PowerShell怎样将截图png质量改成256色
找了如下一段代码, 可以将屏幕截图, 可设质量, 但我想保存为256色的png图片, 如何设置? 请求路过高手指引, 提前感谢![code]function scr {param (
[string]$location,
[int]$quality,
[switch]$allscreen
)
Add-Type -AssemblyName system.windows.Forms
if ($allscreen.IsPresent)
{
$Capture = [system.windows.Forms.screen]::Allscreens
}
else
{
$Capture = [system.windows.Forms.Screen]::Primaryscreen
}
if ($Allscreens)
{
$Capture = [system.windows.Forms.screen]::Allscreens
}
else
{
$Capture = [system.windows.Forms.Screen]::PrimaryScreen
}
foreach ($C in $Capture)
{
$filename = $location + (get-date).ToString("yyy-M-dd-H-ss") + ".png"
$Bitmap = New-object System.Drawing.Bitmap($C.Bounds.width, $C.Bounds.Height)
$G = [System.Drawing.Graphics]::FromImage($Bitmap)
$G.CopyFromscreen($C.Bounds.Location, (New-object system.Drawing.Point(0, 0)), $C.Bounds.Size)
$G.Dispose()
$Encoderparam = [system.Drawing.Imaging.Encoder]::Quality
$Encoderparamset = New-object System.Drawing.Imaging.EnCoderparameters(1)
$Encoderparamset.Param[0] = New-object system.Drawing.Imaging.Encoderparameter($Encoderparam, $Quality)
$JPGCodec = [system.Drawing.Imaging.ImageCodecInfo]::GetImageEncoders() | where{
$_.MimeType -eq 'image/png' #可设 jpeg gif png }
$Bitmap.Save($FileName, $JPGCodec, $Encoderparamset)
}
}
scr -location "C:\Users\Administrator\Desktop\" -quality 80 -allscreen [/code] 另存为gif 颜色数就256了, 但是有好多噪点, 我从png手动另存为gif就没有噪点, 期待高手指引一下 国外找了段代码, 但是一直报错[code]
# PowerShell gif encoding + wrapper around https://www.developerfusion.com/code/4630/capture-a-screen-shot/
Add-Type -TypeDefinition @'
using System;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;
namespace GDI
{
/// <summary>
/// Provides functions to capture the entire screen, or a particular window, and save it to a file.
/// </summary>
public class ScreenCapture
{
/// <summary>
/// Creates an Image object containing a screen shot of the entire desktop
/// </summary>
/// <returns></returns>
public Image CaptureScreen()
{
return CaptureWindow( User32.GetDesktopWindow() );
}
/// <summary>
/// Creates an Image object containing a screen shot of a specific window
/// </summary>
/// <param name="handle">The handle to the window. (In windows forms, this is obtained by the Handle property)</param>
/// <returns></returns>
public Image CaptureWindow(IntPtr handle)
{
// get te hDC of the target window
IntPtr hdcSrc = User32.GetWindowDC(handle);
// get the size
User32.RECT windowRect = new User32.RECT();
User32.GetWindowRect(handle,ref windowRect);
int width = windowRect.right - windowRect.left;
int height = windowRect.bottom - windowRect.top;
// create a device context we can copy to
IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,width,height);
// select the bitmap object
IntPtr hOld = GDI32.SelectObject(hdcDest,hBitmap);
// bitblt over
GDI32.BitBlt(hdcDest,0,0,width,height,hdcSrc,0,0,GDI32.SRCCOPY);
// restore selection
GDI32.SelectObject(hdcDest,hOld);
// clean up
GDI32.DeleteDC(hdcDest);
User32.ReleaseDC(handle,hdcSrc);
// get a .NET image object for it
Image img = Image.FromHbitmap(hBitmap);
// free up the Bitmap object
GDI32.DeleteObject(hBitmap);
return img;
}
/// <summary>
/// Captures a screen shot of a specific window, and saves it to a file
/// </summary>
/// <param name="handle"></param>
/// <param name="filename"></param>
/// <param name="format"></param>
public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format)
{
Image img = CaptureWindow(handle);
img.Save(filename,format);
}
/// <summary>
/// Captures a screen shot of the entire desktop, and saves it to a file
/// </summary>
/// <param name="filename"></param>
/// <param name="format"></param>
