Android绘图机制与处理技巧（二）——Android图像处理之色彩特效处理

package com.huangfei.example; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.ColorFilter; import android.graphics.ColorMatrix; import android.graphics.ColorMatrixColorFilter; import android.graphics.Paint; /** * Created by Administrator on 2016/5/26. * 图像处理工具类 */ public class ImageHelper { /** * 改变图像色光属性 * * @param bm * @param hue 色调 * @param saturation 饱和度 * @param lum 亮度 * @return */ public static Bitmap handleImageEffect(Bitmap bm, float hue, float saturation, float lum) { //设置颜色的色调 ColorMatrix hueMatrix = new ColorMatrix(); //第一个参数，系统分别使用0、1、2来代表Red、Green、Blue三种颜色的处理；而第二个参数，就是需要处理的值 hueMatrix.setRotate(0, hue); hueMatrix.setRotate(1, hue); hueMatrix.setRotate(2, hue); //设置颜色的饱和度 ColorMatrix saturationMatrix = new ColorMatrix(); //saturation参数即代表设置颜色的饱和度的值，当饱和度为0时，图像就变成灰度图像了 saturationMatrix.setSaturation(saturation); //设置颜色的亮度 ColorMatrix lumMatrix = new ColorMatrix(); lumMatrix.setScale(lum, lum, lum, 1); //将矩阵的作用效果混合，从而叠加处理效果 ColorMatrix imageMatrix = new ColorMatrix(); imageMatrix.postConcat(hueMatrix); imageMatrix.postConcat(saturationMatrix); imageMatrix.postConcat(lumMatrix); /** * 设置好处理的颜色矩阵后，通过使用Paint类的setColorFilter()方法，将通过imageMatrix构造的 * ColorMatrixColorFilter对象传递进去，并使用这个画笔来绘制原来的图像，从而将颜色矩阵作用到原图中 */ Paint paint = new Paint(); paint.setColorFilter(new ColorMatrixColorFilter(imageMatrix)); /** * Android系统也不允许直接修改原图，类似Photoshop中的锁定，必须通过原图创建一个同样大小的Bitmap，并将 * 原图绘制到该Bitmap中，以一个副本的形式来修改图像。 */ Bitmap bitmap = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); canvas.drawBitmap(bm, 0, 0, paint); return bitmap; } //底片效果 public static Bitmap handleImageNegative(Bitmap bitmap) { int width = bitmap.getWidth(); int height = bitmap.getHeight(); int color; int r, g, b, a; Bitmap btm = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); int[] oldPx = new int[width * height]; int[] newPx = new int[width * height]; bitmap.getPixels(oldPx, 0, width, 0, 0, width, height); for (int i = 0; i < width * height; i++) { color = oldPx[i]; r = Color.red(color); g = Color.green(color); b = Color.blue(color); a = Color.alpha(color); r = 255 - r; g = 255 - g; b = 255 - b; if (r > 255) r = 255; else if (r < 0) r = 0; if (g > 255) g = 255; else if (g < 0) g = 0; if (b > 255) b = 255; else if (b < 0) b = 0; newPx[i] = Color.argb(a, r, g, b); } btm.setPixels(newPx, 0, width, 0, 0, width, height); return btm; } //老照片效果 public static Bitmap handleImagePixelsOldPhoto(Bitmap bm) { int width = bm.getWidth(); int height = bm.getHeight(); int color; int r, g, b, a, r1, g1, b1; Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); int[] oldPx = new int[width * height]; int[] newPx = new int[width * height]; bm.getPixels(oldPx, 0, bm.getWidth(), 0, 0, width, height); for (int i = 0; i < width * height; i++) { color = oldPx[i]; a = Color.alpha(color); r = Color.red(color); g = Color.green(color); b = Color.blue(color); r1 = (int) (0.393 * r + 0.769 * g + 0.189 * b); g1 = (int) (0.349 * r + 0.686 * g + 0.168 * b); b1 = (int) (0.272 * r + 0.534 * g + 0.131 * b); if (r1 > 255) { r1 = 255; } if (g1 > 255) { g1 = 255; } if (b1 > 255) { b1 = 255; } newPx[i] = Color.argb(a, r1, g1, b1); } bmp.setPixels(newPx, 0, width, 0, 0, width, height); return bmp; } //浮雕效果 public static Bitmap handleImagePixelsRelief(Bitmap bm) { int width = bm.getWidth(); int height = bm.getHeight(); int color, colorBefore; int a, r, g, b; int r1, g1, b1; Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); int[] oldPx = new int[width * height]; int[] newPx = new int[width * height]; bm.getPixels(oldPx, 0, bm.getWidth(), 0, 0, width, height); for (int i = 1; i < width * height; i++) { colorBefore = oldPx[i - 1]; a = Color.alpha(colorBefore); r = Color.red(colorBefore); g = Color.green(colorBefore); b = Color.blue(colorBefore); color = oldPx[i]; r1 = Color.red(color); g1 = Color.green(color); b1 = Color.blue(color); r = r - r1 + 127; g = g - g1 + 127; b = b - b1 + 127; if (r > 255) { r = 255; } if (g > 255) { g = 255; } if (b > 255) { b = 255; } newPx[i] = Color.argb(a, r, g, b); } bmp.setPixels(newPx, 0, width, 0, 0, width, height); return bmp; } }