Develop Reference

Using libpng in C#

if you want to save the image in PNG format you can use ImageFormat class of .Net.
But this class doesn't implemented compression for PNG files.
And for some reasons i can't save my file in JPEG format.
After Some researched i know libpng is the official PNG reference library.
But i can't find anything for using it in .net framework.
Does anyone know about this library and using it in .NET?
About libpng
Thanks in Advanced.

Another alternative: PngCs
But this class doesn't implemented compression for PNG files
What on earth does that mean? PNG is compressed by design.

ImageMagick is a very nice library that allows you (among other things) create PNG files.
Magick.NET is the .Net wrapper for this library. Using this library, you can simply convert/create image formats. E.g. from their documentation:
using (MagickImage image = new MagickImage("Snakeware.gif"))
{
image.Write("Snakeware.jpg");
}

Since libpng it's written in C ( ANSI C, even better ) you can build a bridge between that library and your C# application -> Use a C library from C# code
There are also other options, such as freeimage and the port of ImageMagick to .net but in this case it's still unclear to me what kind of project is this one, I don't get if it's official or not, if it's already dead or alive, if you are interested you can search for that name.
In simple terms PNG it's a open standard where JPEG it's a world full of patents and royalties, for this reason some libraries do not offer jpeg features or they offer a limited set of jpeg related features/algorithms. PNG it's also a real imaging standard about a file format definition, jpeg it's more like a container.

DirectShow .Net camera capture encode output?

recently i have started workin on project of my own which is capturing a camera output using DirectShow .Net. There are few problems that i don't know how ot solve
1) How can i encode the captured stream into H.264 format.I understand i should some how add filter in the filter graph. But i wasn't able to find where and how . Also i was not able to find if there is standart H.264 filter or should i download it form some where? If i need to download it can it just be a dll to wich i add reference or should it be installer?
2) Is there a way to save the captured output into a memory object, some kind of stream or it can only be written to file?
Best Regards,
Iordan

You're can use commercial software from VisioForge or Viscomsoft.
AForge potencial problem - no audio during capture, only video. Also output formats is a very limited. But - it's free and open source, if you're have any DirectShow experiense you can add audio support.

You will need to use something like FFMpeg or Handbrake. Check out http://vidcoder.codeplex.com/.
AForge also has some video editing abilities and you can also pass filters to it. There are also several FFMpeg C# wrappers you could use such as https://github.com/crazyender/FFMPEG.net
You should use AForge.net. All of the hard work is done for you already. Use VideoFileWriter http://www.aforgenet.com/framework/docs/html/4ee1742c-44d3-b250-d6aa-90cd2d606611.htm. I appears that the AForge framework uses FFMpeg under the hood as well (See AForge.Video.FFMPEG namespace). You just create a writer and pass it the bitmap/frame writer.WriteVideoFrame(bitmap);
You should fully investigate the video abstractions in AForge. You could save yourself considerable amounts of time.
Example: http://www.aforgenet.com/framework/samples/video.html

1) Yes, You should download encoder filter library. Most of decoders are supplied with free. But encoder is not. If you don't want to pay, you have to find open source Encoder.
And To use at the graphedit program, you should do dll register with that dll file. Or the installer program do this instead. And you also need to check container type like mp4, mkv... In other words you need mux filter to save that in a file. I think someone will link available urls. Sorry I don't have urls now.
2)What is that the means of capture? Is that Movie? or Image?
In case of Image, There are many sample projects and SampleGrabbers. You can save it to both of a file and memory.
In case of Movie, I'm sure your pc memory is not enougth to them with out encoding. Make memory stream and pass it to capture manager.
You can also make a filter in order to customize filter to your needs. All of information are included in Windows SDK samples.

Edit tif files with C#

I need to create a program that reads tif files from a directory and then trims the bottom inch of the file and resaves the file. I know how to open the files but how would I automate this process from c#?

