如何從PNG圖像中刪除空白區域並重新保存它們

Question

好吧我不知道這是可能的編程或不與任何軟件，但讓我們學習它。

現在讓我用實例來說明它

我使用paint.net魔術棒公差爲0％

空白

這裏空的空間刪除版本

這可能通過任何軟件做如C＃或Photoshop等

我需要做的批量處理

TY

Answer 1

我真的不知道這是否回答您的問題或沒有，但我希望它

這裏有一個代碼從Darren

public static Bitmap Crop(Bitmap bmp) 
    { 
     int w = bmp.Width; 
     int h = bmp.Height; 

     Func<int, bool> allWhiteRow = row => 
     { 
      for (int i = 0; i < w; ++i) 
       if (bmp.GetPixel(i, row).R != 255) 
        return false; 
      return true; 
     }; 

     Func<int, bool> allWhiteColumn = col => 
     { 
      for (int i = 0; i < h; ++i) 
       if (bmp.GetPixel(col, i).R != 255) 
        return false; 
      return true; 
     }; 

     int topmost = 0; 
     for (int row = 0; row < h; ++row) 
     { 
      if (allWhiteRow(row)) 
       topmost = row; 
      else break; 
     } 

     int bottommost = 0; 
     for (int row = h - 1; row >= 0; --row) 
     { 
      if (allWhiteRow(row)) 
       bottommost = row; 
      else break; 
     } 

     int leftmost = 0, rightmost = 0; 
     for (int col = 0; col < w; ++col) 
     { 
      if (allWhiteColumn(col)) 
       leftmost = col; 
      else 
       break; 
     } 

     for (int col = w - 1; col >= 0; --col) 
     { 
      if (allWhiteColumn(col)) 
       rightmost = col; 
      else 
       break; 
     } 

     if (rightmost == 0) rightmost = w; // As reached left 
     if (bottommost == 0) bottommost = h; // As reached top. 

     int croppedWidth = rightmost - leftmost; 
     int croppedHeight = bottommost - topmost; 

     if (croppedWidth == 0) // No border on left or right 
     { 
      leftmost = 0; 
      croppedWidth = w; 
     } 

     if (croppedHeight == 0) // No border on top or bottom 
     { 
      topmost = 0; 
      croppedHeight = h; 
     } 

     try 
     { 
      var target = new Bitmap(croppedWidth, croppedHeight); 
      using (Graphics g = Graphics.FromImage(target)) 
      { 
       g.DrawImage(bmp, 
        new RectangleF(0, 0, croppedWidth, croppedHeight), 
        new RectangleF(leftmost, topmost, croppedWidth, croppedHeight), 
        GraphicsUnit.Pixel); 
      } 
      return target; 
     } 
     catch (Exception ex) 
     { 
      throw new Exception(
       string.Format("Values are topmost={0} btm={1} left={2} right={3} croppedWidth={4} croppedHeight={5}", topmost, bottommost, leftmost, rightmost, croppedWidth, croppedHeight), 
       ex); 
     } 
    } 

去除環境從圖像 白色空間個

感謝，

我希望這有助於:)