I perform a screen capture and get an image with a text in it. Let consider the text in the image to read - 'Hello'.
Now, I would like to 'create' an image from text 'Hello' which has all the same properties (font style, size, pixel format..) as the text - Hello from my captured image.
I'm using the following code to convert the string - Hello to an image.
string str = "Hello";
Bitmap bmp = new Bitmap(74, 16, PixelFormat.Format32bppArgb);
using (Graphics gfx = Graphics.FromImage((Image)bmp))
{
Font font = new Font("Tahoma", 11, FontStyle.Regular, GraphicsUnit.Pixel);
gfx.FillRectangle(Brushes.Transparent, new RectangleF(0, 0, bmp.Width, bmp.Height));
gfx.FillRectangle(Brushes.Black, 0, 0, 74, 16);
gfx.DrawString(str, font, new SolidBrush(Color.White), 1, 1);
bmp.Save(#"C:\temp\" + str + ".bmp", ImageFormat.Bmp);
}
The two images (one from screen capture, and second from creating) are not the same.
How do I create an image with text which would match exactly to the image with text from the screen capture ?
Here is the code I use to screen capture from the third party application....
Rectangle rect = new Rectangle(194, 41, 74, 16);
using (Bitmap bmpScreenShot = new Bitmap(rect.Width, rect.Height))
{
using (Graphics gfxScreenShot = Graphics.FromImage(bmpScreenShot))
{
gfxScreenShot.CopyFromScreen(rect.Left, rect.Top, 0, 0, bmpScreenShot.Size, CopyPixelOperation.SourceCopy);
gfxScreenShot.Dispose();
MemoryStream imageStream = new MemoryStream();
bmpScreenShot.Save(imageStream, ImageFormat.Bmp);
bmpScreenShot.Save(#"c:\temp\pic1_0.bmp");
}
}
I assume you're trying to implement an OCR. I've never tried anything like it, and can imagine it get's quite complicated. You might want to check out other (open-source) OCRs, like:
OCR in the Cloud, by Microsoft
Tessnet2
Related
I am trying to generate a BMP file that has some text. I created a winform application and I can succesfully create the BMP (I displayed it on a picture Box with no problems). However when I save it to a file, I just got a black image.
My code is
private void btnNameUsage_Click(object sender, EventArgs e)
{
Bitmap bmp = new Bitmap(width, height);
string name = "Hello how are you";
string date = DateTime.Now.Date.ToString();
Graphics thegraphics = Graphics.FromImage(bmp);
string complete = date+"\n"+name ;
using (Font font1 = new Font("Arial", 24, FontStyle.Regular, GraphicsUnit.Pixel))
using (var sf = new StringFormat()
{
Alignment = StringAlignment.Center,
LineAlignment = StringAlignment.Center,
})
{
thegraphics.DrawString(complete, font1, Brushes.Black, new Rectangle(0, 0, bmp.Width, bmp.Height), sf);
}
picBoxImage.Image = bmp; //THIS WORKS
//thegraphics.Flush();//I am not sure this is necessary and it changes nothing anyway
bmp.Save(#"theImage.bmp",ImageFormat.Bmp);//I tried only one argument but it gave a png file. Now only a black BMP
}
What am I doing wrong here?
The reason why PNG works and BMP doesn't is that PNG allows transparency in the image. In BMP the transparent parts of your image are rendered black (since it has to drop the alpha channel). Your text is also using a black brush, so you will get a black image.
For on-screen rendering this is not an issue, since there, transparency is supported.
I want to combine two image but I cant success . Help me please.
When try the combine PictureBox show only first image but there is not second image , when I remove first image I can see second image.
Also I tried setting first image and draw the text on image that's also not working. Please help.
Image myimg = Code128Rendering.MakeBarcodeImage(textBox1.Text, 2, true);
Bitmap image = new Bitmap(myimg.Width + 20, myimg.Height + 50);
pictureBox1.DrawToBitmap(image, new Rectangle(0, 0, myimg.Width + 20, myimg.Height + 50));
Bitmap bmp = new Bitmap(myimg.Width + 20, myimg.Height);
Bitmap bmp2 = new Bitmap(myimg.Width + 20, 20);
Graphics Cizgi2 = Graphics.FromImage(bmp2);
Graphics Cizgi = Graphics.FromImage(bmp);
Cizgi.DrawImage(myimg, 0, 0);
FontStyle sitil = FontStyle.Bold;
Font fonts = new Font(new FontFamily("Arial"), 10, sitil);
Cizgi2.DrawString(textBox1.Text, fonts, Brushes.Black, 5, myimg.Height + 10);
Graphics g = Graphics.FromImage(image);
g.DrawImage(bmp, new Point(10, 0));
g.DrawImage(bmp2, new Point(0, bmp.Height + 10));
I want to image seems like first but i cant make
It looks like you are trying to concatenate two images vertically? It's pretty simple actually, you can look here (C# image concatenation), but I've also modified it for your needs. I think this should work:
float drawBorderX = 5;
float drawBorderY = 5;
//Set up our two images
Bitmap barCode = Code128Rendering.MakeBarcodeImage(textBox1.Text, 2, true);
Bitmap text = new Bitmap(barCode.Width, 50);
Graphics textGraphics = Graphics.FromImage(text);
//Draw the text to the bottom image.
