public static Bitmap ToSepia(Bitmap source)
{
using (ColorMatrix saturation = new ColorMatrix())
using (ColorMatrix rgbFilter = new ColorMatrix())
{
saturation.SetSaturation(0f);
rgbFilter.SetScale(1.0f, 0.95f, 0.82f, 1.0f);
saturation.SetConcat(rgbFilter, saturation);
return ColorSpaceTransformation.ToColorSpace(source, saturation);
}
}
protected override void OnCreate(Bundle bundle)
{
_bitmap = BitmapFactory.DecodeResource(Resources, Resource.Drawable.image_for_cropping);
base.OnCreate (bundle);
_mainLayout = new MainLayout (this);
_mainLayout.ImageView.SetBitmap (_bitmap);
var filter = new ColorMatrix ();
filter.SetScale (1, 1, 1, 1);
_mainLayout.ImageView.SetFilter (filter);
SetContentView (_mainLayout);
_mainLayout.RedSeek.Progress = _mainLayout.GreenSeek.Progress = _mainLayout.BlueSeek.Progress = _mainLayout.AlphaSeek.Progress = 50;
_mainLayout.RedSeek.StopTrackingTouch += OnChangeSeek;
_mainLayout.GreenSeek.StopTrackingTouch += OnChangeSeek;
_mainLayout.BlueSeek.StopTrackingTouch += OnChangeSeek;
_mainLayout.AlphaSeek.StopTrackingTouch += OnChangeSeek;
_mainLayout.LoadImage.Click += LoadImage;
}
private void OnChangeSeek(object sender, Android.Widget.SeekBar.StopTrackingTouchEventArgs e)
{
float scailR = 2f * _mainLayout.RedSeek.Progress / 100F;
float scailG = 2f * _mainLayout.GreenSeek.Progress / 100F;
float scailB = 2f * _mainLayout.BlueSeek.Progress / 100F;
float scailA = 2f * _mainLayout.AlphaSeek.Progress / 100F;
var filter = new ColorMatrix ();
filter.SetScale (scailR, scailG, scailB, scailA);
_mainLayout.ImageView.SetFilter (filter);
_mainLayout.TextView.Text = "R: " + scailR + " | G: " + scailG + " | B : " + scailB + " | A: " + scailA;
}
