显示一个图像中的控制台应用程序 [英] Display a Image in a console application

问题描述

我有一个管理图像的控制台应用程序。现在，我需要这样的东西控制台应用程序内的图像的preVIEW。有没有在控制台中显示它们的方法？

I have a console application that manages images. Now i need something like a preview of the Images within the console application. Is there a way to display them in the console?

下面是当前字符基于答案的比较

Here is a comparison of the current character based answers:

输入：

输出：

推荐答案

我还从@DieterMeemken code播放。我一半的垂直分辨率并增加通过░▒▓抖动。左边是迪特Meemken结果，在右边我。在底部是调整到输出rougly匹配原始图片。

虽然Malwyns转换功能是IM pressive，它不使用所有的灰色，有什么可惜的。

I further played with code from @DieterMeemken. I halved vertical resolution and added dithering via ░▒▓. On the left is Dieter Meemken result, on the right my. On the bottom is original picture resized to rougly match the output. While Malwyns conversion function is impressive, it does not use all gray colors, what is pity.

static int[] cColors = { 0x000000, 0x000080, 0x008000, 0x008080, 0x800000, 0x800080, 0x808000, 0xC0C0C0, 0x808080, 0x0000FF, 0x00FF00, 0x00FFFF, 0xFF0000, 0xFF00FF, 0xFFFF00, 0xFFFFFF };

public static void ConsoleWritePixel(Color cValue)
{
    Color[] cTable = cColors.Select(x => Color.FromArgb(x)).ToArray();
    char[] rList = new char[] { (char)9617, (char)9618, (char)9619, (char)9608 }; // 1/4, 2/4, 3/4, 4/4
    int[] bestHit = new int[] { 0, 0, 4, int.MaxValue }; //ForeColor, BackColor, Symbol, Score

    for (int rChar = rList.Length; rChar > 0; rChar--)
    {
        for (int cFore = 0; cFore < cTable.Length; cFore++)
        {
            for (int cBack = 0; cBack < cTable.Length; cBack++)
            {
                int R = (cTable[cFore].R * rChar + cTable[cBack].R * (rList.Length - rChar)) / rList.Length;
                int G = (cTable[cFore].G * rChar + cTable[cBack].G * (rList.Length - rChar)) / rList.Length;
                int B = (cTable[cFore].B * rChar + cTable[cBack].B * (rList.Length - rChar)) / rList.Length;
                int iScore = (cValue.R - R) * (cValue.R - R) + (cValue.G - G) * (cValue.G - G) + (cValue.B - B) * (cValue.B - B);
                if (!(rChar > 1 && rChar < 4 && iScore > 50000)) // rule out too weird combinations
                {
                    if (iScore < bestHit[3])
                    {
                        bestHit[3] = iScore; //Score
                        bestHit[0] = cFore;  //ForeColor
                        bestHit[1] = cBack;  //BackColor
                        bestHit[2] = rChar;  //Symbol
                    }
                }
            }
        }
    }
    Console.ForegroundColor = (ConsoleColor)bestHit[0];
    Console.BackgroundColor = (ConsoleColor)bestHit[1];
    Console.Write(rList[bestHit[2] - 1]);
}


public static void ConsoleWriteImage(Bitmap source)
{
    int sMax = 39;
    decimal percent = Math.Min(decimal.Divide(sMax, source.Width), decimal.Divide(sMax, source.Height));
    Size dSize = new Size((int)(source.Width * percent), (int)(source.Height * percent));   
    Bitmap bmpMax = new Bitmap(source, dSize.Width * 2, dSize.Height);
    for (int i = 0; i < dSize.Height; i++)
    {
        for (int j = 0; j < dSize.Width; j++)
        {
            ConsoleWritePixel(bmpMax.GetPixel(j * 2, i));
            ConsoleWritePixel(bmpMax.GetPixel(j * 2 + 1, i));
        }
        System.Console.WriteLine();
    }
    Console.ResetColor();
}

用法：

Bitmap bmpSrc = new Bitmap(@"HuwnC.gif", true);    
ConsoleWriteImage(bmpSrc);

修改

颜色距离是复杂的课题（<一个href=\"http://stackoverflow.com/questions/1313/followup-finding-an-accurate-distance-between-colors\">here, <一href=\"http://stackoverflow.com/questions/5392061/algorithm-to-check-similarity-of-colors-based-on-rgb-values-or-maybe-hsv\">here而在这些网页链接...）。我试图计算YUV距离和结果，而不是RGB更糟。他们可能是用实验室和更好的DeltaE，但我没有尝试。在RGB的距离似乎不够好。事实上结果为欧几里德和RGB色彩空间曼哈顿距离很simmilar，所以我怀疑有太多几种颜色可供选择。

Color distance is complex topic (here, here and links on those pages...). I tried to calculate distance in YUV and results were rather worse than in RGB. They could be better with Lab and DeltaE, but I did not try that. Distance in RGB seems to be good enough. In fact results are very simmilar for both euclidean and manhattan distance in RGB color space, so I suspect there are just too few colors to choose from.

剩下的就是颜色比较的颜色和图案（=符号）所有组合只是蛮力。我说填充率为░▒▓█是1/4，2/4，3/4和4/4。在这种情况下，第三符号是实际上冗余到第一。但是，如果比率不统一等（取决于字体），结果可能会改变，所以我离开那里为今后的改进。符号的平均颜色计算为按foregroudColor和的backgroundColor填补比例的加权平均值。它假设线性颜色，什么也大大简化。所以还是有改进的余地。

The rest is just brute force compare of color against all combinations of colors and patterns (=symbols). I stated fill ratio for ░▒▓█ to be 1/4, 2/4, 3/4 and 4/4. In that case the third symbol is in fact redundant to the first. But if ratios were not such uniform (depends on font), results could change, so I left it there for future improvements. Average color of symbol is calculated as weighed average of foregroudColor and backgroundColor according to fill ratio. It assumes linear colors, what is also big simplification. So there is still room for improvement.

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