Question

我需要将文件夹和子文件夹中的所有图片转换为jpg。我需要用命令文件批处理这个过程。 GUI工具针对我来说我需要脚本。

我尝试使用来自ImageMagick的mogrify.exe，还有convert.exe函数，但是afaik都可以转换图像。

我写了下一个剧本：

$rootdir = "E:\Apps\скрипты\temp1\graphics"
$files = dir -r -i *.png $rootdir
foreach ($file in $files) {.\mogrify.exe -format png *jpg $file}

但这不起作用，当我尝试运行它时，我遇到了错误：

mogrify.exe: unable to open file `*jpg' @ error/png.c/ReadPNGImage/3633.
mogrify.exe: Improper image header `E:\Apps\скрипты\temp1\graphics\telluric\day\
Athens\2011-07-03-17.png' @ error/png.c/ReadPNGImage/3641.
mogrify.exe: unable to open image `*jpg': Invalid argument @ error/blob.c/OpenBl
ob/2588.

我也找到下一个代码：

[Reflection.Assembly]::LoadWithPartialName('System.Drawing')

$img=[Drawing.Image]::FromFile("$(cd)\Max.jpg")
$img.Save("$(cd)\max.gif", 'Gif')
$img.Dispose()

我怎样才能让它与dirs树一起工作并将png和tiff转换为jpg？

Answer 1

我已经做了类似的事情，将位图文件转换为图标文件：

http://sev17.com/2011/07/creating-icons-files/

我根据您的要求调整了它并测试了将图像文件转换为jpg的功能：

function ConvertTo-Jpg
{
    [cmdletbinding()]
    param([Parameter(Mandatory=$true, ValueFromPipeline = $true)] $Path)

    process{
        if ($Path -is [string])
        { $Path = get-childitem $Path }

        $Path | foreach {
            $image = [System.Drawing.Image]::FromFile($($_.FullName));
            $FilePath = [IO.Path]::ChangeExtension($_.FullName, '.jpg');
            $image.Save($FilePath, [System.Drawing.Imaging.ImageFormat]::Jpeg);
            $image.Dispose();
        }
    }

 }

 #Use function:
 #Cd to directory w/ png files
 cd .\bin\pngTest

 #Run ConvertTo-Jpg function
 Get-ChildItem *.png | ConvertTo-Jpg

Answer 2

我改编了Chad Miller's answer，以便在此博文中添加设置JPEG质量等级的功能：
Benoît Patra's blog: Resize image and preserve ratio with Powershell

# Try uncommenting the following line if you receive errors about a missing assembly
# [void][System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
function ConvertTo-Jpg
{
  [cmdletbinding()]
  param([Parameter(Mandatory=$true, ValueFromPipeline = $true)] $Path)

  process{
    $qualityEncoder = [System.Drawing.Imaging.Encoder]::Quality
    $encoderParams = New-Object System.Drawing.Imaging.EncoderParameters(1)

    # Set JPEG quality level here: 0 - 100 (inclusive bounds)
    $encoderParams.Param[0] = New-Object System.Drawing.Imaging.EncoderParameter($qualityEncoder, 100)
    $jpegCodecInfo = [System.Drawing.Imaging.ImageCodecInfo]::GetImageEncoders() | where {$_.MimeType -eq 'image/jpeg'}

    if ($Path -is [string]) {
      $Path = get-childitem $Path
    }

    $Path | foreach {
      $image = [System.Drawing.Image]::FromFile($($_.FullName))
      $filePath =  "{0}\{1}.jpg" -f $($_.DirectoryName), $($_.BaseName)
      $image.Save($filePath, $jpegCodecInfo, $encoderParams)
      $image.Dispose()
    }
  }
}

#Use function:
# cd to directory with png files
cd .\bin\pngTest


#Run ConvertTo-Jpg function
Get-ChildItem *.png | ConvertTo-Jpg

将所有图像转换为jpg

2 个答案: