private void ApplyColorFilter() { if (prvImage != null) { ColorSwapFilter swapFilter = new ColorSwapFilter(); swapFilter.SwapType = (ColorSwapFilter.ColorSwapType)cmbColorSwapping.SelectedItem; //swapFilter.InvertColorsWhenSwapping = chkInvertColours.Checked; //swapFilter.SwapHalfColorValues = chkHalfColours.Checked; previewImgBox.Image = ((Bitmap)(prvImage)).SwapColorsCopy(swapFilter); } }
public static Bitmap SwapColorsCopy(this Bitmap originalImage, ColorSwapFilter swapFilterData) { BitmapData sourceData = originalImage.LockBits (new Rectangle(0, 0, originalImage.Width, originalImage.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb); byte[] resultBuffer = new byte[sourceData.Stride * sourceData.Height]; Marshal.Copy(sourceData.Scan0, resultBuffer, 0, resultBuffer.Length); originalImage.UnlockBits(sourceData); byte sourceBlue = 0, resultBlue = 0, sourceGreen = 0, resultGreen = 0, sourceRed = 0, resultRed = 0; byte byte2 = 2, maxValue = 255; for (int k = 0; k < resultBuffer.Length; k += 4) { sourceBlue = resultBuffer[k]; sourceGreen = resultBuffer[k + 1]; sourceRed = resultBuffer[k + 2]; if (swapFilterData.InvertColorsWhenSwapping == true) { sourceBlue = (byte)(maxValue - sourceBlue); sourceGreen = (byte)(maxValue - sourceGreen); sourceRed = (byte)(maxValue - sourceRed); } if (swapFilterData.SwapHalfColorValues == true) { sourceBlue = (byte)(sourceBlue / byte2); sourceGreen = (byte)(sourceGreen / byte2); sourceRed = (byte)(sourceRed / byte2); } switch (swapFilterData.SwapType) { case ColorSwapFilter.ColorSwapType.ShiftRight: { resultBlue = sourceGreen; resultRed = sourceBlue; resultGreen = sourceRed; break; } case ColorSwapFilter.ColorSwapType.ShiftLeft: { resultBlue = sourceRed; resultRed = sourceGreen; resultGreen = sourceBlue; break; } case ColorSwapFilter.ColorSwapType.SwapBlueAndRed: { resultBlue = sourceRed; resultRed = sourceBlue; break; } case ColorSwapFilter.ColorSwapType.SwapBlueAndGreen: { resultBlue = sourceGreen; resultGreen = sourceBlue; break; } case ColorSwapFilter.ColorSwapType.SwapRedAndGreen: { resultRed = sourceGreen; resultGreen = sourceGreen; break; } } resultBuffer[k] = resultBlue; resultBuffer[k + 1] = resultGreen; resultBuffer[k + 2] = resultRed; } Bitmap resultBitmap = new Bitmap(originalImage.Width, originalImage.Height, PixelFormat.Format32bppArgb); BitmapData resultData = resultBitmap.LockBits (new Rectangle(0, 0, resultBitmap.Width, resultBitmap.Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb); Marshal.Copy(resultBuffer, 0, resultData.Scan0, resultBuffer.Length); resultBitmap.UnlockBits(resultData); return(resultBitmap); }