素材
圓角處理
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = new RectF(rect); paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; }
實(shí)際就是先畫(huà)了一個(gè)圓角矩形的過(guò)濾框，于是形狀有了，再將框中的內(nèi)容填充為圖片。對(duì)于Mode.SRC_IN的講解
輸出效果：
灰白處理
public static Bitmap toGrayscale(Bitmap bmpOriginal) { int width, height; height = bmpOriginal.getHeight(); width = bmpOriginal.getWidth(); Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); Canvas c = new Canvas(bmpGrayscale); Paint paint = new Paint(); ColorMatrix cm = new ColorMatrix(); cm.setSaturation(0); ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm); paint.setColorFilter(f); c.drawBitmap(bmpOriginal, 0, 0, paint); return bmpGrayscale; }
就是利用了ColorMatrix 類(lèi)自帶的設(shè)置飽和度的方法setSaturation()。不過(guò)其方法內(nèi)部實(shí)現(xiàn)的更深一層是利用顏色矩陣的乘法實(shí)現(xiàn)的。
輸出效果：
黑白處理
public static Bitmap toHeibai(Bitmap mBitmap) { int mBitmapWidth = 0; int mBitmapHeight = 0; mBitmapWidth = mBitmap.getWidth(); mBitmapHeight = mBitmap.getHeight(); Bitmap bmpReturn = Bitmap.createBitmap(mBitmapWidth, mBitmapHeight, Bitmap.Config.ARGB_8888); int iPixel = 0; for (int i = 0; i < mBitmapWidth; i++) { for (int j = 0; j < mBitmapHeight; j++) { int curr_color = mBitmap.getPixel(i, j); int avg = (Color.red(curr_color) + Color.green(curr_color) + Color .blue(curr_color)) / 3; if (avg >= 100) { iPixel = 255; } else { iPixel = 0; } int modif_color = Color.argb(255, iPixel, iPixel, iPixel); bmpReturn.setPixel(i, j, modif_color); } } return bmpReturn; }
闕值變換。其實(shí)看圖片效果就能看出來(lái)，這張圖片不同于灰白處理的那張，不同之處是灰白處理雖然沒(méi)有了顏色，但是黑白的程度層次依然存在，而此張圖片連層次都沒(méi)有了，只有兩個(gè)區(qū)別十分明顯的黑白顏色。實(shí)現(xiàn)的算法也很簡(jiǎn)單，對(duì)于每個(gè)像素的rgb值求平均數(shù)，如果高于100算白色，低于100算黑色。
輸出效果：
鏡像處理
public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) { final int reflectionGap = 4; int width = bitmap.getWidth(); int height = bitmap.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(1, -1); Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2, width, height / 2, matrix, false); Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888); Canvas canvas = new Canvas(bitmapWithReflection); canvas.drawBitmap(bitmap, 0, 0, null); Paint deafalutPaint = new Paint(); canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint); canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null); Paint paint = new Paint(); LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP); paint.setShader(shader); // Set the Transfer mode to be porter duff and destination in paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); // Draw a rectangle using the paint with our linear gradient canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ reflectionGap, paint); return bitmapWithReflection; }
就是將原圖片反轉(zhuǎn)一下，調(diào)整一 下它的顏色作出倒影效果，再將兩張圖片續(xù)加在一起。
輸出效果：
泛黃處理
