Invert color image in MVC C#

Question

1.00/5 (1 vote)

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invert color image in MVC C#

What I have tried:

[HttpPost]
        public JsonResult InvertColorMatrix(Image imgSource, string directoryPath)
        {
            string imageFullPath = String.Empty;
            int currentOffSet = 0, imageLength = 0;
            //DataCorrectionViewModel listDCViewModel = (DataCorrectionViewModel)TempData.Peek("ListDCViewModel");
            DataCorrectionViewModel listDCViewModel = (DataCorrectionViewModel)TempData.Peek("ListDCViewModel");
            DCImageViewModel imageViewModel = listDCViewModel.Item.ImageData;

            //directoryPath = @"C:\RL520DAT\Images";
            directoryPath = string.IsNullOrEmpty(directoryPath) ? "C:\\RL520DAT\\Images" : directoryPath;
              
               imageFullPath = directoryPath + "\\" + imageViewModel.Image_Path.ToString() + ".FIM";
               imageLength = Convert.ToInt32(imageViewModel.Cap_Front_Image_Size);
               currentOffSet = Convert.ToInt32(imageViewModel.Image_Offset);
                
                //Bitmap bmpDest = new Bitmap(imgSource.Width, imgSource.Height);
                Bitmap bmpDest = new Bitmap(imgSource.Width, imgSource.Height);
            ColorMatrix clrMatrix = new ColorMatrix(new float[][] {
            new float[] { -1, 0, 0, 0, 0 },
            new float[] { 0, -1, 0, 0, 0 },
            new float[] { 0, 0, -1, 0, 0 },
            new float[] { 0, 0, 0, 1, 0 },
            new float[] { 1, 1, 1, 0, 1 }
    });

            using (ImageAttributes attrImage = new ImageAttributes())
            {
                attrImage.SetColorMatrix(clrMatrix);

                using (Graphics g = Graphics.FromImage(bmpDest))
                {
                    g.DrawImage(imgSource, new Rectangle(0, 0, imgSource.Width, imgSource.Height), 0, 0, imgSource.Width, imgSource.Height, GraphicsUnit.Pixel, attrImage);
                }
            }
            //return bmpDest;
            return Json(bmpDest, JsonRequestBehavior.AllowGet);
        }

Posted 17-Nov-19 20:32pm

Member 14655234

Updated 18-Nov-19 1:27am

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F-ES Sitecore 18-Nov-19 4:58am

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RickZeeland · Answer 1 · 2019-11-18T01:28:00

Try this example from c# - Inverting image returns a black image - Stack Overflow[^] :

public Bitmap Transform(Bitmap source)
{
    //create a blank bitmap the same size as original
    Bitmap newBitmap = new Bitmap(source.Width, source.Height);

    //get a graphics object from the new image
    Graphics g = Graphics.FromImage(newBitmap);

    // create the negative color matrix
    ColorMatrix colorMatrix = new ColorMatrix(new float[][]
    {
new float[] {-1, 0, 0, 0, 0},
new float[] {0, -1, 0, 0, 0},
new float[] {0, 0, -1, 0, 0},
new float[] {0, 0, 0, 1, 0},
new float[] {1, 1, 1, 0, 1}
    });

    // create some image attributes
    ImageAttributes attributes = new ImageAttributes();

    attributes.SetColorMatrix(colorMatrix);

    g.DrawImage(source, new Rectangle(0, 0, source.Width, source.Height),
                0, 0, source.Width, source.Height, GraphicsUnit.Pixel, attributes);

    //dispose the Graphics object
    g.Dispose();

    return newBitmap;
}

I tested it with a JPG and it works for me ...