I'm able to scan a JPG image using Tesseract, I'm able to scan a regular PDF using ITextSharp and get the text from those. But I can't find a way to either get the text from a scanned PDF with a .PDF extension, or convert a PDF to an image so I can then scan it with Tesseract. Are there any options that I'm missing? Thanks!
Assuming that you have scanned the PDF document. Secondly assuming you have only text in the PDF document. You can generate an image from text from the following method
private Image DrawText(String text, Font font, Color textColor, Color backColor)
{
//first, create a dummy bitmap just to get a graphics object
Image img = new Bitmap(1, 1);
Graphics drawing = Graphics.FromImage(img);
//measure the string to see how big the image needs to be
SizeF textSize = drawing.MeasureString(text, font);
//free up the dummy image and old graphics object
img.Dispose();
drawing.Dispose();
//create a new image of the right size
img = new Bitmap((int) textSize.Width, (int)textSize.Height);
drawing = Graphics.FromImage(img);
//paint the background
drawing.Clear(backColor);
//create a brush for the text
Brush textBrush = new SolidBrush(textColor);
drawing.DrawString(text, font, textBrush, 0, 0);
drawing.Save();
textBrush.Dispose();
drawing.Dispose();
return img;
}
Reference: How to generate an image from text on fly at runtime
Related
I'm developing an Winforms application to be used for Led displays. The Led display is size 64x32. I created a test bitmap image with 4 cells size 64x16, so I can output it it to the LED display.
When the user enters 4 numbers in the input form, those Strings are then converted to Bitmap Image and placed inside the cells. I somehow got it to work with this method; It edits the same bitmap image, inserts the numbers, and saves it into a new bmp (or am I wrong?).
public static Bitmap Convert_Text_to_Image(string txt, string fontname, int fontsize)
{
//creating bitmap image
Bitmap bmp = new Bitmap("cells.bmp");
//FromImage method creates a new Graphics from the specified Image.
Graphics graphics = Graphics.FromImage(bmp);
// Create the Font object for the image text drawing.
Font font = new Font(fontname, fontsize);
// Instantiating object of Bitmap image again with the correct size for the text and font.
SizeF stringSize = graphics.MeasureString(txt, font);
bmp = new Bitmap(bmp, (int)stringSize.Width, (int)stringSize.Height);
graphics = Graphics.FromImage(bmp);
//Draw Specified text with specified format
graphics.DrawString(txt, font, Brushes.Red, 0, 0);
font.Dispose();
graphics.Flush();
graphics.Dispose();
bmp.Save("cells2.bmp", System.Drawing.Imaging.ImageFormat.Bmp);
return bmp; //return Bitmap Image
}
The output in the PictureBox is This
Now I've created myself multiple problems with the alignment, since I just pasted "bmp numbers" directly onto the "bmp cells"... is there a function of "mapping" the numbers correctly inside the cells, depending if its a single-digit or a two-digit number?
I'm pretty certain there's a way easier way to do all of this, maybe with the DataGridView? I only started using C#, any help would be appreciated.
The image "cells.bmp" is just a test image i created in Paint (xd), rather than that, I'm trying to write a function that will create the Bitmap cells through code
if (want_x_number_cells) {
//create bmp with appropriate number of cells
}
I am writing info entered on a web form into a tiff file. My issue is where the comment box comes into play for the web form. The comment box is multi-line and when writing it on to the tiff file, some of the information entered into the comment box falls out of the tiff image.
The code for how I am trying to write it to the tiff file:-
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(800, 1000); //Creates Bitmap
Graphics g = Graphics.FromImage(bitmap);
g.DrawString("Comment: " + CommentBox.Text, outputFont, Brushes.Black, new PointF(0, 700)); // Writing the text from the comment box on to the Tiff file.
so what that means to me is, if I am writing a multi line comment as:-
"Hello Testing.
Hello Testing again and again and again and again and again and again and again.
Hello Testing again and again and again and again and again and again and again. Hello Testing again and again and again and again and again and again and again."
My tiff-file captures line elements only upto the 1000 width, the elements beyond that width do not automatically get generated in a new line.