public static Bitmap testBitmap(Bitmap bitmap) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), Config.RGB_565); Canvas canvas = new Canvas(output); Paint paint = new Paint(); ColorMatrix cm = new ColorMatrix(); float[] array = {1,0,0,0,50, 0,1,0,0,50, 0,0,1,0,0, 0,0,0,1,0}; cm.set(array); paint.setColorFilter(new ColorMatrixColorFilter(cm)); canvas.drawBitmap(bitmap, 0, 0, paint); return output; }
其實(shí)每張圖片的存儲(chǔ)都是存的每個(gè)像素的rgba值，而對(duì)其操作的時(shí)候又將其四個(gè)數(shù)值定位一個(gè)5行1列的矩陣，最后一行值為1，這樣一來(lái)利用矩陣對(duì)其操作確實(shí)方便了好多，矩陣的乘法可以輕松的實(shí)現(xiàn)某個(gè)或全部分量按比例或加常熟的增加或減少。 比如現(xiàn)有一張圖片，其每個(gè)point的rgba值為{100，100，100,255}也就是灰色全圖，我們希望其紅色部位增加一倍，剩余部分增加十。就可以將其值虛擬為五行一列矩陣：{100 ，100,100,255,1} 再讓這個(gè)矩陣：{2,0,0,0,0換行 0,1,0,0,10換行 0,0,1,0,10換行 0,,0,0,1,10} 乘以它。得到{ 200,110,100,100} 。 這個(gè)泛黃照片的處理算法原理就是讓每個(gè)像素點(diǎn)rg值增加50，rg值相混合就得到了黃色。
輸出效果：
哈哈鏡處理
jintArray Java_com_spore_meitu_jni_ImageUtilEngine_toHahajing (JNIEnv* env,jobject thiz, jintArray buf, jint width, jint height,jint centerX, jint centerY, jint radius, jfloat multiple) { jint * cbuf; cbuf = (*env)->GetIntArrayElements(env, buf, 0); int newSize = width * height; jint rbuf[newSize]; float xishu = multiple; int real_radius = (int)(radius / xishu); int i = 0, j = 0; for (i = 0; i < width; i++) { for (j = 0; j < height; j++) { int curr_color = cbuf[j * width + i]; int pixR = red(curr_color); int pixG = green(curr_color); int pixB = blue(curr_color); int pixA = alpha(curr_color); int newR = pixR; int newG = pixG; int newB = pixB; int newA = pixA; int distance = (int) ((centerX - i) * (centerX - i) + (centerY - j) * (centerY - j)); if (distance < radius * radius) { int src_x = (int) ((float) (i - centerX) / xishu); int src_y = (int) ((float) (j - centerY) / xishu); src_x = (int)(src_x * (sqrt(distance) / real_radius)); src_y = (int)(src_y * (sqrt(distance) / real_radius)); src_x = src_x + centerX; src_y = src_y + centerY; int src_color = cbuf[src_y * width + src_x]; newR = red(src_color); newG = green(src_color); newB = blue(src_color); newA = alpha(src_color); } newR = min(255, max(0, newR)); newG = min(255, max(0, newG)); newB = min(255, max(0, newB)); newA = min(255, max(0, newA)); int modif_color = ARGB(newA, newR, newG, newB); rbuf[j * width + i] = modif_color; } } jintArray result = (*env)->NewIntArray(env, newSize); (*env)->SetIntArrayRegion(env, result, 0, newSize, rbuf); (*env)->ReleaseIntArrayElements(env, buf, cbuf, 0); return result; }
根據(jù)哈哈鏡的半徑，以中心點(diǎn)為圓心，每個(gè)像素點(diǎn)的坐標(biāo)位移并擴(kuò)展，離中心點(diǎn)越近的就擴(kuò)展越大。
輸出效果：
放大鏡處理
jintArray Java_com_spore_meitu_jni_ImageUtilEngine_toFangdajing (JNIEnv* env,jobject thiz, jintArray buf, jint width, jint height,jint centerX, jint centerY, jint radius, jfloat multiple) { jint * cbuf; cbuf = (*env)->GetIntArrayElements(env, buf, 0); int newSize = width * height; jint rbuf[newSize]; float xishu = multiple; int real_radius = (int)(radius / xishu); int i = 0, j = 0; for (i = 0; i < width; i++) { for (j = 0; j < height; j++) { int curr_color = cbuf[j * width + i]; int pixR = red(curr_color); int pixG = green(curr_color); int pixB = blue(curr_color); int pixA = alpha(curr_color); int newR = pixR; int newG = pixG; int newB = pixB; int newA = pixA; int distance = (int) ((centerX - i) * (centerX - i) + (centerY - j) * (centerY - j)); if (distance < radius * radius) { int src_x = (int)((float)(i - centerX) / xishu + centerX); int src_y = (int)((float)(j - centerY) / xishu + centerY); int src_color = cbuf[src_y * width + src_x]; newR = red(src_color); newG = green(src_color); newB = blue(src_color); newA = alpha(src_color); } newR = min(255, max(0, newR)); newG = min(255, max(0, newG)); newB = min(255, max(0, newB)); newA = min(255, max(0, newA)); int modif_color = ARGB(newA, newR, newG, newB); rbuf[j * width + i] = modif_color; } } jintArray result = (*env)->NewIntArray(env, newSize); (*env)->SetIntArrayRegion(env, result, 0, newSize, rbuf); (*env)->ReleaseIntArrayElements(env, buf, cbuf, 0); return result; }
浮雕處理
public static Bitmap toFuDiao(Bitmap mBitmap) { int mBitmapWidth = 0; int mBitmapHeight = 0; mBitmapWidth = mBitmap.getWidth(); mBitmapHeight = mBitmap.getHeight(); Bitmap bmpReturn = Bitmap.createBitmap(mBitmapWidth, mBitmapHeight, Bitmap.Config.RGB_565); int preColor = 0; int prepreColor = 0; preColor = mBitmap.getPixel(0, 0); for (int i = 0; i < mBitmapWidth; i++) { for (int j = 0; j < mBitmapHeight; j++) { int curr_color = mBitmap.getPixel(i, j); int r = Color.red(curr_color) - Color.red(prepreColor) +127; int g = Color.green(curr_color) - Color.red(prepreColor) + 127; int b = Color.green(curr_color) - Color.blue(prepreColor) + 127; int a = Color.alpha(curr_color); int modif_color = Color.argb(a, r, g, b); bmpReturn.setPixel(i, j, modif_color); prepreColor = preColor; preColor = curr_color; } } Canvas c = new Canvas(bmpReturn); Paint paint = new Paint(); ColorMatrix cm = new ColorMatrix(); cm.setSaturation(0); ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm); paint.setColorFilter(f); c.drawBitmap(bmpReturn, 0, 0, paint); return bmpReturn; }
其實(shí)浮雕的特點(diǎn)就是在顏色有跳變的地方就刻條痕跡。127，127,127為深灰色，近似于石頭的顏色，此處取該顏色為底色。算法是將上一個(gè)點(diǎn)的rgba值減去當(dāng)前點(diǎn)的rgba值然后加上127得到當(dāng)前點(diǎn)的顏色。
輸出效果：
底片處理
jintArray Java_com_spore_meitu_jni_ImageUtilEngine_toDipian (JNIEnv* env,jobject thiz, jintArray buf, jint width, jint height) { jint * cbuf; cbuf = (*env)->GetIntArrayElements(env, buf, 0); int newSize = width * height; jint rbuf[newSize]; int count = 0; int preColor = 0; int prepreColor = 0; int color = 0; preColor = cbuf[0]; int i = 0; int j = 0; int iPixel = 0; for (i = 0; i < width; i++) { for (j = 0; j < height; j++) { int curr_color = cbuf[j * width + i]; int r = 255 - red(curr_color); int g = 255 - green(curr_color); int b = 255 - blue(curr_color); int a = alpha(curr_color); int modif_color = ARGB(a, r, g, b); rbuf[j * width + i] = modif_color; } } jintArray result = (*env)->NewIntArray(env, newSize); (*env)->SetIntArrayRegion(env, result, 0, newSize, rbuf); (*env)->ReleaseIntArrayElements(env, buf, cbuf, 0); return result; }
