Brightness

Brightness

(Topics->ImageProcessing->Brightness)

マウスを動かすことで妖しい輝きを放ちます。

/** * Brightness

* by Daniel Shiffman.

*

* Adjusts the brightness of part of the image

* Pixels closer to the mouse will appear brighter.

*/

PImage img;

void setup() {

size(200, 200);

frameRate(30);

img = loadImage("wires.jpg");

img.loadPixels();

// Only need to load the pixels[] array once, because we're only

// manipulating pixels[] inside draw(), not drawing shapes.

loadPixels(); //この関数でpixels[]配列に画素を読み込むことができます

}

void draw() {

for (int x = 0; x < img.width; x++) {

for (int y = 0; y < img.height; y++ ) {

// Calculate the 1D location from a 2D grid

int loc = x + y*img.width; //ここで画素のサイズから配列上のアドレスを算出してます

// Get the R,G,B values from image

float r,g,b;

r = red (img.pixels[loc]); //locで好きな位置の画素を参照。red()で赤成分のみ抽出

//g = green (img.pixels[loc]);

//b = blue (img.pixels[loc]);

// Calculate an amount to change brightness based on proximity to the mouse

float maxdist = 50;//dist(0,0,width,height); //ここで明かりの強さを変えられます

float d = dist(x,y,mouseX,mouseY); //マウスと現在の点のユークリッド距離を算出

float adjustbrightness = 255*(maxdist-d)/maxdist;

r += adjustbrightness;

//g += adjustbrightness;

//b += adjustbrightness;

// Constrain RGB to make sure they are within 0-255 color range

// RGB値を最終的に0-255に制限しなければなりません

r = constrain(r,0,255);

//g = constrain(g,0,255);

//b = constrain(b,0,255);

// Make a new color and set pixel in the window

//color c = color(r,g,b);

color c = color(r);

pixels[y*width + x] = c; //ピクセルの値を算出した値に置き換えます

}

}

updatePixels(); //この関数でpixels[]から画像への更新が行われます

}