Develop Reference

How can we enhance apply Brightness Effect with custom filter?

I am trying to add custom filter and add brightness and contrast, but it takes to much time.
How can i decrease these times?
Can we use other way or add filter over filter?
//main class
private ImageView imgMain;
imgMain = (ImageView) findViewById(R.id.effect_main);
imgMain.setColorFilter(filterClass.setFilter(2));
Bitmap bitmap = ((BitmapDrawable)imgMain.getDrawable()).getBitmap();
bitmap =imgFilter.applyBrightnessEffect(bitmap , 150);
imgMain.setImageBitmap(bitmap);
for custom filter
//filter methords
public ColorMatrixColorFilter catNightFilter() {
float[] matrix = {
89, 61, -5, 0, 0, //red
77, 67, 24, 0, 0, //green
-57, -13, 81, 0, 0, //blue
0, 0, 0, 0, 0 //alpha
};
ColorMatrix cm = new ColorMatrix(matrix);``
return new ColorMatrixColorFilter(cm);
}
This Brightness code takes to much time it convert each pixel.
// scan through all pixels
//britness methord
public Bitmap applyBrightnessEffect(Bitmap src, int value) {
// image size
int width = src.getWidth();
int height = src.getHeight();
// create output bitmap
Bitmap bmOut = Bitmap.createBitmap(width, height, src.getConfig());
// color information
int A, R, G, B;
int pixel;
for(int x = 0; x < width; ++x) {
for(int y = 0; y < height; ++y) {
// get pixel color
pixel = src.getPixel(x, y);
A = Color.alpha(pixel);
R = Color.red(pixel);
G = Color.green(pixel);
B = Color.blue(pixel);
// increase/decrease each channel
R += value;
if(R > 255) { R = 255; }
else if(R < 0) { R = 0; }
G += value;
if(G > 255) { G = 255; }
else if(G < 0) { G = 0; }
B += value;
if(B > 255) { B = 255; }
else if(B < 0) { B = 0; }
// apply new pixel color to output bitmap
bmOut.setPixel(x, y, Color.argb(A, R, G, B));
}
}
// return final image
return bmOut;
}

How can i implement seek bar to change contrast

I am trying to implement a seek bar to change contrast of an image in android. Anyone Help me to Implement this please.There is any other options for image processing ?
Does anyone know the solution Please help me
Thanks in Advance.
CODE:
public class MainActivity extends ActionBarActivity {
ImageView imViewAndroid;
private SeekBar seekbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
seekbar = (SeekBar) findViewById(R.id.seekbar);
imViewAndroid = (ImageView) findViewById(R.id.imViewAndroid);
seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
#Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
imViewAndroid.setImageBitmap(takeContrast(BitmapFactory.decodeResource(getResources(), R.drawable.dicom), 100));
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
public Bitmap takeContrast(Bitmap src, double value) {
// src image size
int width = src.getWidth();
int height = src.getHeight();
// create output bitmap with original size
Bitmap bmOut = Bitmap.createBitmap(width, height, src.getConfig());
// color information
int A, R, G, B;
int pixel;
// get contrast value
double contrast = Math.pow((100 + value) / 100, 2);
// scan through all pixels
for(int x = 0; x < width; ++x) {
for(int y = 0; y < height; ++y) {
// get pixel color
pixel = src.getPixel(x, y);
A = Color.alpha(pixel);
// apply filter contrast for every channel R, G, B
R = Color.red(pixel);
R = (int)(((((R / 255.0) - 0.5) * contrast) + 0.5) * 255.0);
if(R < 0) { R = 0; }
else if(R > 255) { R = 255; }
G = Color.red(pixel);
G = (int)(((((G / 255.0) - 0.5) * contrast) + 0.5) * 255.0);
if(G < 0) { G = 0; }
else if(G > 255) { G = 255; }
B = Color.red(pixel);
B = (int)(((((B / 255.0) - 0.5) * contrast) + 0.5) * 255.0);
if(B < 0) { B = 0; }
else if(B > 255) { B = 255; }
// set new pixel color to output bitmap
bmOut.setPixel(x, y, Color.argb(A, R, G, B));
}
}
// return final image
return bmOut;
}

You call the function to change contrast in a wrong place it should be here
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean b) {
// call the method here, default progress is <0, 100>
}
You use very slow function to change the contrast. There are plenty answers already on StackOverflow, have a look at this answer. Search before you ask.
Look at this full implementation on my github.