輸出效果：
油畫(huà)處理
public static Bitmap toYouHua(Bitmap bmpSource) { Bitmap bmpReturn = Bitmap.createBitmap(bmpSource.getWidth(), bmpSource.getHeight(), Bitmap.Config.RGB_565); int color = 0; int Radio = 0; int width = bmpSource.getWidth(); int height = bmpSource.getHeight(); Random rnd = new Random(); int iModel = 10; int i = width - iModel; while (i > 1) { int j = height - iModel; while (j > 1) { int iPos = rnd.nextInt(100000) % iModel; color = bmpSource.getPixel(i + iPos, j + iPos); bmpReturn.setPixel(i, j, color); j = j - 1; } i = i - 1; } return bmpReturn; }
油畫(huà)因?yàn)槭怯卯?huà)筆畫(huà)的，彩筆畫(huà)的時(shí)候沒(méi)有那么精確會(huì)將本該這點(diǎn)的顏色滑到另一個(gè)點(diǎn)處。算法實(shí)現(xiàn)就是取一個(gè)一定范圍內(nèi)的隨機(jī)數(shù)，每個(gè)點(diǎn)的顏色是該點(diǎn)減去隨機(jī)數(shù)坐標(biāo)后所得坐標(biāo)的顏色。
輸出效果：
模糊
public static Bitmap toMohu(Bitmap bmpSource, int Blur) { int mode = 5; Bitmap bmpReturn = Bitmap.createBitmap(bmpSource.getWidth(), bmpSource.getHeight(), Bitmap.Config.ARGB_8888); int pixels[] = new int[bmpSource.getWidth() \* bmpSource.getHeight()]; int pixelsRawSource[] = new int[bmpSource.getWidth()\* bmpSource.getHeight() \* 3]; int pixelsRawNew[] = new int[bmpSource.getWidth()\* bmpSource.getHeight() \* 3]; bmpSource.getPixels(pixels, 0, bmpSource.getWidth(), 0, 0, bmpSource.getWidth(), bmpSource.getHeight()); for (int k = 1; k <= Blur; k++) { for (int i = 0; i < pixels.length; i++) { pixelsRawSource[i \* 3 + 0] = Color.red(pixels[i]); pixelsRawSource[i \* 3 + 1] = Color.green(pixels[i]); pixelsRawSource[i \* 3 + 2] = Color.blue(pixels[i]); } int CurrentPixel = bmpSource.getWidth() \* 3 + 3; for (int i = 0; i < bmpSource.getHeight() - 3; i++) { for (int j = 0; j < bmpSource.getWidth() \* 3; j++) { CurrentPixel += 1; int sumColor = 0; sumColor = pixelsRawSource[CurrentPixel- bmpSource.getWidth() \* 3]; sumColor = sumColor + pixelsRawSource[CurrentPixel - 3]; sumColor = sumColor + pixelsRawSource[CurrentPixel + 3]; sumColor = sumColor+ pixelsRawSource[CurrentPixel+ bmpSource.getWidth() \* 3]; pixelsRawNew[CurrentPixel] = Math.round(sumColor / 4); } } for (int i = 0; i < pixels.length; i++) { pixels[i] = Color.rgb(pixelsRawNew[i \* 3 + 0], pixelsRawNew[i \* 3 + 1], pixelsRawNew[i \* 3 + 2]); } } bmpReturn.setPixels(pixels, 0, bmpSource.getWidth(), 0, 0, bmpSource.getWidth(), bmpSource.getHeight()); return bmpReturn; }
取每三點(diǎn)的平均值做為當(dāng)前點(diǎn)顏色。真正的高斯模糊應(yīng)該取周?chē)c(diǎn)點(diǎn)加權(quán)平均，而且權(quán)重符合正態(tài)分布。不過(guò)處理速度實(shí)在是太慢了，對(duì)于及時(shí)性較強(qiáng)的高斯模糊應(yīng)該是用opengl著色實(shí)現(xiàn)渲染。
輸出效果：
注：以上算法并非全部原創(chuàng)，但是很早以前接觸的，實(shí)在找不到出處了，致歉。
