public static Bitmap MakeGrayscale(Bitmap original)
{
using (var gr = Graphics.FromImage(original))
{
//var grayMatrix = new[]
// {
// new float[] { 0.299f, 0.299f, 0.299f, 0, 0 },
// new float[] { 0.587f, 0.587f, 0.587f, 0, 0 },
// new float[] { 0.114f, 0.114f, 0.114f, 0, 0 },
// new float[] { 0, 0, 0, 1, 0 },
// new float[] { 0, 0, 0, 0, 1 }
// };
var grayMatrix = new[]
{
new float[] { 1.5f, 1.5f, 1.5f, 0, 0 },
new float[] { 1.5f, 1.5f, 1.5f, 0, 0 },
new float[] { 1.5f, 1.5f, 1.5f, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { -1, -1, -1, 0, 1 }
};
var ia = new System.Drawing.Imaging.ImageAttributes();
ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(grayMatrix));
ia.SetThreshold(0.7f); // Change this threshold as needed
var rc = new Rectangle(0, 0, original.Width, original.Height);
gr.DrawImage(original, rc, 0, 0, original.Width, original.Height, GraphicsUnit.Pixel, ia);
}
return original;
}
public static Bitmap MakeGrayscale(Bitmap original)
{
using (var gr = Graphics.FromImage(original))
{
//var grayMatrix = new[]
// {
// new float[] { 0.299f, 0.299f, 0.299f, 0, 0 },
// new float[] { 0.587f, 0.587f, 0.587f, 0, 0 },
// new float[] { 0.114f, 0.114f, 0.114f, 0, 0 },
// new float[] { 0, 0, 0, 1, 0 },
// new float[] { 0, 0, 0, 0, 1 }
// };
var grayMatrix = new[]
{
new float[] { 1.5f, 1.5f, 1.5f, 0, 0 },
new float[] { 1.5f, 1.5f, 1.5f, 0, 0 },
new float[] { 1.5f, 1.5f, 1.5f, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { -1, -1, -1, 0, 1 }
};
var ia = new System.Drawing.Imaging.ImageAttributes();
ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(grayMatrix));
ia.SetThreshold(0.7f); // Change this threshold as needed
var rc = new Rectangle(0, 0, original.Width, original.Height);
gr.DrawImage(original, rc, 0, 0, original.Width, original.Height, GraphicsUnit.Pixel, ia);
}
return(original);
}
private static string MakeImageBlackNWhite(string image_path, float threshold)
{
Bitmap SourceImage = new Bitmap(image_path);
using (Graphics gr = Graphics.FromImage(SourceImage)) // SourceImage is a Bitmap object
{
var gray_matrix = new float[][] {
new float[] { 0.299f, 0.299f, 0.299f, 0, 0 },
new float[] { 0.587f, 0.587f, 0.587f, 0, 0 },
new float[] { 0.114f, 0.114f, 0.114f, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { 0, 0, 0, 0, 1 }
};
var ia = new System.Drawing.Imaging.ImageAttributes();
ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(gray_matrix));
ia.SetThreshold(threshold); // Change this threshold as needed
var rc = new Rectangle(0, 0, SourceImage.Width, SourceImage.Height);
gr.DrawImage(SourceImage, rc, 0, 0, SourceImage.Width, SourceImage.Height, GraphicsUnit.Pixel, ia);
}
string bw_path = "C:/Users/Bruce Huffa/source/repos/DevelopOCR/DevelopOCR/test_bw.png";
SourceImage.Save(bw_path);
return(bw_path);
}
private static Image ConvertColorMatrix(Image SourceImage, float[][] ColorMatrix, float Threshold)
{
Bitmap work = new Bitmap(SourceImage);
using (System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(work))
{
var ia = new System.Drawing.Imaging.ImageAttributes();
ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(bw_matrix));
ia.SetThreshold(Threshold); // Change this threshold as needed
var rc = new Rectangle(0, 0, SourceImage.Width, SourceImage.Height);
gr.DrawImage(SourceImage, rc, 0, 0, SourceImage.Width, SourceImage.Height, GraphicsUnit.Pixel, ia);
}
return(work);
}
private void btn_prikaziSliku_Click(object sender, EventArgs e)
{
//otvara se dialog openFile i izabere se slika (*.bmp|*.jpg|*.png) i prikaze se u PictureBoxu pb_slika
Stream stream = null;
openFile.InitialDirectory = "C:\\";
openFile.Filter = "Bitmap (*.bmp)|*.bmp|PNG (*.png)|*.png|JPEG (*.jpg, *.jpeg)|*.jpg; *.jpeg";
openFile.FilterIndex = 3;
openFile.RestoreDirectory = true;
openFile.Title = "Odaberite sliku za prikaz na displeju.";
if (openFile.ShowDialog() == DialogResult.OK)
{
try {
if ((stream = openFile.OpenFile()) != null)
{
Bitmap slika = new Bitmap(openFile.FileName);
Bitmap smanjenaSlika = Konverzije.Resize(slika);
using (Graphics gr = Graphics.FromImage(smanjenaSlika)) {
var gray_matrix = new float[][] {
new float[] { 0.299f, 0.299f, 0.299f, 0, 0 },
