Src/Private/Resize-Image.ps1
|
Function Resize-Image() { <# .SYNOPSIS Resize an image .DESCRIPTION Resize an image based on a new given height or width or a single dimension and a maintain ratio flag. The execution of this CmdLet creates a new file named "OriginalName_resized" and maintains the original file extension .PARAMETER Width The new width of the image. Can be given alone with the MaintainRatio flag .PARAMETER Height The new height of the image. Can be given alone with the MaintainRatio flag .PARAMETER ImagePath The path to the image being resized .PARAMETER MaintainRatio Maintain the ratio of the image by setting either width or height. Setting both width and height and also this parameter results in an error .PARAMETER Percentage Resize the image *to* the size given in this parameter. It's imperative to know that this does not resize by the percentage but to the percentage of the image. .PARAMETER SmoothingMode Sets the smoothing mode. Default is HighQuality. .PARAMETER InterpolationMode Sets the interpolation mode. Default is HighQualityBicubic. .PARAMETER PixelOffsetMode Sets the pixel offset mode. Default is HighQuality. .EXAMPLE Resize-Image -Height 45 -Width 45 -ImagePath "Path/to/image.jpg" .EXAMPLE Resize-Image -Height 45 -MaintainRatio -ImagePath "Path/to/image.jpg" .EXAMPLE #Resize to 50% of the given image Resize-Image -Percentage 50 -ImagePath "Path/to/image.jpg" .NOTES Written By: Christopher Walker #> [CmdLetBinding( SupportsShouldProcess = $true, PositionalBinding = $false, ConfirmImpact = "Medium", DefaultParameterSetName = "Absolute" )] Param ( [Parameter(Mandatory = $True)] [ValidateScript({ $_ | ForEach-Object { Test-Path $_ } })][String[]]$ImagePath, [Parameter(Mandatory = $False)][Switch]$MaintainRatio, [Parameter(Mandatory = $False, ParameterSetName = "Absolute")][Int]$Height, [Parameter(Mandatory = $False, ParameterSetName = "Absolute")][Int]$Width, [Parameter(Mandatory = $False, ParameterSetName = "Percent")][Double]$Percentage, [Parameter(Mandatory = $False)][System.Drawing.Drawing2D.SmoothingMode]$SmoothingMode = "HighQuality", [Parameter(Mandatory = $False)][System.Drawing.Drawing2D.InterpolationMode]$InterpolationMode = "HighQualityBicubic", [Parameter(Mandatory = $False)][System.Drawing.Drawing2D.PixelOffsetMode]$PixelOffsetMode = "HighQuality", [Parameter(Mandatory = $False)][String]$NameModifier = "resized" ) Begin { If ($Width -and $Height -and $MaintainRatio) { Throw "Absolute Width and Height cannot be given with the MaintainRatio parameter." } If (($Width -xor $Height) -and (-not $MaintainRatio)) { Throw "MaintainRatio must be set with incomplete size parameters (Missing height or width without MaintainRatio)" } If ($Percentage -and $MaintainRatio) { Write-Warning "The MaintainRatio flag while using the Percentage parameter does nothing" } } Process { ForEach ($Image in $ImagePath) { $Path = (Resolve-Path $Image).Path $Dot = $Path.LastIndexOf(".") #Add name modifier (OriginalName_{$NameModifier}.jpg) $OutputPath = $Path.Substring(0, $Dot) + "_" + $NameModifier + $Path.Substring($Dot, $Path.Length - $Dot) $OldImage = New-Object -TypeName System.Drawing.Bitmap -ArgumentList $Path # Grab these for use in calculations below. $OldHeight = $OldImage.Height $OldWidth = $OldImage.Width If ($MaintainRatio) { $OldHeight = $OldImage.Height $OldWidth = $OldImage.Width If ($Height) { $Width = $OldWidth / $OldHeight * $Height } If ($Width) { $Height = $OldHeight / $OldWidth * $Width } } If ($Percentage) { $Product = ($Percentage / 100) $Height = $OldHeight * $Product $Width = $OldWidth * $Product } $Bitmap = New-Object -TypeName System.Drawing.Bitmap -ArgumentList $Width, $Height $NewImage = [System.Drawing.Graphics]::FromImage($Bitmap) #Retrieving the best quality possible $NewImage.SmoothingMode = $SmoothingMode $NewImage.InterpolationMode = $InterpolationMode $NewImage.PixelOffsetMode = $PixelOffsetMode $NewImage.DrawImage($OldImage, $(New-Object -TypeName System.Drawing.Rectangle -ArgumentList 0, 0, $Width, $Height)) If ($PSCmdlet.ShouldProcess("Resized image based on $Path", "save to $OutputPath")) { $Bitmap.Save($OutputPath) } $Bitmap.Dispose() $NewImage.Dispose() $OldImage.Dispose() } } } |