The above code takes too much time for processing image. If you use my code processing of image takes very less time.
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean b) {
contrastAndBrightnessControler(bitmap,seekbar.getProgress()/10,0.7)
}
public static Bitmap contrastAndBrightnessControler(Bitmap bitmap, float contrast, float brightness)
{
ColorMatrix cmatrix = new ColorMatrix(new float[]
{
contrast, 0, 0, 0, brightness,
0, contrast, 0, 0, brightness,
0, 0, contrast, 0, brightness,
0, 0, 0, 1, 0
});
Bitmap ret =Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), bitmap.getConfig());
Canvas canvas = new Canvas(ret);
Paint paint = new Paint();
paint.setColorFilter(new ColorMatrixColorFilter(cmatrix));
canvas.drawBitmap(bitmap, 0, 0, paint);
return ret;
}

Enhancing ImageView brightness programmatically

I have an android app in which I am increasing brightness of image with the code below. But this is very slow so does anyone knows a fast way to enhance image brightness of an imageview in android. Keep in mind this is improving imageview brightness not screen brightness
public static Bitmap doBrightness(Bitmap src, int value) {
//Log.e("Brightness", "Changing brightnhjh");
int width = src.getWidth();
int height = src.getHeight();
Bitmap bmout = Bitmap.createBitmap(width, height, src.getConfig());
int A, R, G, B;
int pixel;
for (int i = 0; i < width; i=i++) {
for (int j = 0; j < height; j=j++) {
pixel = src.getPixel(i, j);
A = Color.alpha(pixel);
R = Color.red(pixel);
G = Color.green(pixel);
B = Color.blue(pixel);
R += value;
if (R > 255) {
R = 255;
} else if (R < 0) {
R = 0;
}
G += value;
if (G > 255) {
G = 255;
} else if (G < 0) {
G = 0;
}
B += value;
if (B > 255) {
B = 255;
} else if (B < 0) {
B = 0;
}
bmout.setPixel(i, j, Color.argb(A, R, G, B));
}
}
return bmout;
}
this is the imageview
imageview.setImageBitmap(doBrightness(image, 40));

You can use the following code to enhance the image :
public static Bitmap enhanceImage(Bitmap mBitmap, float contrast, float brightness) {
ColorMatrix cm = new ColorMatrix(new float[]
{
contrast, 0, 0, 0, brightness,
0, contrast, 0, 0, brightness,
0, 0, contrast, 0, brightness,
0, 0, 0, 1, 0
});
Bitmap mEnhancedBitmap = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(), mBitmap
.getConfig());
Canvas canvas = new Canvas(mEnhancedBitmap);
Paint paint = new Paint();
paint.setColorFilter(new ColorMatrixColorFilter(cm));
canvas.drawBitmap(mBitmap, 0, 0, paint);
return mEnhancedBitmap;
}
note :
contrast : 0 to 10
brightness : -255 to 255

I have got a work around for this issue i made the image brighter and then shown it in an imageview. The code i used is given below:
foto.setColorFilter(brightIt(100));//foto is my ImageView
//and below is the brightIt func
public static ColorMatrixColorFilter brightIt(int fb) {
ColorMatrix cmB = new ColorMatrix();
cmB.set(new float[] {
1, 0, 0, 0, fb,
0, 1, 0, 0, fb,
0, 0, 1, 0, fb,
0, 0, 0, 1, 0 });
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.set(cmB);
//Canvas c = new Canvas(b2);
//Paint paint = new Paint();
ColorMatrixColorFilter f = new ColorMatrixColorFilter(colorMatrix);
//paint.setColorFilter(f);
return f;
}

I can't exactly remember where i got this from but i use this (with negative value to get something darker, put some positive value to get something bright)
drawable.setColorFilter(applyLightness(-30));
public static PorterDuffColorFilter applyLightness(int progress)
{
if (progress > 0)
{
int value = (int) progress * 255 / 100;
return new PorterDuffColorFilter(Color.argb(value, 255, 255, 255), Mode.SRC_OVER);
}
else
{
int value = (int) (progress * -1) * 255 / 100;
return new PorterDuffColorFilter(Color.argb(value, 0, 0, 0), Mode.SRC_ATOP);
}
}
edit : found where i took this from : Adjusting Lightness using ColorMatrix

The above answers didnt work for me as I had an imageview with image set using bitmap.
So this is what it worked:
private ColorMatrixColorFilter brightness(float value) {
ColorMatrix cmB = new ColorMatrix();
cmB.set(new float[]{
1, 0, 0, 0, value,
0, 1, 0, 0, value,
0, 0, 1, 0, value,
0, 0, 0, 1, 0});
return new ColorMatrixColorFilter(cmB);
}
Have a seek bar with controls the brightness.Its range is from -255 to 255.
sbBrightness.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if(fromUser){
photoFilterView.getSource().setColorFilter(brightness(progress));
/* Filter brightness=new Filter();
brightness.addSubFilter(new BrightnessSubFilter(progress));
Bitmap ouputImage = brightness.processFilter(bm);
photoFilterView.getSource().setImageBitmap(ouputImage);*/
}
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
sbBrightness.setVisibility(View.GONE);
}
},1000);
}
});
Hope it helps some.

