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for find dominant color of image
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| package com.pamarin.api.util; | |
| import java.awt.image.BufferedImage; | |
| import java.util.Collections; | |
| import java.util.HashMap; | |
| import java.util.LinkedList; | |
| import java.util.List; | |
| import java.util.Map; | |
| /** | |
| * @author jittagornp | |
| * | |
| * thank you | |
| * http://stackoverflow.com/questions/10530426/how-can-i-find-dominant-color-of-an-image | |
| */ | |
| public class ImageDominantColor { | |
| public static String getHexColor(BufferedImage image) { | |
| Map<Integer, Integer> colorMap = new HashMap<>(); | |
| int height = image.getHeight(); | |
| int width = image.getWidth(); | |
| for (int i = 0; i < width; i++) { | |
| for (int j = 0; j < height; j++) { | |
| int rgb = image.getRGB(i, j); | |
| if (!isGray(getRGBArr(rgb))) { | |
| Integer counter = colorMap.get(rgb); | |
| if (counter == null) { | |
| counter = 0; | |
| } | |
| colorMap.put(rgb, ++counter); | |
| } | |
| } | |
| } | |
| return getMostCommonColor(colorMap); | |
| } | |
| private static String getMostCommonColor(Map<Integer, Integer> map) { | |
| List<Map.Entry<Integer, Integer>> list = new LinkedList<>(map.entrySet()); | |
| Collections.sort(list, (Map.Entry<Integer, Integer> obj1, Map.Entry<Integer, Integer> obj2) | |
| -> ((Comparable) obj1.getValue()).compareTo(obj2.getValue())); | |
| Map.Entry<Integer, Integer> entry = list.get(list.size() - 1); | |
| int[] rgb = getRGBArr(entry.getKey()); | |
| return "#" + Integer.toHexString(rgb[0]) | |
| + Integer.toHexString(rgb[1]) | |
| + Integer.toHexString(rgb[2]); | |
| } | |
| private static int[] getRGBArr(int pixel) { | |
| int alpha = (pixel >> 24) & 0xff; | |
| int red = (pixel >> 16) & 0xff; | |
| int green = (pixel >> 8) & 0xff; | |
| int blue = (pixel) & 0xff; | |
| return new int[]{red, green, blue}; | |
| } | |
| private static boolean isGray(int[] rgbArr) { | |
| int rgDiff = rgbArr[0] - rgbArr[1]; | |
| int rbDiff = rgbArr[0] - rgbArr[2]; | |
| // Filter out black, white and grays...... (tolerance within 10 pixels) | |
| int tolerance = 10; | |
| if (rgDiff > tolerance || rgDiff < -tolerance) { | |
| if (rbDiff > tolerance || rbDiff < -tolerance) { | |
| return false; | |
| } | |
| } | |
| return true; | |
| } | |
| } |
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big O notation for this?