最近需要完成一个在j2me上面实现图片的特效 （缩放，裁剪，调整大小，镜像，对比度亮度调整，黑白，线条，粉笔画,蒙版）等功能，于是写了一些算法完成了以上功能，系统条件：MIDP2.0，cldc1.1 代码如下：ImageUtil /* * ImageUtil.java * * Created on 2008年1月11日, 上午9:26 * *//** * * @author alajl */import javax.microedition.lcdui.*;import javax.microedition.lcdui.game.Sprite;public class ImageUtil{ public static final int TURN_LEFT = 1; public static final int TURN_RIGHT = 2; /* *获取图片RGB数据，并返回大小为width*height大小的一维数组 */ public int[] getPixels(Image src) { int w = src.getWidth(); int h = src.getHeight(); int[] pixels = new int[w * h]; src.getRGB(pixels, 0, w, 0, 0, w, h); return pixels; } /* *将pixels[]里的数据，生成一张图片，图片宽为w，高为h */ public Image drawPixels(int[] pixels, int w, int h) { Image image = Image.createRGBImage(pixels, w, h, true); pixels = null; return image; } /* *调整图片大小 *destW 调整后的宽，destH调整后的高 */ public Image effect_resizeImage(Image src, int destW, int destH) { int srcW = src.getWidth(); int srcH = src.getHeight(); int[] destPixels = new int[destW * destH]; int[] srcPixels = getPixels(src); for (int destY = 0; destY < destH; ++destY) { for (int destX = 0; destX < destW; ++destX) { int srcX = (destX * srcW) / destW; int srcY = (destY * srcH) / destH; destPixels[destX + destY * destW] = srcPixels[srcX + srcY * srcW]; } } return drawPixels(destPixels, destW, destH); } /* * 调整图片亮度与对比度。 contrast 对比度，light 亮度 */ public Image effect_light_contrast(Image src,double contrast,int light) { int srcW = src.getWidth(); int srcH = src.getHeight(); int[] srcPixels = getPixels(src); int r = 0; int g = 0; int b = 0; int a = 0; int argb; //公式y =ax+b a为对比度，b为亮度 //int para_b = light - 127 * (light - 1); for (int i = 0; i < srcH; i++) { for(int ii=0;ii<srcW;ii++) { argb = srcPixels[i*srcW+ii]; a = ((argb & 0xff000000) >> 24); // alpha channel r =((argb & 0x00ff0000) >> 16); // red channel g =((argb & 0x0000ff00) >> 8); // green channel b =(argb & 0x000000ff); // blue channel r =(int)( r*contrast+light); g =(int)( g*contrast+light); b =(int)( b*contrast+light); /*r =(int)((r -127 ) * contrast + 127+para_b); g =(int)((g -127 ) * contrast + 127+para_b); b =(int)((b -127 ) * contrast + 127+para_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; srcPixels[i*srcW+ii] = ((a << 24) | (r << 16) | (g << 8) | b); } } return drawPixels(srcPixels, srcW, srcH); } /* * 图片镜像特效 */ public Image effect_mirror(Image src) { int srcW = src.getWidth(); int srcH = src.getHeight(); int[] srcPixels = getPixels(src); int len; int temp; for (int i = 0; i < srcH; i++) { len = (i+1)*srcW; for(int ii=0;ii<srcW/2;ii++) { temp=srcPixels[i*srcW+ii]; srcPixels[i*srcW+ii]=srcPixels[len-1-ii]; srcPixels[len-1-ii]=temp; } } return drawPixels(srcPixels, srcW, srcH); } /* * 图片剪切，cut_xpos，cut_ypos 切割框的起始位置坐标，cut_width，cut_height 切割框的宽与高 */ public Image effect_cut(Image src,int cut_xpos,int cut_ypos,int cut_width,int cut_height) { int srcW = src.getWidth(); int srcH = src.getHeight(); int[] srcPixels = getPixels(src); int[] desPixels = new int[cut_width*cut_height]; int argb; int num = 0; for (int i = 0; i < srcH; i++) { if(i >= cut_ypos&&i<cut_height+cut_ypos) { for(int ii=0;ii<srcW;ii++) { if(ii>=cut_xpos && ii<cut_width+cut_xpos) { desPixels[num] = srcPixels[i*srcW+ii]; num++; } } } } return drawPixels(desPixels, cut_width, cut_height); } /* * 图片叠加，将src和image合成一张图片，x_pos，y_pos一般为0,0,也可以为自定义值 */ public Image effect_image_add_image(Image src,Image image,int x_pos,int y_pos) { Image temp = Image.createImage(src.getWidth(),src.getHeight()); Graphics g = temp.getGraphics(); //g.drawImage(src,x_pos,y_pos,Graphics.LEFT|Graphics.TOP); //g.drawImage(image,x_pos,y_pos,Graphics.LEFT|Graphics.TOP);*/ int alpha = 168; int []srcRgbdata = new int[src.getWidth()*src.getHeight()]; int []desRgbdata = new int[image.getWidth()*image.getHeight()]; src.getRGB(srcRgbdata,0,src.getWidth(),0,0,src.getWidth(),src.getHeight()); image.getRGB(desRgbdata,0,image.getWidth(),0,0,image.getWidth(),image.getHeight()); g.drawRGB(getTransImg(alpha,srcRgbdata,desRgbdata),0,src.getWidth(),0,0,src.getWidth(),src.getHeight(),false); src=null; image=null; return temp; } /* * 图片上添加字符 */ public Image effect_image_add_str(Image src,String str,int x_pos,int y_pos) { Image temp = Image.createImage(src.getWidth(),src.getHeight()); Graphics g = temp.getGraphics(); g.drawImage(src,0,0,Graphics.LEFT|Graphics.TOP); g.setColor(0x000000); g.drawString(str,x_pos,y_pos,Graphics.LEFT|Graphics.TOP); return temp; } /* * 图片特效负片 */ public Image effect_negative(Image src) { int srcW = src.getWidth(); int srcH = src.getHeight(); int[] srcPixels = getPixels(src); int r = 0; int g = 0; int b = 0; int a = 0; int argb; for (int i = 0; i < srcH; i++) { for(int ii=0;ii<srcW;ii++) { argb = srcPixels[i*srcW+ii]; a = ((argb & 0xff000000) >> 24); // alpha channel r =255-((argb & 0x00ff0000) >> 16); // red channel g =255-((argb & 0x0000ff00) >> 8); // green channel b =255-(argb & 0x000000ff); // blue channel srcPixels[i*srcW+ii] = ((a << 24) | (r << 16) | (g << 8) | b); } } return drawPixels(srcPixels, srcW, srcH); } /* * 图片特效黑白 */ public Image effect_black_white(Image src) { int srcW = src.getWidth(); int srcH = src.getHeight(); int[] srcPixels = getPixels(src); int r = 0; int g = 0; int b = 0; int a = 0; int argb; int temp; for (int i = 0; i < srcH; i++) { for(int ii=0;ii<srcW;ii++) { argb = srcPixels[i*srcW+ii]; a = ((argb & 0xff000000) >> 24); // alpha channel r = ((argb & 0x00ff0000) >> 16); // red channel g = ((argb & 0x0000ff00) >> 8); // green channel b = (argb & 0x000000ff); // blue channel temp = (int)(.299*(double)r+.587*(double)g+.114*(double)b); r = temp; g = temp; b = temp; srcPixels[i*srcW+ii] = ((a << 24) | (r << 16) | (g << 8) | b); } } return drawPixels(srcPixels, srcW, srcH); } /* * 图片特效粉笔画 */ public Image effect_crayon(Image src) { int srcW = src.getWidth(); int srcH = src.getHeight(); int[] srcPixels = getPixels(src); int r = 0; int g = 0; int b = 0; int a = 0; int argb; int r1 = 0; int g1 = 0; int b1 = 0; int a1 = 0; int r2 = 0; int g2 = 0; int b2 = 0; int a2 = 0; for (int i = 0; i < srcH; i++) { for(int ii=0;ii<srcW;ii++) { argb = srcPixels[i*srcW+ii]; a = ((argb & 0xff000000) >> 24); // alpha channel r = ((argb & 0x00ff0000) >> 16); // red channel g = ((argb & 0x0000ff00) >> 8); // green channel b = (argb & 0x000000ff); // blue channel if(i+1 == srcH) { r1= 0; g1= 0; b1=0; } else { argb = srcPixels[(i+1)*srcW+ii]; //a1 = ((argb & 0xff000000) >> 24); // alpha channel r1 = ((argb & 0x00ff0000) >> 16); // red channel g1 = ((argb & 0x0000ff00) >> 8); // green channel b1 = (argb & 0x000000ff); // blue channel } if(ii+1 == srcW){ r2= 0; g2= 0; b2=0; } else { argb = srcPixels[i*srcW+ii+1]; r2 = ((argb & 0x00ff0000) >> 16); // red channel g2 = ((argb & 0x0000ff00) >> 8); // green channel b2 = (argb & 0x000000ff); // blue channel } // rr1=(r1-r2)^2 rr2=(r1-r3)^2 r = (int)Math.sqrt((double)(2*(r-r1)*(r-r1)+(r-r2)*(r-r2))); g = (int)Math.sqrt((double)(2*(g-g1)*(g-g1)+(g-g2)*(g-g2))); b = (int)Math.sqrt((double)(2*(b-b1)*(b-b1)+(b-b2)*(b-b2))); r =255-r; // red channel g =255-g; // green channel b =255-b; // blue channel srcPixels[i*srcW+ii] = ((a << 24) | (r << 16) | (g << 8) | b); } } return drawPixels(srcPixels, srcW, srcH); } /* * 图片特效蒙版 */ public Image effect_hoodwink(Image src) { int srcW = src.getWidth(); int srcH = src.getHeight(); int[] srcPixels = getPixels(src); int r = 0; int g = 0; int b = 0; int a = 0; int argb; for (int i = 0; i < srcH; i++) { for(int ii=0;ii<srcW;ii++) { argb = srcPixels[i*srcW+ii]; a = ((argb & 0xff000000) >> 24); // alpha channel r = ((argb & 0x00ff0000) >> 16); // red channel g = ((argb & 0x0000ff00) >> 8); // green channel b = (argb & 0x000000ff); // blue channel r = (int)(.299*(double)r); g = (int)(.587*(double)g); b = (int)(.114*(double)b); srcPixels[i*srcW+ii] = ((a << 24) | (r << 16) | (g << 8) | b); } } return drawPixels(srcPixels, srcW, srcH); } private int[] getTransImg(int alpha,int[] srcRgbdata,int[] desRgbdata) { int [] tempRgbData = new int[desRgbdata.length]; int sr ; int sg ; int sb ; int dr ; int dg ; int db ; int tr ; int tg ; int tb ; for(int i=0;i<desRgbdata.length;i++) { sr = (srcRgbdata[i]&0xff0000)>>16; sg = (srcRgbdata[i]&0xff00)>>8; sb = srcRgbdata[i]&0xff; dr = (desRgbdata[i]&0xff0000)>>16; dg = (desRgbdata[i]&0xff00)>>8; db = desRgbdata[i]&0xff; tr = (sr*alpha + dr*(255-alpha))/255; tg = (sg*alpha + dg*(255-alpha))/255; tb = (sb*alpha + db*(255-alpha))/255; tempRgbData[i] = (tr<<16)|(tg<<8)|tb; } return tempRgbData; } /* * 图片特旋转 */ public Image effect_rotate(Image src,int direction) { Sprite sprite = new Sprite(src); switch(direction) { case 1: sprite.setTransform(sprite.TRANS_ROT270); break; case 2: sprite.setTransform(sprite.TRANS_ROT90); break; } Image temp = Image.createImage(src.getHeight(),src.getWidth()); Graphics g = temp.getGraphics(); sprite.setPosition(0,0); sprite.paint(g); return temp; } /* * 图片特霓虹灯 */ public Image effect_neonLight(Image src) { int srcW = src.getWidth(); int srcH = src.getHeight(); int[] srcPixels = getPixels(src); int r = 0; int g = 0; int b = 0; int a = 0; int argb; int r1 = 0; int g1 = 0; int b1 = 0; int a1 = 0; int r2 = 0; int g2 = 0; int b2 = 0; int a2 = 0; for (int i = 0; i < srcH; i++) { for(int ii=0;ii<srcW;ii++) { argb = srcPixels[i*srcW+ii]; a = ((argb & 0xff000000) >> 24); // alpha channel r = ((argb & 0x00ff0000) >> 16); // red channel g = ((argb & 0x0000ff00) >> 8); // green channel b = (argb & 0x000000ff); // blue channel if(i+1 == srcH) { r1= 0; g1= 0; b1=0; } else { argb = srcPixels[(i+1)*srcW+ii]; //a1 = ((argb & 0xff000000) >> 24); // alpha channel r1 = ((argb & 0x00ff0000) >> 16); // red channel g1 = ((argb & 0x0000ff00) >> 8); // green channel b1 = (argb & 0x000000ff); // blue channel } if(ii+1 == srcW){ r2= 0; g2= 0; b2=0; } else { argb = srcPixels[i*srcW+ii+1]; r2 = ((argb & 0x00ff0000) >> 16); // red channel g2 = ((argb & 0x0000ff00) >> 8); // green channel b2 = (argb & 0x000000ff); // blue channel } // rr1=(r1-r2)^2 rr2=(r1-r3)^2 r = (int)Math.sqrt((double)(2*(r-r1)*(r-r1)+(r-r2)*(r-r2))); g = (int)Math.sqrt((double)(2*(g-g1)*(g-g1)+(g-g2)*(g-g2))); b = (int)Math.sqrt((double)(2*(b-b1)*(b-b1)+(b-b2)*(b-b2))); srcPixels[i*srcW+ii] = ((a << 24) | (r << 16) | (g << 8) | b); } } return drawPixels(srcPixels, srcW, srcH); }}?引用：http://blog.csdn.net/alajl/article/details/2284924