Can anyone help me with this? ideas?
Try something like this - you can use the overload of DrawString that takes a containing rectangle, and the text should wrap within that:
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(800, 1000); //Creates Bitmap
using(Graphics g = Graphics.FromImage(bitmap))
{
RectangleF rect = new RectangleF(new PointF(0, 700), new SizeF(200,200)); // adjust these accordingly for your bounding rect
StringFormat drawFormat = new StringFormat();
drawFormat.Alignment = StringAlignment.Near;
g.DrawString("Comment: " + CommentBox.Text, outputFont, Brushes.Black, rect, drawFormat); // Writing the text from the comment box on to the Tiff file.
}
Any ideas how to save a string with any font as an svg image?
I mean we can write a string to an image and save it, something like this:
Bitmap bitmap = new Bitmap(1, 1);
Graphics graphics = Graphics.FromImage(bitmap);
//..
graphics.DrawString(myString, myFont, /*...*/);
bitmap.Save(#"somewhere");
Can I save a string with a font as svg image too?
I can't seem to get the text I've written to show up on my image Here's the code I'm using
//Creates a bitmap with the path to the current image
Bitmap LabelImage = new Bitmap(dtImages.Rows[intCurrentImage]["ImageURL"].ToString());
Graphics graphic = Graphics.FromImage(LabelImage);
graphic.DrawString("Hello", new Font("Tahoma",40), Brushes.Azure, new System.Drawing.Point(0,0));
//put Image that I just created and put the text on into an Infragistics UltraPicureBox
picImage.Image = LabelImage
You did not update your original image (LabelImage), so why should the text you added to the Graphics object show up?.
From MSDN, Graphics.FromImage:
Creates a new Graphics from the specified Image.
(emphasis mine)
After you have added the text, you need to save the changes:
graphic.Save();
Unrelated to your question, you should really put the creation of the Graphics object in a using statement, to ensure proper disposal:
using(Graphics graphic = Graphics.FromImage(LabelImage))
{
// use graphic here
}
I just tried this
Bitmap bitmap = new Bitmap("C:\\Untitled.png");
Graphics g = Graphics.FromImage(bitmap);
g.DrawString("Hello", new Font("Tahoma", 40), Brushes.Azure, new System.Drawing.Point(0, 0));
pictureBox1.Image = bitmap;
and it works fine for me. Just try to pick a contrasting brush.
I'm trying to build a treeview like file list in a richtext box.
It should look like an explorer treeview. My code is able to get an resize the icon, but the transparency is missing (light gray background instead of transparency). What do I need to change here? Is the Image format wrong?
Is there a better way to add an image to a richtextbox?
// Get file info
FileInfo f = new FileInfo("myfile.name");
// Get icon for fileinfo
Icon ico = Icon.ExtractAssociatedIcon(f);
// Convert icon to bitmap
Bitmap bm = ico.ToBitmap();
// create new image with desired size
Bitmap img = new Bitmap(16,16,PixelFormat.Frmat32bpRgb);
// Create graphics with desired sized image
Graphics g = Graphics.FormImage(img);
// set interpolation mode
g.InterpolationMode = InterpolationMode.HighQualityBiCubic;
// draw/resize image
g.DrawImage(bm, new Rectangle(0,0,16,16), new Rectangle(0, 0, bm.Width, bm,Height), GraphicalUnit.Pixel);
// Paste to clipboard
Clipboard.SetImage(bm);
// Paste in RichtextBox
rtb.Paste();
Example:
Edit:
I've figured out that the image is transparent, but using Clipboard.SetImage() doesn't publish it as transparent image.
Any ideas why and what can I do to fix it? Do I need to switch to a differn textbox control?
I've had some luck going through Graphics.
Bitmap b = new Bitmap(pbAssetLoaded.Width, pbAssetLoaded.Height);
using (Graphics g = Graphics.FromImage(b))
{
g.DrawIcon(SystemIcons.Information, 0, 0);
}
This draws the icon with transparency to the Bitmap.
Try
img.MakeTransparent();
after you contruct it.
Note that this will change your PixelFormat to Format32bppArgb.