Get the detail informations from a .png file in PowerShell

• You might want to use the PowershellPack Module which contains get-image:

  PS D:\> import-module psimagetools
  PS D:\> get-item .\fig410.png | get-image
  FullName              : D:\fig410.png
  FormatID              : {B96B3CAF-0728-11D3-9D7B-0000F81EF32E}
  FileExtension         : png
  FileData              : System.__ComObject
  ARGBData              : System.__ComObject
  Height                : 450
  Width                 : 700
  HorizontalResolution  : 96,0119934082031
  VerticalResolution    : 96,0119934082031
  PixelDepth            : 32
  IsIndexedPixelFormat  : False
  IsAlphaPixelFormat    : True
  IsExtendedPixelFormat : False
  IsAnimated            : False
  FrameCount            : 1
  ActiveFrame           : 1
  Properties            : System.__ComObject
  

• or you could use Wia.ImageFile directly (which is how the get-image function does it) this way:

  PS D:\> $image  = New-Object -ComObject Wia.ImageFile
  PS D:\> $image.loadfile("D:\fig410.png")
  PS D:\> $image
  
  FormatID              : {B96B3CAF-0728-11D3-9D7B-0000F81EF32E}
  FileExtension         : png
  FileData              : System.__ComObject
  ARGBData              : System.__ComObject
  Height                : 450
  Width                 : 700
  HorizontalResolution  : 96,0119934082031
  VerticalResolution    : 96,0119934082031
  PixelDepth            : 32
  IsIndexedPixelFormat  : False
  IsAlphaPixelFormat    : True
  IsExtendedPixelFormat : False
  IsAnimated            : False
  FrameCount            : 1
  ActiveFrame           : 1
  Properties            : System.__ComObject
  

You can get most of this information from the files extended properties like this:

$path = 'D:\image.png'
$shell = New-Object -COMObject Shell.Application
$folder = Split-Path $path
$file = Split-Path $path -Leaf
$shellfolder = $shell.Namespace($folder)
$shellfile = $shellfolder.ParseName($file)

$width = 27
$height = 28
$Dimensions = 26
$size = 1

$shellfolder.GetDetailsOf($shellfile, $width)
$shellfolder.GetDetailsOf($shellfile, $height)
$shellfolder.GetDetailsOf($shellfile, $Dimensions)
$shellfolder.GetDetailsOf($shellfile, $size)

You can also get the size in other ways such as (Get-Item D:\image.png).Length / 1KB.

The bit depth property doesn't seem to be listed in the extended properties though even though its available when you right click the file.

Update Another option is to use .NET proper to avoid using COM:

add-type -AssemblyName System.Drawing
$png = New-Object System.Drawing.Bitmap 'D:\image.png'
$png.Height
$png.Width
$png.PhysicalDimension
$png.HorizontalResolution
$png.VerticalResolution

Update 2 The PixelFormat property gives you the bit depth.

$png.PixelFormat

The property is an enumeration of possible formats. You can view the complete list here.

For example, Format32bppArgb is defined as

Specifies that the format is 32 bits per pixel; 8 bits each are used for the alpha, red, green, and blue components.