Invert Image using FreeImage.dll

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Hi Guys and Gals ....

I am using FreeImage to manipulate images that come through a fax system. The recieved images are being inverted (black to white) when they are saved. So therefore I need assistance in inverting the images that were inverted. The code below demontrates my objective. Any help would be appreciated. Thanks in advance.

C#

private void listViewPageViewer_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                if (pan != null)
                    pan.Dispose();

                if (listViewPageViewer.SelectedItems.Count == 0)
                {
                    return;
                }

                //int i = listViewPageViewer.SelectedItems[0].Index;
                int i = Convert.ToInt32(listViewPageViewer.SelectedItems[0].Name);

                savedImage = SourcePath + "Page_" + (i + 1).ToString() + ".tif";

                if (!File.Exists(savedImage))
                {
                    try
                    {
                        GlobalVariables.ImagePath = savedImage;
                        FIMULTIBITMAP dib = FreeImage.OpenMultiBitmapEx(strDocumentPath);
                        FIBITMAP page = FreeImage.LockPage(dib, i);
                        Image temp = FreeImage.GetBitmap(page);
                        


                       // I need to invert the image here before I save it to file


                        temp.Save(savedImage);
                        temp.Dispose();
                        temp = null;
                        pan = Image.FromFile(savedImage);
                        FreeImage.UnlockPage(dib, page, false);
                        PanBox.Image = pan;

                        FreeImage.CloseMultiBitmapEx(ref dib);

                        pan = Image.FromFile(savedImage);
                        PanBox.Image = pan;

                        originalImageHeight = pan.Height;
                        originalImageWidth = pan.Width;
                    }
                    catch
                    {
                    }
                }
            }
            catch
            {
            }
        }

Posted 15-Apr-12 22:54pm

Rico_

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2 solutions

Solution 1

Try:

FreeImage.Invert(temp);

Posted 16-Apr-12 5:31am

Helge Meyer

Comments

Rico_ 17-Apr-12 2:55am

Hi , thanks for your responce. I have tried that and got the error below. Im looking for another way around this.

Error 5 The best overloaded method match for 'FreeImageAPI.FreeImage.Invert(FreeImageAPI.FIBITMAP)' has some invalid arguments C:\DocSplitCurrent\DocSplitNew\PageViewer.cs 1196 25 DocSplitNew

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Rico_ · Accepted Answer · 2012-04-17T00:04:00

Hi , I have found a solution on the net using GDI+, it seems to work for now, so i guess I am going to stick to this solution for now or until something else is needed.
Thanks for your help guys.

C#

if (temp.PixelFormat == PixelFormat.Format1bppIndexed)
    {
       Image img = temp;
       Bitmap bmpInverted = new Bitmap(img.Width, img.Height);
       ImageAttributes ia = new ImageAttributes();
       ColorMatrix cmPicture = 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}
               });


        ia.SetColorMatrix(cmPicture);
        Graphics g = Graphics.FromImage(bmpInverted);
        g.DrawImage(img, new Rectangle(0, 0, img.Width, img.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, ia);
        g.Dispose();

        temp.Save(savedImage); 
        img.Dispose();