If you need to handle TIFF images in C# then have a look at LibTIFF.Net
http://bitmiracle.com/libtiff/ - It is open source and Native .NET component and free for commercial use.
This library should also have the TIFF cropping functions you need. I am not sure if the native .NET libraries can handle all of the TIFF functions you may require whereas LibTIFF will.
The original LibTIFF for C/C++ can be found at http://www.remotesensing.org/libtiff/ which may help you with documentation and support if needed.
Included with libTiff is a program called tiffCrop which should also have source code. http://www.remotesensing.org/libtiff/man/tiffcrop.1.html which can be accessed via
http://www.remotesensing.org/libtiff/tools.html.

See here.

.NET Tiff Issues C#

I'm having issues with TIFFs
Here is what I have to do, we have tiff images saved into the database, these images are CCITT4 compressed with a number of required tags, these include:
RowsPerStrip must be the ImageLength
Photometric Interpreation must be MinIsWhite
Multi-strip image format is not allowed
My problem is, I'm using the built in System.Drawing.Bitmap/Image objects, which happen to change the values of these when I put it into the object, I've tested this by saving the byte[] to a tiff directly from the database, checked the tags, they are fine.. but when i put the bytes into an Image object then save to file, they are modified.
To make things worse, I'm needing to add a text to the image before saving it.
So I need a component that will allow me more control with TIFF (and they must be tiff), and be able to add text to an image or be able to use the Graphics object.
I've tried using LibTiff but I have yet to see any examples on how to use this component,
any suggestions?

You can use our free and open-source LibTiff.Net library for this. It is freely available for all uses under a BSD license. The just released version 2.0 contains good documentation and number of samples.
There are samples that show how to convert any non-tiled TIFF image to the TIFF image which have all data written in a single strip and how to convert a System.Drawing.Bitmap to 1-bit CCITT single strip TIFF image.

I have never used the built int System.Drawing.Bitmap objects to do this. I personally use LeadTools, but it isn't free. It is however a robust and fairly straightforward API. I primarily use it for GEOTiff which contain specific data tags for image location data.
There is a 60 day evaluation if you would like to try it out.

I use FreeImage. There's a C# .NET wrapper available too.

The IEvolution component set from HiComponents is now totally free (no source) - http://www.hicomponents.com. A very powerful .NET imaging toolkit.

How to load EPS files and draw them using WinForms

Is it possible to load and display EPS file using plain WinForms GDI+? If not, is there a free library to help out?
I seem to remember that Windows GDI supported EPS files, but after Googling around a bit, I am starting to doubt that memory.
All I want to do is load the file and draw it using a Graphics context.
I am aware that I can just use any program to convert the file to PNG or something and render it that way, but because I am trying to render at multiple resolutions, I would prefer to keep the vector data in the EPS file.
Thanks!

All the free or open source libraries I know that can convert EPS to other vector or raster format are all based on Ghostscript. You can invoke ghostscript directly, with wrapper provided or alternatively look at imagemagick. It is a very popular library for manipulating image graphics and has been around for a long time. It also internally relies on Ghostscript for handling EPS format. There is a .NET wrapper for it that you can find at http://imagemagick.codeplex.com/. You can read a bit about its background here too http://www.codeproject.com/KB/dotnet/ImageMagick_in_VBNET.aspx. There is also pstoedit that is also based on ghostscript to read EPS and allow export to format like WMF. You will need to the call to pstoedit API using interop in .NET
Besides Ghostscript there are several commercial products that I known of like ImageGear and LeadTools which will let you take EPS to almost any other kind of graphic formats.

You can use GhostScript to produce images from an EPS. Once you have an image you can then display that within your application.

In your question you indicated you want the output in a vector format which would preclude bitmaps, jpeg etc. Here are a couple of ways of getting a XAML file which is a vector file with extensive support by Microsoft.
Microsoft Expression Blend 3 and Design 3 can both open .ai (eps) files and convert them to vector formats, design and XAML respectively, so it is definitely possible.
I know it is relatively easy to automate most Microsoft Office applications like Word and Excel, but I have not seen any documented com inter-op assemblies for these Expression products.
Perhaps you can use the converters that are part of Expression in an undocumented way?
If that doesn't work here is plan B:
Here is a free converter that will convert .ai (eps) files to XAML. To use it you need Adobe Illustrator however.