new float[] { 0.587f, 0.587f, 0.587f, 0, 0 },
new float[] { 0.114f, 0.114f, 0.114f, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { 0, 0, 0, 0, 1 }
};
var ia = new System.Drawing.Imaging.ImageAttributes();
ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(gray_matrix));
ia.SetThreshold(0.7f); // Change this threshold as needed
var rc = new Rectangle(0, 0, smanjenaSlika.Width, smanjenaSlika.Height);
gr.DrawImage(smanjenaSlika, rc, 0, 0, smanjenaSlika.Width, smanjenaSlika.Height, GraphicsUnit.Pixel, ia);
}
niz = Konverzije.ConvertToByteArray(smanjenaSlika);
var image = Konverzije.ConvertToBitmap(niz);
pb_slika.Image = image;
toolStripStatusLabel1.Text = "Uspješno učitana slika.";
btn_posaljiSliku.Enabled = true;
}
} catch (Exception ex) {
toolStripStatusLabel1.Text = "Greska: nije moguce učitati datoteku. [" + ex.Message + "]";
}
}
}
public static Image BlackWhite(this Image Image, float threshold)
{
Bitmap SourceImage = new Bitmap(Image);
using (Graphics gr = Graphics.FromImage(SourceImage)) // SourceImage is a Bitmap object
{
var gray_matrix = new float[][] {
new float[] { 0.299f, 0.299f, 0.299f, 0, 0 },
new float[] { 0.587f, 0.587f, 0.587f, 0, 0 },
new float[] { 0.114f, 0.114f, 0.114f, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { 0, 0, 0, 0, 1 }
};
var ia = new System.Drawing.Imaging.ImageAttributes();
ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(gray_matrix));
ia.SetThreshold(threshold); // Change this threshold as needed
var rc = new Rectangle(0, 0, SourceImage.Width, SourceImage.Height);
gr.DrawImage(SourceImage, rc, 0, 0, SourceImage.Width, SourceImage.Height, GraphicsUnit.Pixel, ia);
}
return(SourceImage);
}
public void Transform(IModel app)
{
Bitmap bitmap = app.Image;
using (Graphics gr = Graphics.FromImage(bitmap))
{
var gray_matrix = new float[][] {
new float[] { 0.299f, 0.299f, 0.299f, 0, 0 },
new float[] { 0.587f, 0.587f, 0.587f, 0, 0 },
new float[] { 0.114f, 0.114f, 0.114f, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { 0, 0, 0, 0, 1 }
};
var ia = new System.Drawing.Imaging.ImageAttributes();
ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(gray_matrix));
ia.SetThreshold(0.8f);
var rc = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
gr.DrawImage(bitmap, rc, 0, 0, bitmap.Width, bitmap.Height, GraphicsUnit.Pixel, ia);
}
app.Image = bitmap;
}
private void panelPreview_Paint(object sender, PaintEventArgs e)
{
if (_preview == null)
{
e.Graphics.Clear(Color.FromKnownColor(KnownColor.AppWorkspace));
return;
}
using (Graphics g = Graphics.FromImage(_preview))
{
g.Clear(Color.FromKnownColor(KnownColor.AppWorkspace));
var gray_matrix = new float[][] {
new float[] { 0.299f, 0.299f, 0.299f, 0, 0 },
new float[] { 0.587f, 0.587f, 0.587f, 0, 0 },
new float[] { 0.114f, 0.114f, 0.114f, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { 0, 0, 0, 0, 1 }
};
var ia = new System.Drawing.Imaging.ImageAttributes();
ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(gray_matrix));
// ia.SetThreshold(0.2f); // Change this threshold as needed
float t = sliderAlpha.Value / 100f;
ia.SetThreshold(t); // Change this threshold as needed
g.DrawImage(
_selection,
new Rectangle(0, 0, (int)txtWidth.Value, (int)txtHeight.Value),
_topX,
_topY,
(int)txtWidth.Value,
(int)txtHeight.Value,
GraphicsUnit.Pixel,
ia);
}
//e.Graphics.Clear(Color.FromKnownColor(KnownColor.AppWorkspace));
//if (_source == null)
// return;
//var gray_matrix = new float[][] {
// new float[] { 0.299f, 0.299f, 0.299f, 0, 0 },
// new float[] { 0.587f, 0.587f, 0.587f, 0, 0 },
// new float[] { 0.114f, 0.114f, 0.114f, 0, 0 },
// new float[] { 0, 0, 0, 1, 0 },
// new float[] { 0, 0, 0, 0, 1 }
//};
//var ia = new System.Drawing.Imaging.ImageAttributes();
//ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(gray_matrix));
//// ia.SetThreshold(0.2f); // Change this threshold as needed
//float t = sliderAlpha.Value / 100f;
//ia.SetThreshold(t); // Change this threshold as needed
//e.Graphics.Clear(Color.Black);
//e.Graphics.DrawImage(
// _selection,
// new Rectangle(0, 0, (int)txtWidth.Value, (int)txtHeight.Value),
// _topX,
// _topY,
// (int)txtWidth.Value,
// (int)txtHeight.Value,
// GraphicsUnit.Pixel,
// ia);
}
