Question

我想改变我在团结场景中上传的图像的亮度。这是我目前的剧本：

public void AdjustBrightness(string brightness)
    {
        int brightnessInt = Convert.ToInt32(brightness);
        int mappedBrightness = (51 * brightnessInt) / 10 - 255;
        //Make an empty Texture the same same as the original 
        Texture2D bitmapImage = new Texture2D(imgTexture.width, imgTexture.height);

        if (mappedBrightness < -255) mappedBrightness = -255;
        if (mappedBrightness > 255) mappedBrightness = 255;
        Color color;
        for (int i = 0; i < bitmapImage.width; i++)
        {
            for (int j = 0; j < bitmapImage.height; j++)
            {
                color = bitmapImage.GetPixel(i, j);
                int cR = (int)color.r + mappedBrightness;
                int cG = (int)color.g + mappedBrightness;
                int cB = (int)color.b + mappedBrightness;

                if (cR < 0) cR = 0;
                if (cR > 255) cR = 255;

                if (cG < 0) cG = 0;
                if (cG > 255) cG = 255;

                if (cB < 0) cB = 0;
                if (cB > 255) cB = 255;

                bitmapImage.SetPixel(i, j,
    new Color((float)cR, (float)cG, (float)cB));
            }
        }
            //Apply all SetPixel changes
            bitmapImage.Apply();

            //Connect texture to material of GameObject this script is attached to 
            Image.renderer.material.mainTexture = bitmapImage as Texture;
    }

出于某种原因，此脚本将我的图像完全更改为黑色。然后，如果我将值增加到某个点，图像将变为白色。

我在这里正确计算亮度吗？

顺便说一下，我在开始时将亮度值从当前输入值范围映射到0％到100％到-255到255之间，以使用此脚本。这样好吗？也就是说，有一个输入字段可以输入0到100的亮度值，并且使用这个公式，我必须将50％的值映射到-255到255的范围/范围内的50％意味着什么？

Answer 1

这里我稍微修改了你的脚本，尝试30到60％之间它仍然与你的脚本相同的比例只是颜色在0和1之间浮动，你如何做数学它是0黑色或1白色试试这个当你应该得到imgTexture的像素时，你得到你的图像的像素你得到像素的imgTexture我也把alpha放入它只是因为你想使用带有alpha的图片因为它不应该随着亮度而改变

我认为你应该保留Texture2D的第三个副本，这样你每次都可以恢复它

public void AdjustBrightness(string brightness)
    {
        int brightnessInt = Convert.ToInt32(brightness);
        float mappedBrightness = (51 * brightnessInt) / 10 - 255;
        //Make an empty Texture the same same as the original 
        Texture2D bitmapImage = new Texture2D(imgTexture.width, imgTexture.height);

        if (mappedBrightness < -255) mappedBrightness = -255;
        if (mappedBrightness > 255) mappedBrightness = 255;
        Color color;
        for (int i = 0; i < bitmapImage.width; i++)
        {
            for (int j = 0; j < bitmapImage.height; j++)
            {
                color = imgTexture.GetPixel(i, j);
                float cR;
                float cG;
                float cB;
                float cA;
                if(color.a == 1f){
                cR = color.r + (mappedBrightness/255);
                cG = color.g + (mappedBrightness/255);
                cB = color.b + (mappedBrightness/255);
                    cA = color.a;


                if (cR < 0) cR = 0;
                if (cR > 255) cR = 255;

                if (cG < 0) cG = 0;
                if (cG > 255) cG = 255;

                if (cB < 0) cB = 0;
                if (cB > 255) cB = 255;
                }else{
                    cR = color.r;
                    cG = color.g;
                    cB = color.b;
                    cA = color.a;
                }

                bitmapImage.SetPixel(i, j,
                                     new Color(cR, cG, cB,cA));
            }
        }
        //Apply all SetPixel changes
        bitmapImage.Apply();

        //Connect texture to material of GameObject this script is attached to 
        imgTexture = bitmapImage;
    }

Answer 2

我假设您正在使用this Color class。它的成员既不是float也不是int，而是byte从0到255。

我认为当您改变亮度时，您应该缩放 r，g和b相同的因素，而不是向他们添加相同的项目。试试这段代码：

public void AdjustBrightness(string brightnessString)
{
    float brightnessInput = Convert.ToFloat(brightnessString);
    if (brightnessInput < 0) brightnessInput = 0;
    if (brightnessInput > 100) brightnessInput = 100;
    float brightnessFactor = (brightnessInput/50.)*(brightnessInput/50.);
    //Make an empty Texture the same same as the original 
    Texture2D bitmapImage = new Texture2D(imgTexture.width, imgTexture.height);

    Color color;
    for (int i = 0; i < bitmapImage.width; i++)
    {
        for (int j = 0; j < bitmapImage.height; j++)
        {
            color = bitmapImage.GetPixel(i, j);
            int cR = int(color.r * brightnessFactor);
            int cG = int(color.g * brightnessFactor);
            int cB = int(color.b * brightnessFactor);

            if (cR > 255) cR = 255;

            if (cG > 255) cG = 255;

            if (cB > 255) cB = 255;

            bitmapImage.SetPixel(i, j, Color.FromArgb(cR, cG, cB));
        }
    }
        //Apply all SetPixel changes
        bitmapImage.Apply();

        //Connect texture to material of GameObject this script is attached to 
        Image.renderer.material.mainTexture = bitmapImage as Texture;
}

使用FromArgb()保存必须进行投射。

此外，使用.SetPixel()非常慢。有关更快速推送像素的方法，请参阅http://www.codeproject.com/Articles/617613/Fast-pixel-operations-in-NET-with-and-without-unsa。

亮度脚本使图像完全黑白

2 个答案: