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POI want to set Brightness of an image on SeekBar OnProgres change event in Android?
 

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  1. POI want to set Brightness of an image on SeekBar OnProgres change event in Android?
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    <p>I want to set Brightness of an image on SeekBar OnProgres change event? I am showing an image in imageview and below that there is an SeekBar to change the Brightness of an image.</p> <p><strong>1)</strong> I am using following function to set brightness</p> <pre><code>private static void setBrightness(ColorMatrix cm, float contrast) { float scale = contrast + 1.f; float translate = (-.5f * scale + .5f) * 255.f; cm.set(new float[] { 1, 0, 0, 0, translate, 0, 1, 0, 0, translate, 0, 0, 1, 0, translate, 0, 0, 0, 1, 0 }); } </code></pre> <p><strong>2)</strong> I was able to set brightness of an image using following code</p> <pre><code>@Override protected void onDraw(Canvas canvas) { Paint paint = mPaint; float x = 20; float y = 20; float[]pos={5,5}; canvas.drawColor(Color.WHITE); paint.setColorFilter(null); canvas.drawText("Original Image", 5,20, paint); canvas.drawBitmap(mBitmap, x, y, paint); ColorMatrix cm = new ColorMatrix(); mAngle += 2; if (mAngle &gt; 180) { mAngle = 0; } //convert our animated angle [-180...180] to a contrast value of [-1..1] float contrast = mAngle / 180.f; canvas.drawText("Brightness", 5,y + 60, paint); setBrightness(cm, contrast);//Brightness paint.setColorFilter(new ColorMatrixColorFilter(cm)); canvas.drawBitmap(mBitmap, x ,y + mBitmap.getWidth() + 10, paint); invalidate(); } </code></pre> <p><strong>3)</strong> Now I want to change the brightness of an image on SeekBar OnProgress change event, but for that I require to have an relationship between ColorMatrix and Bitmap.</p> <p>Because I don't want to draw an image I want to modify an existing image. i.e. I am showing an image in imageview and below that there is an SeekBar to change the Brightness of an image.</p> <p>Please help me to change the Brightness of an image onSeekBar Progressed change event.</p>
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