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缘由

看过上篇文章《OpenCvSharp基于颜色反差规避FBA面单贴标（2）》的都应该有印象这么一行代码：

// 面单颜色列表（十六进制格式）

privatestaticreadonly List<string> LabelColors = new List<string>

{

"#7C7C7C", "#707070", "#5E5E5E", "#8F8F8D", "#5F5F5F", "#CBCBC9","#FFFFFF","#FEFEFE","#FCFCFC" ,"#7B7B7B","#828282","#7D7D7D","#787878","#D7D7D5","#777777","#7F7F7F"

};

每次有不同颜色或者无法定位的面单，都需要人工补录面单的背景色HEX，那么能不能集成一个工具，自动吸取图片色号保存后，这里能立即生效呢？答案是肯定的！先看看动态效果图：

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点击取色，跟随鼠标实时显示背景色便于定位

快捷键Alt+C,抓取当前鼠标所在背景色存储到列表并存储到根目录colorHistory.json文件，便于其他地方读取

列表支持右键删除错误颜色（如下图）

其他地方读取抓取的颜色列表

image

保存的json文件格式如下:

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[

"#018DBE",

"#B1C681",

"#03231E",

"#61CB81",

"#00424A",

"#B5BD68",

"#A3D9A3",

"#F68A1E",

"#0E83BA",

"#861B2D",

"#059BBC"

]

每次抓取都会往json存储当前最新色号，然后其他地方实时读取json即可:

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//// 面单颜色列表（十六进制格式）

//private static readonly List<string> LabelColors = new List<string>

//{

// "#7C7C7C", "#707070", "#5E5E5E", "#8F8F8D", "#5F5F5F", "#CBCBC9","#FFFFFF","#FEFEFE","#FCFCFC" ,"#7B7B7B","#828282","#7D7D7D","#787878","#D7D7D5","#777777","#7F7F7F"

//};

static List<string> LabelColors = new List<string>();

privatestatic List<string> LoadColorList()

{

try

{

string historyFilePath = System.Windows.Forms.Application.StartupPath + @"\colorHistory.json";

if (File.Exists(historyFilePath))

{

string json = File.ReadAllText(historyFilePath);

var hexList = JsonSerializer.Deserialize<List<string>>(json);

foreach (var hex in hexList)

{

if (!string.IsNullOrEmpty(hex))

{

LabelColors.Add(hex);

}

}

return LabelColors;

}

}

catch (Exception ex)

{

MessageBox.Show($"加载历史记录失败: {ex.Message}", "错误",

MessageBoxButtons.OK, MessageBoxIcon.Error);

}

returnnull;

}

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private List<Color> colorHistory = new List<Color>();

private MagnifierForm magnifierForm;

privatestring historyFilePath = "colorHistory.json";

private ContextMenuStrip historyContextMenu;

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// 初始化右键菜单

privatevoidInitializeContextMenu()

{

historyContextMenu = new ContextMenuStrip();

ToolStripMenuItem deleteItem = new ToolStripMenuItem("删除选中颜色");

deleteItem.Click += DeleteItem_Click;

ToolStripMenuItem clearAllItem = new ToolStripMenuItem("清空所有历史");

clearAllItem.Click += ClearAllItem_Click;

ToolStripMenuItem copyItem = new ToolStripMenuItem("复制颜色值");

copyItem.Click += CopyItem_Click;

historyContextMenu.Items.AddRange(new ToolStripItem[] {

copyItem, deleteItem, clearAllItem

});

lstHistory.ContextMenuStrip = historyContextMenu;

LoadColorHistory();

// 设置ListBox为自绘模式

lstHistory.DrawMode = DrawMode.OwnerDrawFixed;

lstHistory.DrawItem += LstHistory_DrawItem;

}

ListBox实时显示当前吸取的背景色，重绘代码如下:

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// 绘制ListBox项

privatevoidLstHistory_DrawItem(object sender, DrawItemEventArgs e)

{

if (e.Index < 0 || e.Index >= colorHistory.Count) return;

e.DrawBackground();

Color color = colorHistory[e.Index];

string text = $"{ColorToHex(color)} - RGB({color.R},{color.G},{color.B})";

// 绘制颜色块

Rectangle colorRect = new Rectangle(e.Bounds.Left + 2, e.Bounds.Top + 2, 20, e.Bounds.Height - 4);

using (SolidBrush brush = new SolidBrush(color))

{

e.Graphics.FillRectangle(brush, colorRect);

}

e.Graphics.DrawRectangle(Pens.Black, colorRect);

// 绘制文本

Rectangle textRect = new Rectangle(e.Bounds.Left + 25, e.Bounds.Top, e.Bounds.Width - 25, e.Bounds.Height);

using (SolidBrush textBrush = new SolidBrush(e.ForeColor))

{

e.Graphics.DrawString(text, e.Font, textBrush, textRect);

}

e.DrawFocusRectangle();

}

RGB和HEX 相互转换

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// HEX字符串转Color

private Color HexToColor(string hex)

{

try

{

// 移除#号

hex = hex.Replace("#", "");

// 处理3位HEX

if (hex.Length == 3)

{

hex = $"{hex[0]}{hex[0]}{hex[1]}{hex[1]}{hex[2]}{hex[2]}";

}

// 处理6位HEX

if (hex.Length == 6)

{

byte r = Convert.ToByte(hex.Substring(0, 2), 16);

byte g = Convert.ToByte(hex.Substring(2, 2), 16);

byte b = Convert.ToByte(hex.Substring(4, 2), 16);

return Color.FromArgb(r, g, b);

}

return Color.Empty;

}

catch

{

return Color.Empty;

}

}

// 颜色转HEX

privatestringColorToHex(Color color)

{

return$"#{color.R:X2}{color.G:X2}{color.B:X2}";

}

结束语

感谢各位耐心查阅！ 如果您有更好的想法欢迎一起交流，有不懂的也可以微信公众号联系博主，作者公众号会经常发一些实用的小工具和demo源码，需要的可以去看看！另外，如果觉得本篇博文对您或者身边朋友有帮助的，麻烦点个