public void CaptureScreenToFile(string filename, ImageFormat format)
{
Image img = CaptureScreen();
img.Save(filename,format);
}
/// <summary>
/// Helper class containing Gdi32 API functions
/// </summary>
private class GDI32
{
public const int SRCCOPY = 0x00CC0020; // BitBlt dwRop parameter
[DllImport("gdi32.dll")]
public static extern bool BitBlt(IntPtr hObject,int nXDest,int nYDest,
int nWidth,int nHeight,IntPtr hObjectSource,
int nXSrc,int nYSrc,int dwRop);
[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC,int nWidth,
int nHeight);
[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
[DllImport("gdi32.dll")]
public static extern bool DeleteDC(IntPtr hDC);
[DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);
[DllImport("gdi32.dll")]
public static extern IntPtr SelectObject(IntPtr hDC,IntPtr hObject);
}
/// <summary>
/// Helper class containing User32 API functions
/// </summary>
private class User32
{
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
}
[DllImport("user32.dll")]
public static extern IntPtr GetDesktopWindow();
[DllImport("user32.dll")]
public static extern IntPtr GetWindowDC(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern IntPtr ReleaseDC(IntPtr hWnd,IntPtr hDC);
[DllImport("user32.dll")]
public static extern IntPtr GetWindowRect(IntPtr hWnd,ref RECT rect);
}
}
}
'@ -Language CSharp -ReferencedAssemblies system.drawing
function Capture-Screen
{
param (
[GDI.ScreenCapture]$SC
)
$Filename = Join-Path $PWD "capt$(Date -Format yyMMddhhmmssffff).bmp"
$SC.CaptureWindowToFile((Get-Process -Id $PID).MainWindowHandle, $Filename, 'Bmp')
}
# Generate some random output, take screenshots
0 .. 10 | %{
Get-Random
Capture-Screen -SC $sc
Start-Sleep -Milliseconds 200
}
$enc = [System.Windows.Media.Imaging.GifBitmapEncoder]::new()
foreach ($frame in Get-ChildItem .\capt*.bmp)
{
$bmp = [System.Drawing.Bitmap]::FromFile($frame.FullName)
$hbmp = $bmp.GetHbitMap()
$bmpsrc = [System.Windows.Interop.Imaging]::CreateBitmapSourceFromHBitmap($hbmp, [System.IntPtr]::Zero, 'Empty', [System.Windows.Media.Imaging.BitmapSizeOptions]::FromEmptyOptions())
$enc.Frames.Add([System.Windows.Media.Imaging.BitmapFrame]::Create($bmpsrc))
$hbmp = $bmp = $null
}
$filestream = [System.IO.File]::Create((Join-Path $PWD output.gif))
$enc.Save($filestream)
Remove-Item .\capt*.bmp
[/code] 这是不是绕了什么弯路？
虽然不懂Powershell [b]回复 [url=http://www.bathome.net/redirect.php?goto=findpost&pid=256048&ptid=62826]4#[/url] [i]523066680[/i] [/b]
有可能
gg搜索了一下, C#实现 png转8位256色png, 是个"世界难题", 好多解决办法都用别的组件了, 或用很长的代码实现的 :lol
存成gif是现成的, 但是会有噪点, 坐等高手指路 [i=s] 本帖最后由 5i365 于 2022-5-24 21:32 编辑 [/i]
gif解决噪点, 找到一个文章, 但是不能下载, 估计很麻烦,
[url=https://www.cnblogs.com/mier/archive/2009/04/26/1443699.html]https://www.cnblogs.com/mier/archive/2009/04/26/1443699.html[/url]
哎, 感觉自己解决问题, 好吃力, 遇到的问题, 都是难题, 还是我水平太low了 :dizzy: 一楼的改一下27行试试[code]$Bitmap = New-object System.Drawing.Bitmap($C.Bounds.width, $C.Bounds.Height,198659)
#https://docs.microsoft.com/zh-cn/dotnet/api/system.drawing.bitmap.-ctor#system-drawing-bitmap-ctor(system-int32-system-int32-system-int32-system-drawing-imaging-pixelformat-system-intptr)
#https://docs.microsoft.com/zh-cn/dotnet/api/system.drawing.imaging.pixelformat[/code] [i=s] 本帖最后由 5i365 于 2022-5-25 07:00 编辑 [/i]
[b]回复 [url=http://www.bathome.net/redirect.php?goto=findpost&pid=256062&ptid=62826]7#[/url] [i]idwma[/i] [/b]
感谢大侠指引, 加上后,会报如下错误, 并生成了一个全黑的图片
ERROR: Exception calling "FromImage" with "1" argument(s): "A Graphics object cannot be created from an image that has an indexed pixel format."
我需要的就是将屏幕截为一张
没有噪点的gif图片
或者8位的png图片, 都可以, 因为别的格式图片体积太大了
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