I am trying to make an upscale texture mod for an old game "Recoil".

For this, I need to find the height, width, pixel format and colour count of a few 1000 images, so that I can feed this information to excel and find the best textures to be upscaled.

I have been able to get the height, width and pixel format via a PowerShell script, which I can then copy to excel as this script provides a table. the script works on the whole folder.

Function Get-Image{
Param(
     [Parameter(ValueFromPipeline=$true)]
     [System.IO.FileINfo]$file
)
begin{        
     [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing") |Out-Null 
}
process{
      if( $file.Exists){
           $img=[System.Drawing.Image]::FromFile($file)
           $image=$img.Clone()
           $img.Dispose()
           $image | Add-Member `
                          -MemberType NoteProperty `
                          -Name Filename `
                          -Value $file.FUllname `
                          -PassThru
      }else{
           Write-Host "File not found: $file" -fore yellow       
      }   
 }    
end{}
}
dir C:\test\*.png | Get-Image
dir C:\test\*.png -Recurse | Get-Image  | select filename, Width, Height,     PixelFormat | ft -auto

the result of the above code

I need help finding a way to get a colour count of the images. I have found a manual way to do it via a Photoshop filter but it is not a viable way to do all the images. photoshop filter example

If I can get the Colour count in a similar way to the code provided it would be the best.

edit: I need a way to get Colour count of all images in the folder.

the images themselves are small (the biggest being 512x512). I just need the number of colours, no need for the breakdown of RGB.

ps- I have literally no knowledge of programming and scripting ( even the above script someone Reddit helped me out with)

Hopefully, I have been able to explain my query clearly. Thank you for your time and consideration.

CodePudding user response：

Use the GetPixel() method to fetch the color used for each pixel, then count the unique colors you encounter:

$hashset = [System.Collections.Generic.HashSet[System.Drawing.Color]]::new()

foreach($x in 0..($image.Width - 1)){
  foreach($y in 0..($image.Height - 1)){
    [void]$hashset.Add($image.GetPixel($x, $y))
  }
}

Write-Host "Image has $($hashset.Count) unique colors"

You could add this routine to your existing function like so:

process {
    if ($file.Exists) {
        # Load image
        $img = [System.Drawing.Image]::FromFile($file)
        $image = $img.Clone()
        $img.Dispose()

        # Count colors
        $colorSet = [System.Collections.Generic.HashSet[System.Drawing.Color]]::new()
        foreach ($x in 0..($image.Width - 1)) {
            foreach ($y in 0..($image.Height - 1)) {
                [void]$colorSet.Add($image.GetPixel($x, $y))
            }
        }

        # Add file name and color count properties to image object
        $fileNameProp = @{ MemberType = 'NoteProperty'; Name = 'Filename'; Value = $file.FullName; PassThru = $true}
        $colorCountProp = @{ MemberType = 'NoteProperty'; Name = 'ColorCount'; Value = $colorSet.Count; PassThru = $true}
        $image | Add-Member @fileNameProp | Add-Member @colorCountProp
    }
    else {
        Write-Host "File not found: $file" -fore yellow       
    }   
}

And now you can do:

dir C:\test\*.png -Recurse | Get-Image | ft Filename, Width, Height, PixelFormat, ColorCount -AutoSize