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POList view control displaying distorted images
 

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    <p>I have a problem with the ListView control in a windows forms application. Even if I create a thumbnail image or resize the real one I get distorted images in the list view. The image looks like when you zoom in an image very much. I first thought that the GetThumbnailImage is couseing this but I used a resize code I found here and I have the same result. </p> <p>I also did not found any bug related to list view control so I gues I'm doing something wrong but I just can't figure out what. Here is the code I use:</p> <pre><code>lsvPictures.LargeImageList = m_imagesList; lsvPictures.LargeImageList.ImageSize = new Size(100, 100); lsvPictures.View = View.LargeIcon; lsvPictures.CheckBoxes = true; for (int i = 0; i &lt; ofd.FileNames.Length; i++) { filename = ofd.FileNames[i].ToString(); ListViewItem lvi = new ListViewItem(filename); m_imagesList.Images.Add(ResizeImage(Image.FromFile(filename), 100, 100)); lvi.ImageIndex = i; lsvPictures.Items.Add(lvi); } </code></pre> <p>And this is the function that resizes images:</p> <pre><code>public static System.Drawing.Bitmap ResizeImage(System.Drawing.Image image, int width, int height) { //a holder for the result Bitmap result = new Bitmap(width, height); //use a graphics object to draw the resized image into the bitmap using (Graphics graphics = Graphics.FromImage(result)) { //set the resize quality modes to high quality graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //draw the image into the target bitmap graphics.DrawImage(image, 0, 0, result.Width, result.Height); } //return the resulting bitmap return result; } </code></pre> <p>Thank you! Mosu'</p> <p>I just found the source of the problems:</p> <p><code>m_imagesList.ColorDepth = ColorDepth.Depth16Bit;</code></p> <p>It seams that, as default, the ColorDepth of the ImageList is 8 bit (or 4 bit, but my guess is 8). If I change this to at least 16 bit everything looks very nice. </p> <p>To those with similar problems: I changed my Thumbnail method a lot before I realised that the ListView control is not using the color depth the images were having. I put the result of my method on a PictureBox control and saw that the function was working corectly. Atfer this I googled a lot ... and found that silly ColorDepth property. </p>
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