Scale color and alpha of colormatrix with setScale()

Advertisemen
Example of using ColorMatrix.setScale(float rScale, float gScale, float bScale, float aScale).

Example of using ColorMatrix.setScale()

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.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
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;
ImageView imageResult;
SeekBar scaleBarRed, scaleBarGreen, scaleBarBlue, scaleBarAlpha;
TextView cmScaleText;

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);
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);
}
});

cmScaleText = (TextView) findViewById(R.id.textCMScale);
scaleBarRed = (SeekBar) findViewById(R.id.scalebarred);
scaleBarGreen = (SeekBar) findViewById(R.id.scalebargreen);
scaleBarBlue = (SeekBar) findViewById(R.id.scalebarblue);
scaleBarAlpha = (SeekBar) findViewById(R.id.scalebaralpha);
scaleBarRed.setOnSeekBarChangeListener(seekBarChangeListener);
scaleBarGreen.setOnSeekBarChangeListener(seekBarChangeListener);
scaleBarBlue.setOnSeekBarChangeListener(seekBarChangeListener);
scaleBarAlpha.setOnSeekBarChangeListener(seekBarChangeListener);

}

@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));

scaleBarRed.setProgress(100);
scaleBarGreen.setProgress(100);
scaleBarBlue.setProgress(100);
scaleBarAlpha.setProgress(100);

loadBitmapScaleColor();

} 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) {
loadBitmapScaleColor();
}
};

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

int progressScaleRed = scaleBarRed.getProgress();
int progressScaleGreen = scaleBarGreen.getProgress();
int progressScaleBlue = scaleBarBlue.getProgress();
int progressScaleAlpha = scaleBarAlpha.getProgress();

float scaleRed = (float) progressScaleRed/100;
float scaleGreen = (float) progressScaleGreen/100;
float scaleBlue = (float) progressScaleBlue/100;
float scaleAlpha = (float) progressScaleAlpha/100;

cmScaleText.setText("setScale: "
+ String.valueOf(scaleRed) + ", "
+ String.valueOf(scaleGreen) + ", "
+ String.valueOf(scaleBlue) + ", "
+ String.valueOf(scaleAlpha));

Bitmap bitmapColorScaled = updateScale(
bitmapMaster,
scaleRed,
scaleGreen,
scaleBlue,
scaleAlpha);

imageResult.setImageBitmap(bitmapColorScaled);
}
}

private Bitmap updateScale(Bitmap src, float rScale, float gScale,
float bScale, float aScale) {

int w = src.getWidth();
int h = src.getHeight();

Bitmap bitmapResult = Bitmap
.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas canvasResult = new Canvas(bitmapResult);
Paint paint = new Paint();
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.setScale(rScale, gScale, bScale, aScale);
ColorMatrixColorFilter filter = new ColorMatrixColorFilter(colorMatrix);
paint.setColorFilter(filter);
canvasResult.drawBitmap(src, 0, 0, paint);

return bitmapResult;
}
}


<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" />

<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent" >

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >

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

<TextView
android:id="@+id/textCMScale"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="ColorMatrix Scale" />

<SeekBar
android:id="@+id/scalebarred"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="200"
android:progress="100" />
<SeekBar
android:id="@+id/scalebargreen"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="200"
android:progress="100" />
<SeekBar
android:id="@+id/scalebarblue"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="200"
android:progress="100" />
<SeekBar
android:id="@+id/scalebaralpha"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="200"
android:progress="100" />
</LinearLayout>
</ScrollView>

</LinearLayout>


download filesDownload the files.

download filesDownload and try the APK.



more: Something about processing images in Android

Advertisemen

Disclaimer: Gambar, artikel ataupun video yang ada di web ini terkadang berasal dari berbagai sumber media lain. Hak Cipta sepenuhnya dipegang oleh sumber tersebut. Jika ada masalah terkait hal ini, Anda dapat menghubungi kami disini.
Related Posts
Disqus Comments
© Copyright 2017 GENERAL INFO FOR ANDROID DEVELOPMENT - All Rights Reserved - Template Created by goomsite - Proudly powered by Blogger