Relief effect Function

This article describes the Relief Effect of image special effects. As before, pixels are processed, and algorithms are universal.

Algorithm principle: Use the RGB values of the previous pixel to subtract the RGB values of the current pixel, and add 127 to the RGB values of the current pixel respectively.

Example:

ABC

The relief effect of B is as follows:

B. R = C. R-B. R + 127;

B. G = C. G-B. G ++ 127;

B. B = c. B-B. B + 127;

Note that the RGB value ranges from 0 ~ In the range of 255.

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Source image

 

 

 

[Java]View plaincopy

1. Package com. color;
3. Import Android. content. context;
4. Import Android. Graphics. Bitmap;
5. Import Android. Graphics. bitmapfactory;
6. Import Android. Graphics. Canvas;
7. Import Android. Graphics. color;
8. Import Android. Graphics. paint;
9. Import Android. util. attributeset;
10. Import Android. widget. imageview;
12. Public class colorview extends imageview {
14. Private paint mypaint = NULL;
15. Private Bitmap bitmap = NULL;
16. Private int width, height;
17. Private int [] oldpixels;
18. Private int [] newpixels;
19. Private int color, color2;
20. Private int pixelsr, pixelsg, pixelsb, pixelsa, pixelsr2, pixelsg2, pixelsb2;
22. Public colorview (context, attributeset attrs)
23. {
24. Super (context, attrs );
25. Bitmap = bitmapfactory. decoderesource (context. getresources (), R. drawable. ww );
26. Width = bitmap. getwidth ();
27. Height = bitmap. getheight ();
28. Oldpixels = new int [width * Height];
29. Newpixels = new int [width * Height];
30. Invalidate ();
31. }
32. @ Override
33. Protected void ondraw (canvas ){
34. Super. ondraw (canvas );
35. // Retrieve pixels
36. Bitmap. getpixels (oldpixels, 0, width, 0, 0, width, height );
38. For (INT I = 1; I
39. Color = oldpixels [I-1];
40. // The first Pixel
41. Pixelsr = color. Red (color );
42. Pixelsg = color. Green (color );
43. Pixelsb = color. Blue (color );
44. // Current Pixel
45. Color2 = oldpixels [I];
46. Pixelsr2 = color. Red (color2 );
47. Pixelsg2 = color. Green (color2 );
48. Pixelsb2 = color. Blue (color2 );
50. Pixelsr = (pixelsr-pixelsr2 + 127 );
51. Pixelsg = (pixelsg-pixelsg2 + 127 );
52. Pixelsb = (pixelsb-pixelsb2 + 127 );
53. // Both are less than or equal to 255
54. If (pixelsr> 255 ){
55. Pixelsr = 255;
56. }
58. If (pixelsg & gt; 255 ){
59. Pixelsg = 255;
60. }
62. If (pixelsb> 255 ){
63. Pixelsb = 255;
64. }
66. Newpixels [I] = color. argb (pixelsa, pixelsr, pixelsg, pixelsb );
68. }
69. Bitmap. setpixels (newpixels, 0, width, 0, 0, width, height );
70. Canvas. drawbitmap (bitmap, 0, 0, mypaint );
71. }
72. }