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标题: [问题求助] PowerShell怎样将截图png质量改成256色 [打印本页]
作者: 5i365 时间: 2022-5-24 14:18 标题: 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!- 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
复制代码
作者: 5i365 时间: 2022-5-24 18:28
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
作者: 5i365 时间: 2022-5-24 18:49
国外找了段代码, 但是一直报错- # 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
复制代码
作者: 523066680 时间: 2022-5-24 19:28
这是不是绕了什么弯路?
虽然不懂Powershell
作者: 5i365 时间: 2022-5-24 20:14
回复 4# 523066680
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 ![](images/smilies/default/lol.gif)
存成gif是现成的, 但是会有噪点, 坐等高手指路
作者: 5i365 时间: 2022-5-24 21:29
本帖最后由 5i365 于 2022-5-24 21:32 编辑
gif解决噪点, 找到一个文章, 但是不能下载, 估计很麻烦,
https://www.cnblogs.com/mier/archive/2009/04/26/1443699.html
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 ![](images/smilies/default/dizzy.gif)
作者: idwma 时间: 2022-5-24 23:39
一楼的改一下27行试试- $Bitmap = New-object System.Drawing.Bitmap($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
复制代码
作者: 5i365 时间: 2022-5-25 06:57
本帖最后由 5i365 于 2022-5-25 07:00 编辑
回复 7# idwma
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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