Mine

union totalColors{
	version(v4l2)
		struct {ubyte red, green, blue, grey; }
	else
		struct {ubyte blue, green, red, grey; }
		
	ubyte[4] array;
}

class Statistics{
	Picture picture;
	
	totalColors totals;
	
	totalColors[] rows;
	totalColors[] columns;
	
	totalColors[] focusColumns;
	
	this(Picture picture, uint focusStart, uint focusEnd){
		this.picture = picture;
		
		rows.length = picture.height;
		columns.length = picture.width;
		focusColumns.length = picture.width;
		
		//current subpixel
		uint current = 0;
		bool special;
		with(picture){
			for(uint row = 0; row < height; row++){
				for(uint column = 0; column < width; column++){
				
					special = (row >= focusStart) && (row <= focusEnd);
					
					//Blue subpixel totals
					totals.blue += data[current];
					rows[row].blue += data[current];
					columns[column].blue += data[current];
					if(special)
						focusColumns[column].blue += data[current];
					current++;
					
					//gren subpixel totals
					totals.green += data[current];
					rows[row].green += data[current];
					columns[column].green += data[current];
					if(special)
						focusColumns[column].green += data[current];
					current++;
					
					//Red subpixel totals
					totals.red += data[current];
					rows[row].red += data[current];
					columns[column].red += data[current];
					if(special)
						focusColumns[column].red += data[current];
					current++;
				}
			}
		}