Converting image into array issues
in
Programming Questions
•
1 year ago
Affects the original image for some reason. Can somebody take a look at this?
- PImage rocks;
PImage rocksBrightened;
int rockBytes[][];
int rockBrights[][];
void setup() {
rocks = loadImage("rocks.jpg");
rocksBrightened = loadImage("notrocks.jpg");
rocks.loadPixels();
int h = rocks.height;
size(rocks.width*2, rocks.height*2);
image(rocks, 0, 0);
rockBytes = new int[rocks.width][rocks.height];
rockBrights = new int[rocks.width][rocks.height];
for (int i = 0; i < rocks.width; i++) {
for (int j = 0; j < rocks.height; j++) {
rockBytes[i][j] = rocks.get(i, j);
}
}
for (int i = 0; i < rocks.width; i++) {
for (int j = 0; j < rocks.height; j++) {
rockBrights[i][j] = rocksBrightened.get(i, j);
}
}
drawHistogram(rocks, computeHistogram (rocks));
brighten(rockBrights);
makeImage(rocksBrightened, rockBrights);
image(rocksBrightened, 0, h);
}
void loadPixelArray(PImage anImage) {
anImage.loadPixels(); //load pixels into pixels[] array
}
int[] computeHistogram (PImage anImage) {
int histogram[] = new int[256];
loadPixelArray(anImage);
int histMax = 0;
for (int x = 0; x < anImage.width; x++) {
for (int y = 0; y < anImage.height; y++ ) {
// Calculate the 1D pixel location
int loc = x + y*anImage.width;
histogram[int(red(anImage.pixels[loc]))]++;
}
}
for (int i = 0; i < histogram.length; i++) {
if (histogram[i] > histMax) {
histMax = histogram[i];
}
}
for (int i = 0; i < histogram.length; i++) {
histogram[i] = histogram[i]*100/histMax;
}
return histogram;
}
void brighten(int anyArray[][]) {
for (int i = 0; i < anyArray.length; i++){
for (int j = 0; j < anyArray[0].length; j++) {
anyArray[i][j] = int(-0.004436*anyArray[i][j]) + int(2.1308*anyArray[i][j]);
}
}
}
void drawHistogram(PImage anImage, int histogram[]) {
noStroke();
fill(0);
rect(anImage.width+1, 0, anImage.width, anImage.height);
for (int i = 0; i < 256; i++) {
stroke(255);
line(anImage.width + i, anImage.height, anImage.width + i, anImage.height - histogram[i]);
}
}
void makeImage(PImage anImage, int imgArray[][]) {
anImage.loadPixels();
for (int i = 0; i < imgArray.length; i++) {
for (int j = 0; j < imgArray[0].length; j++) {
int loc = i + j*imgArray.length;
set(i, j, color(imgArray[i][j]));
}
}
anImage.updatePixels();
}
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