Android Learning notes-: color saturation brightness processing for Android images

First, the RGBA model of the image is also briefly introduced, R refers to Red, G refers to Green, and B refers to Blue and a refers to transparency (ALPHA), which is combined into a variety of colors by the four elements.

Processing tool classes and methods:

public class Imagetools {
/**
* Processing of images
* @description:
* @date 2015-8-12 8:45:05
*/
public static Bitmap Getcolorimage (Bitmap Bitmap, float SX, float Bhd, float ld) {//Parameters are hue, saturation and brightness, respectively
Bitmap bmp = Bitmap.createbitmap (Bitmap.getwidth (), Bitmap.getheight (), Bitmap.Config.ARGB_8888);
Canvas canvas = new canvas (BMP);
Paint paint = new paint (Paint.anti_alias_flag);
ColorMatrix Sxmatrix = new ColorMatrix ();//Set Hue
Sxmatrix.setrotate (0, SX);
Sxmatrix.setrotate (1, SX);
Sxmatrix.setrotate (2, SX);

ColorMatrix Bhdmatrix = new ColorMatrix ();//Set saturation
Bhdmatrix.setsaturation (BHD);

ColorMatrix Ldmatrix = new ColorMatrix ();//Set brightness
Ldmatrix.setscale (LD, LD, LD, 1);

ColorMatrix Mixmatrix = new ColorMatrix ();//Set overall effect
Mixmatrix.postconcat (Sxmatrix);
Mixmatrix.postconcat (Bhdmatrix);
Mixmatrix.postconcat (Ldmatrix);
Paint.setcolorfilter (New Colormatrixcolorfilter (Mixmatrix));//Filter by Color filter

Canvas.drawbitmap (BMP, 0, 0, paint);//re-draw
return BMP;
}
}

Select the ImageView to be processed and the corresponding bitmap in the activity, and invoke the method in the tool class:

Private ImageView Coloriv;
Private SeekBar Sxbar, Bhdbar, Ldbar;
private static int min_color = 100;
private static int max_color = 255;
Private float SX, Bhd, LD;
Private Bitmap bmp;

@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.color_main);
Initviews ();
}

private void Initviews () {
Bmp=bitmapfactory.decoderesource (Getresources (), r.drawable.ic_launcher);
Coloriv = (ImageView) Findviewbyid (R.ID.COLOR_IV);
Coloriv.setimagebitmap (BMP);
Sxbar = (SeekBar) Findviewbyid (R.id.sx_seekbar);
Bhdbar = (SeekBar) Findviewbyid (R.id.bhd_seekbar);
Ldbar = (SeekBar) Findviewbyid (R.id.ld_seekbar);
Sxbar.setonseekbarchangelistener (this);
Sxbar.setmax (Max_color);//Set maximum value
Sxbar.setprogress (Min_color);//Set initial value (current value)
Bhdbar.setonseekbarchangelistener (this);
Bhdbar.setmax (Max_color);
Bhdbar.setprogress (Min_color);
Ldbar.setonseekbarchangelistener (this);
Ldbar.setmax (Max_color);
Ldbar.setprogress (Min_color);
}

@Override
public void onprogresschanged (SeekBar SeekBar, int progress, Boolean fromuser) {
Switch (Seekbar.getid ()) {
Case R.id.sx_seekbar:
SX = (progress-min_color) * 1.0f/min_color * 180;
Break
Case R.id.bhd_seekbar:
BHD = progress * 1.0F/MIN_COLOR;
Break
Case R.id.ld_seekbar:
LD = progress * 1.0F/MIN_COLOR;
Break
}
Coloriv.setimagebitmap (Imagetools.getcolorimage (BMP, SX, Bhd, LD));
}

@Override
public void Onstarttrackingtouch (SeekBar SeekBar) {
}


@Override
public void Onstoptrackingtouch (SeekBar SeekBar) {
}

XML layout file:

<relativelayout 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" >

<imageview
Android:id= "@+id/color_iv"
Android:layout_width= "300DP"
android:layout_height= "300DP"
Android:layout_centerhorizontal= "true"
Android:layout_marginbottom= "15DP"
android:layout_margintop= "15DP"/>

<seekbar
Android:id= "@+id/sx_seekbar"
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
android:layout_below= "@id/color_iv"
/>

<seekbar
Android:id= "@+id/bhd_seekbar"
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
android:layout_below= "@id/sx_seekbar"
android:layout_margintop= "10DP"/>

<seekbar
Android:id= "@+id/ld_seekbar"
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
android:layout_below= "@id/bhd_seekbar"
android:layout_margintop= "10DP"/>

</RelativeLayout>

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Android Learning notes-: color saturation brightness processing for Android images