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ImgUtil 添加获取图片主色调的方法。

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作用，填充网页空白有用，或者自定义处理图像填充白边。
This commit is contained in:
damon.li 2021-06-02 16:54:00 +08:00
parent 68f73c9e64
commit 1e0a88ffda
2 changed files with 65 additions and 8 deletions
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54
hutool-core/src/main/java/cn/hutool/core/img/ImgUtil.java
View File

@ -43,9 +43,7 @@ import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.*;
/**
* 图片处理工具类：<br>
@ -2002,6 +2000,56 @@ public class ImgUtil {
);
}
/**
* 获取给定图片的主色调，背景填充用
*
* @param image {@link BufferedImage}
* @param rgbFilters 过滤多种颜色
* @return {@link String} #ffffff
*/
public static String getMainColor(BufferedImage image, int[]... rgbFilters) {
int r, g, b;
Map<String, Long> countMap = new HashMap<>();
int width = image.getWidth();
int height = image.getHeight();
int minx = image.getMinX();
int miny = image.getMinY();
for (int i = minx; i < width; i++) {
for (int j = miny; j < height; j++) {
int pixel = image.getRGB(i, j);
r = (pixel & 0xff0000) >> 16;
g = (pixel & 0xff00) >> 8;
b = (pixel & 0xff);
if (rgbFilters != null && rgbFilters.length > 0) {
for (int[] rgbFilter : rgbFilters) {
if (r == rgbFilter[0] && g == rgbFilter[1] && b == rgbFilter[2]) {
break;
}
}
}
countMap.merge(r + "-" + g + "-" + b, 1L, Long::sum);
}
}
String maxColor = null;
long maxCount = 0;
for (Map.Entry<String, Long> entry : countMap.entrySet()) {
String key = entry.getKey();
Long count = entry.getValue();
if (count > maxCount) {
maxColor = key;
maxCount = count;
}
}
String[] splitRgbStr = maxColor.split("-");
String rHex = Integer.toHexString(Integer.valueOf(splitRgbStr[0]));
String gHex = Integer.toHexString(Integer.valueOf(splitRgbStr[1]));
String bHex = Integer.toHexString(Integer.valueOf(splitRgbStr[2]));
rHex = rHex.length() == 1 ? "0" + rHex : rHex;
gHex = gHex.length() == 1 ? "0" + gHex : gHex;
bHex = bHex.length() == 1 ? "0" + bHex : bHex;
return "#" + rHex + gHex + bHex;
}
// ------------------------------------------------------------------------------------------------------ 背景图换算
/**

9
hutool-core/src/test/java/cn/hutool/core/img/ImgUtilTest.java
View File

@ -13,6 +13,8 @@ import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
public class ImgUtilTest {
@ -136,4 +138,11 @@ public class ImgUtilTest {
new File("d:/test/3.jpg"),
new Color(200, 0, 0), 10);
}
@Test
public void getMainColor() throws MalformedURLException {
BufferedImage read = ImgUtil.read(new URL("https://pic2.zhimg.com/v2-94f5552f2b142ff575306850c5bab65d_b.png"));
String mainColor = ImgUtil.getMainColor(read, new int[]{64,84,116});
System.out.println(mainColor);
}
}