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9.2

asp.net c# image resize and recrop problem

Asked by applefruit in .NET Framework 1.x, .NET Framework 2.x, Programming for ASP.NET

Tags: asp.net, c#

Hi,

I have a ImageCrop method which will resize and recrop the image to a specific size. However when the image has been resize and recrop, there is a thin black line on the top of the image. I think its something got to do in the ImageCrop method, which is cause this problem, Could anyone advice me on what should i do, so that the thin black line will not be there? Thanks.

I have attached a screenshot of the problem. So that you can have a better understanding.

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             //SAVING THE LARGE IMAGE
photoL = "photo.L." + args.FileGuid + "." + args.FileName;
args.CopyTo(Path.Combine(SampleUtil.GetFileDirectory(), photoL));
 
System.Drawing.Image imgSaved = System.Drawing.Image.FromFile(Path.Combine(SampleUtil.GetFileDirectory(), photoL));
System.Drawing.Image imgCroped;
 
imgCroped = ImageCrop(imgSaved, 100, 100, AnchorPosition.Top);
photoM = "photo.M." + imgCroped.GetHashCode() + "." + args.FileName;
imgCroped.Save(Server.MapPath("Photo/" + photoM), ImageFormat.Jpeg);
 
imgCroped = ImageCrop(imgSaved, 60, 60, AnchorPosition.Top);
photoS = "photo.S." + imgCroped.GetHashCode() + "." + args.FileName;
imgCroped.Save(Server.MapPath("Photo/" + photoS), ImageFormat.Jpeg);
imgCroped.Dispose();
 
 
protected static System.Drawing.Image ImageCrop(
    System.Drawing.Image imgPhoto, int Width, int Height,
    AnchorPosition Anchor)
    {
 
        int sourceWidth = imgPhoto.Width;
        int sourceHeight = imgPhoto.Height;
        int sourceX = 0;
        int sourceY = 0;
        int destX = 0;
        int destY = 0;
 
        float nPercent = 0;
        float nPercentW = 0;
        float nPercentH = 0;
 
        nPercentW = ((float)Width / (float)sourceWidth);
        nPercentH = ((float)Height / (float)sourceHeight);
 
        if (nPercentH < nPercentW)
        {
            nPercent = nPercentW;
            switch (Anchor)
            {
                case AnchorPosition.Top:
                    destY = 0;
                    break;
                case AnchorPosition.Bottom:
                    destY = (int)(Height - (sourceHeight * nPercent));
                    break;
                default:
                    destY = (int)((Height - (sourceHeight * nPercent)) / 2);
                    break;
            }
        }
        else
        {
            nPercent = nPercentH;
            switch (Anchor)
            {
                case AnchorPosition.Left:
                    destX = 0;
                    break;
                case AnchorPosition.Right:
                    destX = (int)(Width - (sourceWidth * nPercent));
                    break;
                default:
                    destX = (int)((Width - (sourceWidth * nPercent)) / 2);
                    break;
            }
 
        }
 
        int destWidth = (int)(sourceWidth * nPercent);
        int destHeight = (int)(sourceHeight * nPercent);
 
        Bitmap bmPhoto = new Bitmap(Width, Height,
            PixelFormat.Format24bppRgb);
        bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
            imgPhoto.VerticalResolution);
 
        Graphics grPhoto = Graphics.FromImage(bmPhoto);
        grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;
 
        grPhoto.DrawImage(imgPhoto,
            new Rectangle(destX, destY, destWidth, destHeight),
            new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight),
            GraphicsUnit.Pixel);
 
        grPhoto.Dispose();
        return bmPhoto;
    }

           
         

Attachments:

resize-error.jpg (54 KB) (File Type Details)

thin black line above resize and recrop image

20090824-EE-VQP-74 - Hierarchy / EE_QW_EXPERT_20070906

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25. TechTiger...3,890

asp.net c# image resize and recrop problem

Asked by applefruit in .NET Framework 1.x, .NET Framework 2.x, Programming for ASP.NET

Tags: asp.net, c#

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