C # Write Filter Picture tint counter effect (Invert)

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Invert English is called Upside down. The principle is simply that it will be 255-the original value.

So 0 (black) will become 255 (white) and 255 (white) will become 0 (black)

So the formula is to subtract R, G, and B by 255.

You can get the reversal value, the reason for this effect needs to be related to the previous negative film has a positive root negative

Most of us use negative negatives to wash out the colors that turn out to be the same as the photos you see.

C # Code:

View Sourceprint? 01. public  System.Drawing.Bitmap ConvertToInvert(System.Drawing.Image img) { 02. // 读入欲转换的图片并转成为 WritableBitmap www.it165.net 03. System.Drawing.Bitmap bitmap =  new  System.Drawing.Bitmap(img); 04. for  ( int  y = 0; y < bitmap.Height; y++) 05. { 06. for  ( int  x = 0; x < bitmap.Width; x++) 07. { 08. // 取得每一个 pixel 09. var pixel = bitmap.GetPixel(x, y); 10.  11. // 负片效果 将其反转 12. System.Drawing.Color newColor = System.Drawing.Color.FromArgb(pixel.A, 255 - pixel.R, 255 - pixel.G, 255 - pixel.B); 13.  14. bitmap.SetPixel(x, y, newColor); 15.  16. } 17. } 18. // 显示结果 19. return  bitmap; 20. }

Results:

C # Write Filter Picture tint counter effect (Invert)