Question

我正在尝试在图像上添加水印，这是我用于截屏的代码。有人可以教我如何在图像中实现水印吗？我想要在图片的右上角有一个小徽标。

我正在尝试研究是否可以实现拍摄快照时在画布上保留的内容（真实生活）。但是，没有运气。如果有人可以在这里帮助我，我将不胜感激！

public string MakePhoto(bool openIt)
{          
    int resWidth = Screen.width;
    int resHeight = Screen.height;

    Texture2D screenShot = new Texture2D(resWidth, resHeight, TextureFormat.RGB24, false); //Create new texture
    RenderTexture rt = new RenderTexture(resWidth, resHeight, 24);        

    // hide the info-text, if any
    if (infoText) 
    {
        infoText.text = string.Empty;
    }
    // render background and foreground cameras
    if (backroundCamera && backroundCamera.enabled) 
    {
        backroundCamera.targetTexture = rt;
        backroundCamera.Render();
        backroundCamera.targetTexture = null;
    }

    if (backroundCamera2 && backroundCamera2.enabled) 
    {
        backroundCamera2.targetTexture = rt;
        backroundCamera2.Render();
        backroundCamera2.targetTexture = null;
    }

    if (foreroundCamera && foreroundCamera.enabled) 
    {
        foreroundCamera.targetTexture = rt;
        foreroundCamera.Render();
        foreroundCamera.targetTexture = null;
    }

    // get the screenshot
    RenderTexture prevActiveTex = RenderTexture.active;
    RenderTexture.active = rt;

    screenShot.ReadPixels(new Rect(0, 0, resWidth, resHeight), 0, 0);

    // clean-up
    RenderTexture.active = prevActiveTex;
    Destroy(rt);

    byte[] btScreenShot = screenShot.EncodeToJPG();
    Destroy(screenShot);

    #if !UNITY_WSA
    // save the screenshot as jpeg file
    string sDirName = Application.persistentDataPath + "/Screenshots";
    if (!Directory.Exists(sDirName))
        Directory.CreateDirectory (sDirName);

    string sFileName = sDirName + "/" + string.Format ("{0:F0}", Time.realtimeSinceStartup * 10f) + ".jpg";
    File.WriteAllBytes(sFileName, btScreenShot);

    Debug.Log("Photo saved to: " + sFileName);
    if (infoText) 
    {
        infoText.text = "Saved to: " + sFileName;
    }

    // open file
    if(openIt)
    {
        System.Diagnostics.Process.Start(sFileName);
    }

    return sFileName;

PS：我发现这可能有用吗？

public Texture2D AddWatermark(Texture2D background, Texture2D watermark)
{

    int startX = 0;
    int startY = background.height - watermark.height;

    for (int x = startX; x < background.width; x++)
    {

        for (int y = startY; y < background.height; y++)
        {
            Color bgColor = background.GetPixel(x, y);
            Color wmColor = watermark.GetPixel(x - startX, y - startY);

            Color final_color = Color.Lerp(bgColor, wmColor, wmColor.a / 1.0f);

            background.SetPixel(x, y, final_color);
        }
    }

    background.Apply();
    return background;
}

Answer 1

在ProjectsView中选择导入的图像，然后在检查器中将TextureType设置为Sprite (2D and UI)（请参阅Sprites Manual），然后点击 Apply
为您的班级添加一个Sprite字段，例如
```
public Sprite whatermark;
```
在检查器中引用精灵

您可以通过在两个纹理中为每个像素添加Color值来简单地将whatermark添加为叠加层（假定此处的大小相同！）

如果仅在纹理的衬色区域中要使用标记，则必须对其进行相应缩放并使用Texture2D.SetPixels(int x, int y, int blockWidth, int blockHeight, Color[] colors)（这是假设标记图像的像素小于屏幕截图！）喜欢

private static void AddWhaterMark(Texture2D texture, Texture2D whatermarkTexture) { int whatermarkWidth = whatermarkTexture.width; int whatermarkHeight = whatermarkTexture.height; // In Unity differrent to most expectations the pixel corrdinate // 0,0 is not the top-left corner but instead the bottom-left // so since you want the whatermark in the top-right corner do int startx = texture.width - whatermarkWidth; // optionally you could also still leave a border of e.g. 10 pixels by using // int startx = texture.width - whatermarkWidth - 10; // same for the y axis int starty = texture.height - whatermarkHeight; Color[] whatermarkPixels = whatermarkTexture.GetPixels(); // get the texture pixels for the given rect Color[] originalPixels = texture.GetPixels(startx, starty, whatermarkWidth, whatermarkHeight); for(int i = 0; i < whatermarkPixels.Length; i++) { var pixel = whatermarkPixels[i]; // adjust the alpha value of the whatermark pixel.a *= 0.5f; // add whatermark pixel to original pixel originalPixels[i] += pixel; } // write back the changed texture data texture.SetPixels(startx, starty, whatermarkWidth, whatermarkHeight, originalPixels); texture.Apply(); }

称呼它

screenShot.ReadPixels(new Rect(0, 0, resWidth, resHeight), 0, 0); AddWhaterMark(screenShot, whatermark.texture);

屏幕快照后图像上的Unity水印

1 个答案: