"Turn" four, Android image effect processing of the negative effects

This article will deal with the effect of film effects. As before, the pixel is processed, and the algorithm is universal.

Algorithm principle: The RGB value of the current pixel points and the difference of 255 respectively as the current point of the RGB value.

Cases:

Abc

To find the negative effect of B point:

B.R = 255-B.R;

B.G = 255-B.G;

b.b = 255-b.b;

：

Original:

Code:

 PackageCom.color;ImportAndroid.content.Context;ImportAndroid.graphics.Bitmap;Importandroid.graphics.BitmapFactory;ImportAndroid.graphics.Canvas;ImportAndroid.graphics.Color;ImportAndroid.graphics.Paint;ImportAndroid.util.AttributeSet;ImportAndroid.widget.ImageView; Public classColorviewextendsImageView {PrivatePaint Mypaint =NULL; PrivateBitmap Bitmap =NULL; Private intWidth,height; Private int[] oldpixels; Private int[] newpixels; Private intColor,color2; Private intPIXELSR,PIXELSG,PIXELSB,PIXELSA,PIXELSR2,PIXELSG2,PIXELSB2;  PublicColorview (Context context, AttributeSet attrs) {Super(context, attrs); Bitmap=Bitmapfactory.decoderesource (Context.getresources (), R.DRAWABLE.WW); Width=bitmap.getwidth (); Height=bitmap.getheight (); Oldpixels=New int[width*height]; Newpixels=New int[width*height];    Invalidate (); } @Overrideprotected voidOnDraw (canvas canvas) {Super. OnDraw (canvas); //Get PixelBitmap.getpixels (oldpixels, 0, width, 0, 0, width, height);  for(inti = 1;i < height*width; i++) {color=Oldpixels[i]; //Get RGB ComponentsPixelsa =Color.alpha (Color); PIXELSR=color.red (Color); PIXELSG=Color.green (Color); PIXELSB=Color.Blue (Color); //ConversionPIXELSR = (255-PIXELSR); PIXELSG= (255-PIXELSG); PIXELSB= (255-pixelsb); //is less than or equal to 255 greater than or equal to 0                if(PIXELSR > 255) {PIXELSR= 255; }                Else if(PIXELSR < 0) {PIXELSR= 0; }                if(Pixelsg > 255) {PIXELSG= 255; }                Else if(PIXELSG < 0) {PIXELSG= 0; }                if(Pixelsb > 255) {pixelsb= 255; }                Else if(PIXELSB < 0) {pixelsb= 0; }                //generate new pixels based on new RGBNewpixels[i] =Color.argb (Pixelsa, PIXELSR, PIXELSG, PIXELSB); }        //generate new pictures based on new pixelsBitmap.setpixels (newpixels, 0, width, 0, 0, width, height); Canvas.drawbitmap (Bitmap,0,0, Mypaint); }}