問題描述

我是位圖的新手，每像素使用 16 位Format16bppRgb555；

I am new in working with Bitmap and using 16 bits per pixel Format16bppRgb555;

我想從位圖數(shù)據(jù)中提取 RGB 值.這是我的代碼

I want to Extract RGB Values from Bitmap Data. Here is my code

static void Main(string[] args)
    {

        BitmapRGBValues();
        Console.ReadKey();
    }


 static unsafe void BitmapRGBValues()
    {

        Bitmap cur = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format16bppRgb555);
        //Capture Screen
        var screenBounds = Screen.PrimaryScreen.Bounds;
        using (var gfxScreenshot = Graphics.FromImage(cur))
        {
            gfxScreenshot.CopyFromScreen(screenBounds.X, screenBounds.Y, 0, 0, screenBounds.Size, CopyPixelOperation.SourceCopy);
        }

        var curBitmapData = cur.LockBits(new Rectangle(0, 0, cur.Width, cur.Height),
                                 ImageLockMode.ReadWrite, PixelFormat.Format16bppRgb555);


        try
        {
            byte* scan0 = (byte*)curBitmapData.Scan0.ToPointer();

            for (int y = 0; y < cur.Height; ++y)
            {
                ulong* curRow = (ulong*)(scan0 + curBitmapData.Stride * y);

                for (int x = 0; x < curBitmapData.Stride / 8; ++x)
                {

                    ulong pixel = curRow[x];

                    //How to get RGB Values  from pixel;







                }

            }


        }
        catch
        {

        }
        finally
        {
            cur.UnlockBits(curBitmapData);

        }


    }

推薦答案

LockBits 實(shí)際上可以轉(zhuǎn)換您的圖像到所需的像素格式，這意味著不需要進(jìn)一步轉(zhuǎn)換.只需將圖像鎖定為 Format32bppArgb，您就可以簡(jiǎn)單地從單個(gè)字節(jié)中獲取顏色值.

LockBits can actually convert your image to a desired pixel format, meaning no further conversion should be needed. Just lock the image as Format32bppArgb and you can simply take your colour values from single bytes.

BitmapData curBitmapData = cur.LockBits(new Rectangle(0, 0, cur.Width, cur.Height),
    ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
Int32 stride = curBitmapData.Stride;
Byte[] data = new Byte[stride * cur.Height];
Marshal.Copy(curBitmapData.Scan0, data, 0, data.Length);
cur.UnlockBits(curBitmapData);

使用此代碼，您最終會(huì)得到字節(jié)數(shù)組 data，其中填充了 ARGB 格式的圖像數(shù)據(jù)，這意味著顏色分量字節(jié)將按 [B, G, R, A].請(qǐng)注意，stride 是跳轉(zhuǎn)到圖像下一行的字節(jié)數(shù)，因?yàn)檫@不總是等于width * bytes per pixel"，應(yīng)始終予以考慮.

With this code, you end up with the byte array data, which is filled with your image data in ARGB format, meaning the colour component bytes will be in there in the order [B, G, R, A]. Note that the stride is the amount of bytes to skip to get to a next line on the image, and since this is not always equal to "width * bytes per pixel", it should always be taken into account.

現(xiàn)在你明白了，你可以用它做任何你想做的事......

Now you got that, you can do whatever you want with it...

Int32 curRowOffs = 0;
for (Int32 y = 0; y < cur.Height; y++)
{
    // Set offset to start of current row
    Int32 curOffs = curRowOffs;
    for (Int32 x = 0; x < cur.Width; x++)
    {
        // ARGB = bytes [B,G,R,A]
        Byte b = data[curOffs];
        Byte g = data[curOffs + 1];
        Byte r = data[curOffs + 2];
        Byte a = data[curOffs + 3];
        Color col = Color.FromArgb(a, r, g, b);

        // Do whatever you want with your colour here
        // ...

        // Increase offset to next colour
        curOffs += 4;
    }
    // Increase row offset
    curRowOffs += stride;
}

您甚至可以編輯字節(jié)，然后根據(jù)需要根據(jù)它們構(gòu)建新圖像.

You can even edit the bytes, and then build a new image from them if you want.

這篇關(guān)于c# 位圖數(shù)據(jù)中的 RGB 值的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！