You can place a semi-transparent view on top of your ImageView. How: a FrameView with two children, the 1st one is the ImageView and the 2nd is a View (just View) with a semi-transparent background. Then you will have to modify the background opacity programmatically.

how to make the color image to black and white in Android

I wanted to know the way to convert the color image (which i am downloading from net) to black and white when i am displaying it to the user in android.
can anybody found this requirement in any of your android work. Please let me know.
Thanks
Lakshman

Hi you can make the image black n white using contrast.
See the code..
public static Bitmap createContrast(Bitmap src, double value) {
// image size
int width = src.getWidth();
int height = src.getHeight();
// create output bitmap
Bitmap bmOut = Bitmap.createBitmap(width, height, src.getConfig());
// color information
int A, R, G, B;
int pixel;
// get contrast value
double contrast = Math.pow((100 + value) / 100, 2);
// scan through all pixels
for(int x = 0; x < width; ++x) {
for(int y = 0; y < height; ++y) {
// get pixel color
pixel = src.getPixel(x, y);
A = Color.alpha(pixel);
// apply filter contrast for every channel R, G, B
R = Color.red(pixel);
R = (int)(((((R / 255.0) - 0.5) * contrast) + 0.5) * 255.0);
if(R < 0) { R = 0; }
else if(R > 255) { R = 255; }
G = Color.red(pixel);
G = (int)(((((G / 255.0) - 0.5) * contrast) + 0.5) * 255.0);
if(G < 0) { G = 0; }
else if(G > 255) { G = 255; }
B = Color.red(pixel);
B = (int)(((((B / 255.0) - 0.5) * contrast) + 0.5) * 255.0);
if(B < 0) { B = 0; }
else if(B > 255) { B = 255; }
// set new pixel color to output bitmap
bmOut.setPixel(x, y, Color.argb(A, R, G, B));
}
}
return bmOut;
}
Set the double value to 50 on mathod call. For Example createContrast(Bitmap src, 50)

Use the built-in methods:
public static Bitmap toGrayscale(Bitmap srcImage) {
Bitmap bmpGrayscale = Bitmap.createBitmap(srcImage.getWidth(), srcImage.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bmpGrayscale);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
paint.setColorFilter(new ColorMatrixColorFilter(cm));
canvas.drawBitmap(srcImage, 0, 0, paint);
return bmpGrayscale;
}

Convert bitmap to sepia in android

Is there any way to convert a Bitmap to sepia?
I know to convert to grayScale is to set the setSaturation in ColorMatrix.
But what about Sepia?

If you have instance of image then you can use ColorMartix to draw it in Sepia. Let me describe way how you can do this using Drawable.
public static void setSepiaColorFilter(Drawable drawable) {
if (drawable == null)
return;
final ColorMatrix matrixA = new ColorMatrix();
// making image B&W
matrixA.setSaturation(0);
final ColorMatrix matrixB = new ColorMatrix();
// applying scales for RGB color values
matrixB.setScale(1f, .95f, .82f, 1.0f);
matrixA.setConcat(matrixB, matrixA);
final ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrixA);
drawable.setColorFilter(filter);
}
Sample project was moved from Bitbucket to GitHub. Please check Release section to download APK binary to test without compiling.

I know the answer, but maybe if some have other better solution..
public Bitmap toSephia(Bitmap bmpOriginal)
{
int width, height, r,g, b, c, gry;
height = bmpOriginal.getHeight();
width = bmpOriginal.getWidth();
int depth = 20;
Bitmap bmpSephia = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bmpSephia);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setScale(.3f, .3f, .3f, 1.0f);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
paint.setColorFilter(f);
canvas.drawBitmap(bmpOriginal, 0, 0, paint);
for(int x=0; x < width; x++) {
for(int y=0; y < height; y++) {
c = bmpOriginal.getPixel(x, y);
r = Color.red(c);
g = Color.green(c);
b = Color.blue(c);
gry = (r + g + b) / 3;
r = g = b = gry;
r = r + (depth * 2);
g = g + depth;
if(r > 255) {
r = 255;
}
if(g > 255) {
g = 255;
}
bmpSephia.setPixel(x, y, Color.rgb(r, g, b));
}
}
return bmpSephia;
}

I've improved on the OP's answer. This runs competitively fast when compared to the ColorMatrix method, but producing a nicer brown tone. (in my opinion)
public Bitmap toSepiaNice(Bitmap color) {
int red, green, blue, pixel, gry;
int height = color.getHeight();
int width = color.getWidth();
int depth = 20;
Bitmap sepia = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
int[] pixels = new int[width * height];
color.getPixels(pixels, 0, width, 0, 0, width, height);
for (int i = 0; i < pixels.length; i++) {
pixel = pixels[i];
red = (pixel >> 16) & 0xFF;
green = (pixel >> 8) & 0xFF;
blue = pixel & 0xFF;
red = green = blue = (red + green + blue) / 3;
red += (depth * 2);
green += depth;
if (red > 255)
red = 255;
if (green > 255)
green = 255;
pixels[i] = (0xFF << 24) | (red << 16) | (green << 8) | blue;
}
sepia.setPixels(pixels, 0, width, 0, 0, width, height);
return sepia;
}