Awesome

android-image-filter

some android image filters

in some filter, I use NDK to implement to make it more efficient

Setup

Install Android NDK and properly configure it: http://goo.gl/koTCb
Get a clean clone of this project, import the library in Android Studio
then Clean and Build the hold project to regenerate the library
Then just add library module as a dependency to your existing project.

How to Use it

It is dead simple, you can see magic in the following code:

  Bitmap newBitmap = BitmapFilter.changeStyle(originBitmap, BitmapFilter.BLUR_STYLE);
  imageView.setImageBitmap(newBitmap);

and there are some options for the filter, you can go to see the demo to see how to use this options to customize your filter effect

You can see all filters in file BitmapFilter.java, currently contains totally 19 kinds of filters now, here is the list of filters and their options(show by code):

Grayscale
Relief

Blur(Average Smooth)

BitmapFilter.changeStyle(originBitmap, BitmapFilter.BLUR_STYLE, maskSize);

maskSize is a integer, to indicate the average blur mask's size

Oil Painting

Neon

BitmapFilter.changeStyle(originBitmap, BitmapFilter.NEON_STYLE, 
neon_color_R, neon_color_G, neon_color_B);

neon_color_R, neon_color_G, neon_color_B are the R,G,B component are integer

Pixelate

BitmapFilter.changeStyle(originBitmap, BitmapFilter.PIXELATE_STYLE, pixelSize);

pixelSize is a integer, the pixel size for this filter

Old TV
Invert Color
Block
Old Photo
Sharpen(By Laplacian)

Light

BitmapFilter.changeStyle(originBitmap, BitmapFilter.LIGHT_STYLE, light_center_x, light_center_y, light_radius);

light_center_x, light_center_y are integer, indicate the center of the light spot, the origin in the left-upper side, and the light_radius is indicate the radius of light spot, in pixel

Lomo

BitmapFilter.changeStyle(originBitmap, BitmapFilter.LOMO_STYLE, roundRadius);

roundRadius is a double, the black round's radius in the effect

HDR
Gaussian Blur
```
BitmapFilter.changeStyle(originBitmap, BitmapFilter.GAUSSIAN_BLUR_STYLE, sigma);
```
sigma is a double, the sigma value in Gaussian Blur, the bigger of sigma, the smoother in the result image
Soft Glow
```
BitmapFilter.changeStyle(originBitmap, BitmapFilter.SOFT_GLOW_STYLE, sigma);
```
sigma is a double, the same as sigma in Gaussian Blur, indicate the sigma value in the process of Gaussian Blur for Soft Glow
Sketch
Motion Blur
```
BitmapFilter.changeStyle(originBitmap, BitmapFilter.SOFT_GLOW_STYLE, xSpeed, ySpeed);
```
xSpeed and ySpeed are both integer, indicate the speed in x-axis and y-axis, the origin in the left-upper side
Gotham

PS: all options have defalut values, so you can just select the effect and pass nothing, like this:

BitmapFilter.changeStyle(originBitmap, BitmapFilter.MOTION_BLUR_STYLE);

If you have any question, please open an issue and show your code and the program ouput, thanks!

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.