Question

How to modify a color image to remove lightness factor from an image. Using visual studio c++ code.

What are possible applications of what you have done, and why we might need to remove luminosity channel from the image.

Answer 1

IVsUIShell5 shell5; Button button = new Button(); button.BackColor = GetThemedGDIColor(shell5, SolutionExplorerColors.SelectedItemBrushKey); button.ForeColor = GetThemedGDIColor(shell5, SolutionExplorerColors.SelectedItemTextBrushKey); /// <summary> /// Gets a System.Drawing.Color value from the current theme for the given color key. /// </summary> /// <param name="vsUIShell">The IVsUIShell5 service, used to get the color's value.</param> /// <param name="themeResourceKey">The key to find the color for.</param> /// <returns>The current theme's value of the named color.</returns> public static System.Drawing.Color GetThemedGDIColor(this IVsUIShell5 vsUIShell, ThemeResourceKey themeResourceKey) { Validate.IsNotNull(vsUIShell, "vsUIShell"); Validate.IsNotNull(themeResourceKey, "themeResourceKey"); byte[] colorComponents = GetThemedColorRgba(vsUIShell, themeResourceKey); // Note: The Win32 color we get back from IVsUIShell5.GetThemedColor is ABGR return System.Drawing.Color.FromArgb(colorComponents[3], colorComponents[0], colorComponents[1], colorComponents[2]); } private static byte[] GetThemedColorRgba(IVsUIShell5 vsUIShell, ThemeResourceKey themeResourceKey) { Guid category = themeResourceKey.Category; __THEMEDCOLORTYPE colorType = __THEMEDCOLORTYPE.TCT_Foreground if (themeResourceKey.KeyType == ThemeResourceKeyType.BackgroundColor || themeResourceKey.KeyType == ThemeResourceKeyType.BackgroundBrush) { colorType = __THEMEDCOLORTYPE.TCT_Background; } // This call will throw an exception if the color is not found uint rgbaColor = vsUIShell.GetThemedColor(ref category, themeResourceKey.Name, (uint)colorType); return BitConverter.GetBytes(rgbaColor); } public static System.Windows.Media.Color GetThemedWPFColor(this IVsUIShell5 vsUIShell, ThemeResourceKey themeResourceKey) { Validate.IsNotNull(vsUIShell, "vsUIShell"); Validate.IsNotNull(themeResourceKey, "themeResourceKey"); byte[] colorComponents = GetThemedColorComponents(vsUIShell, themeResourceKey); return System.Windows.Media.Color.FromArgb(colorComponents[3], colorComponents[0], colorComponents[1], colorComponents[2]);