Question

我想绘制图像的RGB强度图，如3种颜色的正弦波。任何人都可以提出任何想法吗？

Answer 1

每种颜色分量（通常）有256级（8位）。如果图像具有Alpha通道，那么每个像素的整体图像位将为32，否则对于仅RGB的图像，它将为24。

我会在算法上推出这个以获得图像直方图，由你来编写绘图代码。

// Arrays for the histogram data
int histoR[256];  // Array that will hold the counts of how many of each red VALUE the image had
int histoG[256];  // Array that will hold the counts of how many of each green VALUE the image had
int histoB[256];  // Array that will hold the counts of how many of each blue VALUE the image had
int histoA[256];  // Array that will hold the counts of how many of each alpha VALUE the image had

// Zeroize all histogram arrays
for(num = 0 through 255){
    histoR[num] = 0;
    histoG[num] = 0;
    histoB[num] = 0;
    histoA[num] = 0;
}

// Move through all image pixels counting up each time a pixel color value is used
for(x = 0 through image width){
    for(y = 0 through image height){
        histoR[image.pixel(x, y).red]   += 1;
        histoG[image.pixel(x, y).green] += 1;
        histoB[image.pixel(x, y).blue]  += 1;
        histoA[image.pixel(x, y).alpha] += 1;
    }
}

您现在拥有直方图数据，由您来绘制它。请记住，上面只是一个算法描述，而不是实际代码

如何从android中的图像绘制RGB强度图？

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