如何删除位图中的像素? [英] how can a pixel in a bitmap can be deleted?

问题描述

降低位图的分辨率.我在以下网站上找到了一种方法

对所有周围像素的值求平均值，将该值存储在选定的像素位置，然后删除所有周围像素.因此4 * 6矩阵变为4 x 3矩阵.

我正在通过此代码访问像素

  for ( int  y =  0 ; y< bmp.bmHeight; y ++)
  {
       for ( int  x =  0 ; x < bmp.bmWidth; x ++)
      {
          COLORREF rgb = dc.GetPixel(x，y);
          BYTE r = GetRValue(rgb);
          字节g = GetGValue(rgb);
          字节b = GetBValue(rgb);
          dc.SetPixel(x，y，RGB(r，g，b));
      }
  } 

告诉我如何删除像素?

解决方案

我不认为您可以(或者真的想要这么做，这会破坏循环)执行平均值).

IMO需要做的是以新分辨率的大小创建目标.bmp，然后将平均值复制到相应的像素中.这也会为您留出还原"选项以备将来使用.

i m decreasing the resolution of a bitmap. i found a method on a site which is as follows

Average the values of all surrounding pixels, store that value in the choosen pixel location, then delete all the surrounding pixels.so a 4*6 matrix becomes a 4 x 3 matrix.

i am accessing pixels by this code

for(int y = 0; y < bmp.bmHeight; y++)
  {
      for(int x = 0; x < bmp.bmWidth; x++)
      {
          COLORREF rgb = dc.GetPixel(x, y);
          BYTE r = GetRValue(rgb);
          BYTE g = GetGValue(rgb);
          BYTE b = GetBValue(rgb);
          dc.SetPixel(x, y, RGB(r,g,b));
      }
  }

tell me how can i delete a pixel?

解决方案

I don''t think you can (or would really want to for that ,matter, it would smash the loop performing the averages).

What you need to do IMO is to create a target .bmp at the size of the new resolution, and copy the averaged values into corresponding pixel. This will also leave you an "revert" option for future use.

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