In this “Color Detector” application, firstly we select an image (jpeg,
bmp, png etc.) and then we pick the color which we want to detect on that
image. If we found the color, we display a confirmation message. The snapshot
for the running application is below:
Source of the image: We can take mage from any source (like Digital
Camera, any stored image in PC, Mobile etc.), and keep the image somewhere in
our system. Image can be in any format (i.e. jpeg, bmp, png etc.)
Image Selection:
For image file selection, we include an “OpenFileDialog” control into our form.
On “Choose Image” button click, we show “OpenFileDialog” to choose any image
file from the system. After image file selection, we get the file path and then
load the image into a picture box. For the file selection and loading into a
picture box, refer to following code:
private void ChooseImageBtn_Click(object sender, EventArgs e)
{
try
{
//Clearing previously selected image from picture box
ImagePathLbl.Text = "";
pictureBox1.Image = null;
//Showing the File Chooser Dialog Box for Image File selection
DialogResult IsFileChosen = openFileDialog1.ShowDialog();
if (IsFileChosen == System.Windows.Forms.DialogResult.OK)
{
//Get the File name
ImagePathLbl.Text = openFileDialog1.FileName;
//Load the image into a picture box
if (openFileDialog1.ValidateNames == true)
{
pictureBox1.Image = Image.FromFile(ImagePathLbl.Text);
}
}
}
catch (Exception exc)
{
MessageBox.Show(exc.Message);
}
}
Color Selection:
For color selection which we want to detect in our selected image, we include
an “ColorDialog” control into our form. On “Pick Color” button click, we show
“ColorDialog” to choose any color from the dialog box. After color selection,
we get the color name and then display the picked color into a panel by setting
Panel.BackColor property to picked color. If the picked color is a known color,
we also display the color name in text. For the color selection and displaying
the selected color, refer to following code:
private void PickColorBtn_Click(object sender, EventArgs e)
{
try
{
// Clean previously selected color
SelectedColorNameLbl.Text = "";
panelSelectedColor.BackColor = actualColor;
//Showing color choice
DialogResult IsColorChosen = colorDialog1.ShowDialog();
if (IsColorChosen == System.Windows.Forms.DialogResult.OK)
{
panelSelectedColor.BackColor = colorDialog1.Color;
//If it is know color, display the color name
if (colorDialog1.Color.IsKnownColor == true)
{
SelectedColorNameLbl.Text = colorDialog1.Color.ToKnownColor().ToString();
}
}
}
catch (Exception exc)
{
MessageBox.Show(exc.Message);
}
}
Color Detection:
For color detection, firstly we convert the loaded image in picture box to a
“BitMap” class. Refer to following MSDN link for more detail:
http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.aspxThen we iterate each pixel of image and get the pixel color. We store the each pixel color into a temporary variable named “now_color”. Get the 32-bit ARGB value of this “now_color” (a Color Object) with 32-bit ARGB value of our “Picked Color”. If both values are same, we display a “Color Found!” message and come out from the iteration, otherwise we keep on looking other pixel until we cover whole image. If we don’t get success in color finding, we show “Selected Color Not Found" Message. For the color detection, refer to following code:
private void DetectColorBtn_Click(object sender, EventArgs e)
{
try
{
Boolean IsColorFound = false;
if (pictureBox1.Image != null)
{
//Converting loaded image into bitmap
Bitmap bmp = new Bitmap(pictureBox1.Image);
//Iterate whole bitmap to findout the picked color
for (int i = 0; i < pictureBox1.Image.Height; i++)
{
for (int j = 0; j < pictureBox1.Image.Width; j++)
{
//Get the color at each pixel
Color now_color = bmp.GetPixel(j, i);
//Compare Pixel's Color ARGB property with the picked color's ARGB property
if (now_color.ToArgb() == colorDialog1.Color.ToArgb())
{
IsColorFound = true;
MessageBox.Show("Color Found!");
break;
}
}
if (IsColorFound == true)
{
break;
}
}
if (IsColorFound == false)
{
MessageBox.Show("Selected Color Not Found.");
}
}
else
{
MessageBox.Show("Image is not loaded");
}
}
catch (Exception exc)
{
MessageBox.Show(exc.Message);
}
}
C# developmentthanks for the solution of this problem, i was looking for this....
ReplyDeletei have problem with replace color in image
ReplyDeletei want if color found then it replace selected color where they detected