FontStyle sitil = FontStyle.Bold;
Font fonts = new Font(new FontFamily("Arial"), 10, sitil);
textGraphics.FillRectangle(new SolidBrush(Color.White), new Rectangle(0, 0, text.Width, text.Height));
textGraphics.DrawString(textBox1.Text, fonts, Brushes.Black, drawBorderX, drawBorderY);
//Vertically concatenate the two images.
Bitmap resultImage = new Bitmap(Math.Max(barCode.Width, text.Width), barCode.Height + text.Height);
Graphics g = Graphics.FromImage(resultImage);
g.DrawImage(barCode, 0, 0);
g.DrawImage(text, 0, barCode.Height);
Edit: Note that resultImage will contain the image you want, so you can set your PictureBox to be that image at the end.
I want to take a screen shot of full code from visual studio single file.
is it possible?
if yes, how?
print to something like a PDF writer? or 'Microsoft Office Document Image Writer'?
Think that would be the way to go.
You can try this
File
Print
Select Printer Name as Microsoft XPS Document Writer
Press OK
To support colors, you can paste the code into an enormous RichTextBox (or regular-sized with NumericUpDowns to control width and height) and have a button that will do:
var bitmap = new Bitmap(this.richTextBox1.Width, this.richTextBox1.Height);
this.richTextBox1.DrawToBitmap(bitmap, new Rectangle(Point.Empty, bitmap.Size));
bitmap.Save("code.bmp");
Legacy (doesn't support colors):
var allCode = "...copy all of the code into here";
var font = new Font("Arial", 13);
SizeF size;
using (var g = Graphics.FromImage(new Bitmap(1, 1)))
{
size = g.MeasureString(allCode, font);
}
var bitmap = new Bitmap((int)size.Width + 20, (int)size.Height + 20);
using (var g = Graphics.FromImage(bitmap))
{
g.DrawString(allCode, font, Brushes.Black, 10, 10);
}
bitmap.Save("code.bmp");
You can use this:
Bitmap BmpScreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
Graphics ScreenShot = Graphics.FromImage(BmpScreen);
ScreenShot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);
string file = "C:\\test.jpg";
BmpScreen.Save(file, System.Drawing.Imaging.ImageFormat.Png);
is necessary: using System.Drawing;
I want to plot points over an image that are a bit transparent. As in I'm able to see over what area are they present. Is there any way on C# .net platform to do so.??
Thanks.
This is one way to do it.
Image bitmap = new Bitmap(100, 100); // sample image, load your real image from file here
using (var g = Graphics.FromImage(bitmap))
{
g.FillRectangle(Brushes.Red, new Rectangle(0, 0, bitmap.Width, bitmap.Height)); // Just to fill the background on the sample image, remove this
var transparentColor = Color.FromArgb(127, Color.Blue); // Create a semitransparent color
using(Brush brush = new SolidBrush(transparentColor))
{
// Create the dot
g.FillEllipse(brush, new Rectangle(10, 10, 25, 25));
// Create another dot
g.FillEllipse(brush, new Rectangle(25, 15, 25, 25));
}
}
myPictureBox.Image = bitmap; // display the image in an Imagebox (optional, you might use your image somewhere else)
I'm trying to create an image with a transparent background to display on a web page.
I've tried several techniques but the background is always black.
How can I create a transparent image and then draw some lines on it ?
Call Graphics.Clear(Color.Transparent) to, well, clear the image. Don't forget to create it with a pixel format that has an alpha channel, e.g. PixelFormat.Format32bppArgb. Like this:
var image = new Bitmap(135, 135, PixelFormat.Format32bppArgb);
using (var g = Graphics.FromImage(image)) {
g.Clear(Color.Transparent);
g.DrawLine(Pens.Red, 0, 0, 135, 135);
}
Assumes you're using System.Drawing and System.Drawing.Imaging.
Edit: Seems like you don't actually need the Clear(). Just creating the image with an alpha channel creates a blank (fully transparent) image.
This might help(something I threw together which sets the background of a Windows form to a transparent image:
private void TestBackGround()
{
// Create a red and black bitmap to demonstrate transparency.
Bitmap tempBMP = new Bitmap(this.Width, this.Height);
Graphics g = Graphics.FromImage(tempBMP);
g.FillEllipse(new SolidBrush(Color.Red), 0, 0, tempBMP.Width, tempBMP.Width);
g.DrawLine(new Pen(Color.Black), 0, 0, tempBMP.Width, tempBMP.Width);
g.DrawLine(new Pen(Color.Black), tempBMP.Width, 0, 0, tempBMP.Width);
g.Dispose();
// Set the transparancy key attributes,at current it is set to the
// color of the pixel in top left corner(0,0)
ImageAttributes attr = new ImageAttributes();
attr.SetColorKey(tempBMP.GetPixel(0, 0), tempBMP.GetPixel(0, 0));
// Draw the image to your output using the transparancy key attributes
Bitmap outputImage = new Bitmap(this.Width,this.Height);
g = Graphics.FromImage(outputImage);
Rectangle destRect = new Rectangle(0, 0, tempBMP.Width, tempBMP.Height);
g.DrawImage(tempBMP, destRect, 0, 0, tempBMP.Width, tempBMP.Height,GraphicsUnit.Pixel, attr);
g.Dispose();
tempBMP.Dispose();
this.BackgroundImage = outputImage;
}