Drawing Text on an Existing TIFF File

I'm using the latest version of your .NET tools.

I have an existing TIFF file and I want to draw some text on it and save it.  How do I do this?

TIA

After loading the image, you can use the CreateLeadDC method to get a
device context that can be used with Windows GDI methods to draw lines,
text, or images on the image.

You can also use the CreateGdiPlusGraphics method to create a GDI+ Graphics object for drawing.

Both methods have examples in the .NET 14 help file, which you can modify to draw text.

Edited by user Tuesday, December 6, 2016 1:33:27 PM(UTC)  | Reason: Not specified

I'm using C#.  Are both of the methods you descibed here available to me in this language?

Using the CreateGdiplusGraphics when processing 1000's of images slows everything down quite a bit.  Is this to be expected?

TIA

Yes they are both available to C# programmers.

Both CreateLeadDC and CreateGdiPlusGraphics methods are part of the
RasterImage class and each of them has a C# example in the help file.

There could be a performance hit when using these functions with large
image dimensions (width and height). If that is the case, you can work
around it by writing the text on a smaller blank image (e.g. filled with white color), then using the
CombineFastCommand class to move the text to the larger image.

Edited by user Tuesday, December 6, 2016 1:34:06 PM(UTC)  | Reason: Not specified

If you found a way of doing this, could you please post how you did it? If you have some code, it would be very helpful. I'm new on this and I would really appreciate it.

Thanks!

The solution is as Amin said.  You must use GDI+ functions to draw the text on the image.  To get a GDI+ Graphics object, you must call the RasterImage.CreateGdiPlusGraphics method.  For an example on converting to and from GDI+ images, see the LEADTOOLS .NET help file regarding the CreateGdiPlusGraphics method.  For code on drawing the text, check MSDN.

 

If you have a Document level or higher toolkit, you can use the LEADTOOLS annotation libraries to add text to the image.  For an example, see the LEADTOOLS .NET help file article regarding non-automated annotations.