As the title implies just after a bit of info.
Looking through some examples I came across the histogram image sketch which makes use of get to retrieve pixel values.
for (int i = 0; i < img.width; i++) {
for (int j = 0; j < img.height; j++) {
int bright = int(brightness(get(i, j)));
hist[bright]++;
}
}
what is the difference between that and
for (int i = 0; i < img.width; i++) {
for (int j = 0; j < img.height; j++) {
int bright = int(brightness(pixels[i+ j*img.width]));
hist[bright]++;
}
}
other than the fact that pixels require loadPixels.
Just have a look at get(): 
As we can see for ourselves get() does pretty much the same as we’d do by directly accessing pixels[], but w/ more checks; therefore slightly slower. 
Method get() doesn’t invoke loadPixels() either! 
So we should assume it’s needed as much as using pixels[] on our own. 
For best contiguous memory speed access the outer loop gotta be height & the inner 1 be width: 
for (int h = img.height, y = 0; y < h; ++y)
for (int w = img.width, x = 0; x < w; ++x) {
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