使用PowerShell获取图像的调色板 [英] Get Color Palette of Image using PowerShell

问题描述

我正在尝试获取图像的调色板。我尝试了各种方法，现在在 PowerShell 中使用以下代码，但无法获得正确的结果：

I am trying to get the Color Palette of an image. I tried various methods, and now I use the following code in PowerShell, but I could not get the correct result:

$filename = "C:\Users\schoo\Desktop\bb.jpg"
$BitMap = [System.Drawing.Bitmap]::FromFile((Get-Item $filename).fullname) 

Foreach($y in (1..($BitMap.Height-1))){ 

  Foreach($x in (1..($BitMap.Width-1))){ 

         $Pixel = $BitMap.GetPixel($X,$Y)         
         $BackGround = $Pixel.Name
         }

$R = $Pixel | select -ExpandProperty R
$G = $Pixel | select -ExpandProperty G
$B = $Pixel | select -ExpandProperty B
$A = $Pixel | select -ExpandProperty A

$allClr = "$R" + "." + "$G" + "." + "$B" + "." + "$A"
$allClr  
}

结果带给我更多超过一千个 RGB 代码：

The result take me more than thousand RGB codes:

推荐答案

我认为，调色板是指图像中出现的不同色带。

I assume that by "color palette" you mean the swathe of distinct colours that appear in the image.

仅选择集合的不同子集的一种简单（且非常快速）的方法是使用哈希表。

A simple (and quite fast) way to select only a distinct subset of a collection is to use a hashtable.

$filename =  'C:\Users\schoo\Desktop\bb.jpg'
$BitMap = [System.Drawing.Bitmap]::FromFile((Resolve-Path $filename).ProviderPath)

# A hashtable to keep track of the colors we've encountered
$table = @{}
foreach($h in 1..$BitMap.Height){
  foreach($w in 1..$BitMap.Width) {
    # Assign a value to the current Color key
    $table[$BitMap.GetPixel($w - 1,$h - 1)] = $true
  }
}

# The hashtable keys is out palette
$palette = $table.Keys

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