亮度方法显示“内存不足".例外 [英] Brightness method shows "Out of memory" exception

问题描述

要更改c#.net 4中图像的亮度，我使用了以下方法.

To change brightness of an image in c#.net 4 i have used the following method.

public void SetBrightness(int brightness)
       {
           imageHandler.RestorePrevious();
           if (brightness < -255) brightness = -255;
           if (brightness > 255) brightness = 255;
           ColorMatrix cMatrix = new ColorMatrix(CurrentColorMatrix.Array);
           cMatrix.Matrix40 = cMatrix.Matrix41 = cMatrix.Matrix42 = brightness / 255.0F;
           imageHandler.ProcessBitmap(cMatrix);
       }

         internal void ProcessBitmap(ColorMatrix colorMatrix)
             {
               Bitmap bmap = new Bitmap(_currentBitmap.Width, _currentBitmap.Height)

               ImageAttributes imgAttributes = new ImageAttributes();
               imgAttributes.SetColorMatrix(colorMatrix);
               Graphics g = Graphics.FromImage(bmap);
               g.InterpolationMode = InterpolationMode.NearestNeighbor;
               g.DrawImage(_currentBitmap, new Rectangle(0, 0, _currentBitmap.Width,
               _currentBitmap.Height), 0, 0, _currentBitmap.Width,
               _currentBitmap.Height,  GraphicsUnit.Pixel, imgAttributes);
               _currentBitmap = (Bitmap)bmap.Clone();


           }

如果亮度多次更改，则会显示内存不足"异常.我曾尝试使用使用块"，但还是顺其自然.

有什么想法吗?

请查看链接
在C#中使用矩阵进行图像处理
并建议方法中是否可以进行任何类型的优化(旋转，亮度，裁剪和撤消).

If brightness is changed several times then "Out of memory" exception is shown. I have tried to use "Using block" but went in vein.

Any ideas?

please see the link
Image Processing Using Matrices in C#
and suggest if any types of optimization is possible in the methods (Rotation, brightness, crop and undo).

推荐答案

尝试处理旧的位图:每次调用ProcessBitmap时您还要再构建两个(一个以new Bitmap开头，另一个以bmap.Clone结尾).
在分配新值之前，请在_currentBitmap上使用Dispose，并且根本不执行Clone，因为它实际上并没有做任何有用的事情-它只需要时间和内存.

Try disposing of old bitmaps: each time you call ProcessBitmap you build two more (one with the new Bitmap at teh beginning, and another with the bmap.Clone at the end).
Use Dispose on _currentBitmap before you assign the new value, and don''t do the Clone at all since it really doesn''t do anything useful - it just takes time and memory.

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