6.18.

usage:  pngquant [options] [ncolors] -- pngfile [pngfile ...]
        pngquant [options] [ncolors] - >stdout <stdin

options:
  --force           overwrite existing output files (synonym: -f)
  --skip-if-larger  only save converted files if they're smaller than original
  --output file     destination file path to use instead of --ext (synonym: -o)
  --ext new.png     set custom suffix/extension for output filenames
  --quality min-max don't save below min, use fewer colors below max (0-100)
  --speed N         speed/quality trade-off. 1=slow, 3=default, 11=fast & rough
  --nofs            disable Floyd-Steinberg dithering
  --posterize N     output lower-precision color (e.g. for ARGB4444 output)
  --verbose         print status messages (synonym: -v)

Quantizes one or more 32-bit RGBA PNGs to 8-bit (or smaller) RGBA-palette.
The output filename is the same as the input name except that
it ends in "-fs8.png", "-or8.png" or your custom extension (unless the
input is stdin, in which case the quantized image will go to stdout).
The default behavior if the output file exists is to skip the conversion;
use --force to overwrite. See man page for full list of options.

Answer 1

这是带有附加功能的任务的批处理代码。

@echo off
setlocal

rem It is expected that pngquant.exe is in same directory as the
rem batch file and %~dp0 returns this path ending with a backslash.
set "ToolPath=%~dp0"

rem Use as source directory either the first specified parameter
rem on calling this batch file or the current working directory.
set "SourceFolder=%~f1"
if "%SourceFolder%" == "" set "SourceFolder=%CD%"

rem Replace all slashes by backslashes.
set "SourceFolder=%SourceFolder:/=\%"
rem Remove last character if it is a backslash.
if  "%SourceFolder:~-1%" == "\" set "SourceFolder=%SourceFolder:~0,-1%"

rem Use as output directory either the second specified parameter
rem on calling this batch file or the current working directory.
set "OutputFolder=%~f2"
if "%OutputFolder%" == "" set "OutputFolder=%CD%"
set "OutputFolder=%OutputFolder:/=\%"
if  "%OutputFolder:~-1%" == "\" set "OutputFolder=%OutputFolder:~0,-1%"

rem Set source directory as current directory. The source directory
rem can be also specified with an UNC path which is the reason why
rem command PUSHD is used and not command CD.
pushd "%SourceFolder%"

rem Either optimize all PNG files in source directory with output
rem also in source directory using default new file name or process
rem in a loop each PNG file separately with writing the optimized
rem image to output directory with same name as source file.

if /I "%SourceFolder%" == "%OutputFolder%" (
    "%ToolPath%pngquant.exe" --quality=40-55 --force *.png
) else (
    if not exist "%OutputFolder%" (
        md "%OutputFolder%"
        if errorlevel 1 (
            echo Failed to create the output folder:
            echo.
            echo %OutputFolder%
            echo.
            pause
            goto RestoreEnviroment
        )
    )
    for %%I in (*.png) do (
        "%ToolPath%pngquant.exe" --quality=40-55 --force --output "%OutputFolder%\%%I" "%%I"
    )
)

:RestoreEnviroment
rem Restore the previous current directory and delete the local copy of
rem the environment variables table, i.e. restore previous environment.
popd
endlocal

在启动/调用此批处理文件时，可以将源文件夹指定为第一个参数，将输出文件夹指定为第二个参数。

如果源文件夹应与批处理文件位于同一文件夹，并且在启动/调用此批处理文件时仅指定一个输出文件夹，则仅将 . 指定为当前文件夹的第一个参数。

要了解使用的命令及其工作原理，请打开命令提示符窗口，在其中执行以下命令，并仔细阅读为每个命令显示的所有帮助页面。

• echo/?
• endlocal/?
• for/?
• goto/?
• 如果/?
• md/?
• 暂停/?
• popd/?
• pushd/?
• rem/?
• 设置/?
• setlocal/?
• pngquant.exe -h