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Icon transparency fails in ListViews etc.

Hi,I have a question aboutIcons display in windows forms. Trying to get it right in a collegues application, since i'm responsible for graphics...

We are using the same PNG 24 bit icon with transparency in a listview as well as directly on an ordinary form. They display differently.

Example:

http://www.wilfing.se/forum/bells.png

In the listview it looks like the left one, adding some kind of blue stroke where it should be partlytransparent, whilst the othere one added right on a form renders correctly without any blue stroke...

This only fails in Windows XP!! Please help me out! I would be very greatful..

(VB .NET 3.5, VS 2008) Thanks/Jesper

AdmiralGanja Friday, November 28, 2008 7:37 AM

Hi AdmiralGanja,

I don’t know how you set the icon of the ListView items. I think this problem might be caused by the ColorDepth. Here is my code to set the icon of the three items in my test ListView.

Code Snippet

partial class Form1 : Form

{

private ImageList imgList = new ImageList();

public Form1()

{

InitializeComponent();

Image img = Image.FromFile(@"D:\icon.bmp");

imgList.Images.Add(img);

imgList.ImageSize = new Size(100, 100);

imgList.ColorDepth = ColorDepth.Depth32Bit;

listView1.LargeImageList = imgList;

listView1.Items[0].ImageIndex = 0;

listView1.Items[1].ImageIndex = 0;

listView1.Items[2].ImageIndex = 0;

}

When I set the ColorDepth property of the ImageList to Depth32Bit, it looks greate event the size is very big (100X100). But system will use Depth8Bit as default value if you don’t set it. Then the icon looks really ugly when it is larger.

Please try that and tell me if it works.

Sincerely,

Kira Qian

Kira Qian Monday, December 01, 2008 7:42 AM