Adjust HSV(Hue, Saturation and Value) of bitmap

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android.graphics.Color class provide colorToHSV() and HSVToColor() methods to convert between ARGB color and HSV components. Such that we can adjust HSV of bitmap.

Adjust HSV(Hue, Saturation and Value) of bitmap

package com.example.androiddrawbitmap;

import java.io.FileNotFoundException;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class MainActivity extends Activity {

Button btnLoadImage;
TextView textSource;
ImageView imageResult;
SeekBar hueBar, satBar, valBar;
TextView hueText, satText, valText;
Button btnResetHSV;

final int RQS_IMAGE1 = 1;

Uri source;
Bitmap bitmapMaster;
Canvas canvasMaster;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

btnLoadImage = (Button) findViewById(R.id.loadimage);
textSource = (TextView) findViewById(R.id.sourceuri);
imageResult = (ImageView) findViewById(R.id.result);

btnLoadImage.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
Intent intent = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, RQS_IMAGE1);
}
});

hueText = (TextView) findViewById(R.id.texthue);
satText = (TextView) findViewById(R.id.textsat);
valText = (TextView) findViewById(R.id.textval);
hueBar = (SeekBar) findViewById(R.id.huebar);
satBar = (SeekBar) findViewById(R.id.satbar);
valBar = (SeekBar) findViewById(R.id.valbar);
hueBar.setOnSeekBarChangeListener(seekBarChangeListener);
satBar.setOnSeekBarChangeListener(seekBarChangeListener);
valBar.setOnSeekBarChangeListener(seekBarChangeListener);
btnResetHSV = (Button)findViewById(R.id.resethsv);
btnResetHSV.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {
// reset SeekBars
hueBar.setProgress(256);
satBar.setProgress(256);
valBar.setProgress(256);

loadBitmapHSV();
}});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);

if (resultCode == RESULT_OK) {
switch (requestCode) {
case RQS_IMAGE1:
source = data.getData();

try {
bitmapMaster = BitmapFactory
.decodeStream(getContentResolver().openInputStream(
source));

// reset SeekBars
hueBar.setProgress(256);
satBar.setProgress(256);
valBar.setProgress(256);

loadBitmapHSV();

} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

break;
}
}
}

OnSeekBarChangeListener seekBarChangeListener = new OnSeekBarChangeListener() {

@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub

}

@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub

}

@Override
public void onStopTrackingTouch(SeekBar seekBar) {
loadBitmapHSV();
}

};

private void loadBitmapHSV() {
if (bitmapMaster != null) {

int progressHue = hueBar.getProgress() - 256;
int progressSat = satBar.getProgress() - 256;
int progressVal = valBar.getProgress() - 256;

/*
* Hue (0 .. 360) Saturation (0...1) Value (0...1)
*/

float hue = (float) progressHue * 360 / 256;
float sat = (float) progressSat / 256;
float val = (float) progressVal / 256;

hueText.setText("Hue: " + String.valueOf(hue));
satText.setText("Saturation: " + String.valueOf(sat));
valText.setText("Value: " + String.valueOf(val));

imageResult.setImageBitmap(updateHSV(bitmapMaster, hue, sat, val));

}
}

private Bitmap updateHSV(Bitmap src, float settingHue, float settingSat,
float settingVal) {

int w = src.getWidth();
int h = src.getHeight();
int[] mapSrcColor = new int[w * h];
int[] mapDestColor = new int[w * h];

float[] pixelHSV = new float[3];

src.getPixels(mapSrcColor, 0, w, 0, 0, w, h);

int index = 0;
for (int y = 0; y < h; ++y) {
for (int x = 0; x < w; ++x) {

// Convert from Color to HSV
Color.colorToHSV(mapSrcColor[index], pixelHSV);

// Adjust HSV
pixelHSV[0] = pixelHSV[0] + settingHue;
if (pixelHSV[0] < 0.0f) {
pixelHSV[0] = 0.0f;
} else if (pixelHSV[0] > 360.0f) {
pixelHSV[0] = 360.0f;
}

pixelHSV[1] = pixelHSV[1] + settingSat;
if (pixelHSV[1] < 0.0f) {
pixelHSV[1] = 0.0f;
} else if (pixelHSV[1] > 1.0f) {
pixelHSV[1] = 1.0f;
}

pixelHSV[2] = pixelHSV[2] + settingVal;
if (pixelHSV[2] < 0.0f) {
pixelHSV[2] = 0.0f;
} else if (pixelHSV[2] > 1.0f) {
pixelHSV[2] = 1.0f;
}

// Convert back from HSV to Color
mapDestColor[index] = Color.HSVToColor(pixelHSV);

index++;
}
}

return Bitmap.createBitmap(mapDestColor, w, h, Config.ARGB_8888);

}

}


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />

<Button
android:id="@+id/loadimage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Load Image 1" />

<TextView
android:id="@+id/sourceuri"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

<ImageView
android:id="@+id/result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:background="@android:color/background_dark"
android:scaleType="centerInside" />

<TextView
android:id="@+id/texthue"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Hue" />
<SeekBar
android:id="@+id/huebar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="511"
android:progress="256"/>
<TextView
android:id="@+id/textsat"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Saturation" />
<SeekBar
android:id="@+id/satbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="511"
android:progress="256"/>
<TextView
android:id="@+id/textval"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Value" />
<SeekBar
android:id="@+id/valbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="511"
android:progress="256"/>
<Button
android:id="@+id/resethsv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Reset HSV" />
</LinearLayout>


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