## 第1章 圖像處理概念介紹 ### 1、RGBA模型分析 ~~~ RGB:red,green,blue,alpha 色相：物體傳遞的顏色 飽和度：顏色的灰度，從0（灰）-100% ~~~ 亮度：顏色的相對明暗程度 ColorMatrix setRotate() setSaturation() setScale() postConcat() ## 第2章 顏色矩陣變換與實例 圖片中矩陣的作用通常用于初始化顏色矩陣  ## 第3章 像素點分析與實例 1.使用getPixels()方法可獲取圖片的所有點的顏色值，一般采用以下格式：bitmap.getPixels(int[] ,0,width,0,0,width,height)。 參數說明：存放像素值的數組->最開始讀取像素時的偏移量->行距(多少算作一行，一般去width)->(x,y)第一次讀取參數的目標->要讀取像素的長度->要讀取像素的寬度 2.獲取所有點的顏色值后，想對像素點進行操作，則需要一Color。red(color)方法讀取R分量，G、B、Alpha分量類似。此處的color為之前存放在數組里的顏色值 3.處理RGB值之后，還需檢查其是否依舊在(0,255)范圍內 4.使用方法newPx[i] = Color.argb(a, r, g, b);將新的RGB值創造新的顏色值 5.使用bmp.setPixels(newPx, 0, width, 0, 0, width, height);將顏色值應用到圖片上，返回圖片 ~~~ r = Color.red(color); g = Color.green(color); b = Color.blue(color); a = Color.alpha(color); ~~~ 底片 ~~~ r = 255 - r; g = 255 - g; b = 255 - b; ~~~ 老照片 ~~~ 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); ~~~ 浮雕 ~~~ r = (r - r1 + 127); g = (g - g1 + 127); b = (b - b1 + 127); ~~~ ## ImageHelper工具類 ~~~ public class ImageHelper { public static Bitmap handleImageEffect(Bitmap bm, float hue, float saturation, float lum) { Bitmap bmp=Bitmap.createBitmap(bm.getWidth(),bm.getHeight(),Bitmap.Config.ARGB_8888); Canvas canvas=new Canvas(bmp); Paint paint=new Paint(Paint.ANTI_ALIAS_FLAG); ColorMatrix hueMatrix=new ColorMatrix(); hueMatrix.setRotate(0,hue); hueMatrix.setRotate(1, hue); hueMatrix.setRotate(2, hue); ColorMatrix saturationMatrix=new ColorMatrix(); saturationMatrix.setSaturation(saturation); ColorMatrix lumMatrix=new ColorMatrix(); lumMatrix.setScale(lum,lum,lum,1); ColorMatrix imageMatrix=new ColorMatrix(); imageMatrix.postConcat(hueMatrix); imageMatrix.postConcat(saturationMatrix); imageMatrix.postConcat(lumMatrix); paint.setColorFilter(new ColorMatrixColorFilter(imageMatrix)); canvas.drawBitmap(bm,0,0,paint); return bmp; } public static Bitmap handleImageNegative(Bitmap bm){ int width = bm.getWidth(); int height = bm.getHeight(); int color; int r, g, b, a; 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, 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); } bmp.setPixels(newPx, 0, width, 0, 0, width, height); return bmp; } public static Bitmap handleImagePixelsoldPhoto(Bitmap bm) { Bitmap bmp = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), Bitmap.Config.ARGB_8888); int width = bm.getWidth(); int height = bm.getHeight(); int color = 0; int r, g, b, a, r1, g1, b1; 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; } public static Bitmap handleImagePixelsRelief(Bitmap bm) { Bitmap bmp = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), Bitmap.Config.ARGB_8888); int width = bm.getWidth(); int height = bm.getHeight(); int color = 0, colorBefore = 0; int a, r, g, b; int r1, g1, b1; 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; } } ~~~