Is there any way to use the OpenXML library to automatically create a thumbnail image for a PPTX file? I am building a small C# ASP.NET web application that is used to build PPTX files from a library of PPTX files. One of the requirements is to show a thumbnail image for each PPTX file in the library. I would like to automate this as the people that will be using the system don't know how to create screen shots.
Pptx file already have it, unziping the file you can find id. ;)
There's a commercial library available that can generate thumbnails of slides in presentations. So at least you know it's possible: http://www.aspose.com/docs/display/slidesnet/Creating+Slides+Thumbnail+Image
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In my C# WPF application the user have the possibility to import pictures.
Currently the source of the image is referenced to the picture path.
When the picture will be deleted or moved, then my reference is not valid anymore.
How is it managed in applications like Word or Photoshop? Is it possible to embed
the picture at runtime in my custom file? Or should these files copied to a
"image database"?
In Microsoft Word (docx) format. When you paste images in the document, it saves them as file(s). Try this:
Rename the .docx to .zip extension
Extract the zip archive
Now, navigate to the following and you can see all the embeded images here:
You can do something similar for your app. Without knowing the full context and design details its difficult to answer where should the images go.
Generally speaking, images should/could be co-located with the rest of the data that image compliments.
I want to perform OCR on png and pdf files.I am able to get Tesseract 3.0.2 .net wrapper work for png files but I can't find any class in it for PDf files.So, does it work for the pdf files.If not then please let me know any other open source library for scanning pdfs. My requirement is scanning diagrams in a pdf for specific circles, and creating hyperlinks for those circles.
No, it doesn't. You'll have to extract the images from the pdf first. This can be done using pdfimages pdfimages.exe -j your.pdf or gs as suggested by Zakk Diaz.
I have about 400 ebooks, all in PDF format, and my task is to extract the cover from every one of them (which is the first page of every PDF) and export them all as separate image (PNG or JPEG) files
So I will end up with 400 ebooks and 400 images of their covers.
I have Windows
Any advice greatly appreciated.
Use ghostscript to render tiff or jpg from the pdf. You have fine grained control over the result.
If this is a commercial application, you need a commercial license. If you use the application commercially, but inside your organisation, you are allowed to use the GPLed version of ghostscript.
Ghostscript can be found here. The PDF interpreter in many opensource packages relies on the gs PDF interpreter. Imagemagick for example, requires ghostscript libraries.
Download GS here: http://ghostscript.com/download/gsdnld.html
Use C# Process class to execute Ghostscript, there is a SO topic on this here How to run a C# console application with the console hidden
The commandline for tiff will be:
D:\gs\gs9.20>bin\gswin64c.exe -sOutputFile=d:\some%02d.tiff -dBATCH -dNOPAUSE -sDEVICE=tiff24nc -sCompression=lzw -r150 -sPageList=1 d:\PDFReference.pdf
This will create one some01.tiff file on d:\ in 150dpi resolution.
The following thread is suitable for your request. converting pdf file to an jpeg image
One solution is to use a third party library. ImageMagick is a very popular, freely available too. You can get a .NET wrapper for it here. The original ImageMagick download page is here.
http://www.codeproject.com/KB/library/pdftoimages.aspx Convert PDF pages to image files using the Solid Framework
http://www.print-driver.com/howto/convert_pdf_to_jpeg.html Universal Document Converter
http://www.makeuseof.com/tag/6-ways-to-convert-a-pdf-file-to-a-jpg-image/ 6 Ways To Convert A PDF To A JPG Image
And you also can take a look at this thread: how to open a page from a pdf file in pictureBox in C#
If you use this process to convert a PDF to tiff, you can use this class to retrieve the bitmap from tiff.
Is there any simple way to open and display multipage .tif files? I want to write a simple winForm application to open multiple page .tif file and scrolling around these pages? I want to add next and previous buttons to my project to scroll around them. Any suggestions or examples?
Try the free DotImage Photo SDK by Atalasoft. Though it is not open source, it is free and a very good choice for viewing images.
Meanwhile I will have a look if AForge.Net and EmguCV can open Multipage TIFF images and let you know. These frameworks are open source and include very powerful SDKs for image processing.
I know an SDK named leadtools that has the ability to load and display multipage TIF files using .NET. For a sample code, see the following link:
http://www.leadtools.com/help/leadtools/v175/dh/to/leadtools.topics~leadtools.topics.loadingsavingtutorials.html
I need to create a software which will create print previews of the documents of following formats: the MS Office documents (.doc(x), .ppt(x), .xls(x)), images, .txt files and PDF files. I have made a working prototype using XPS files. So basically I do the following: I convert the office files to .xps using Office Automation and then I render the .xps documents to images. I simply create XPS files from images and .txt by adding text or an image to FlowDocument, then rendering it. But I have found out that there is no way to convert PDF to XPS fast (A document which has 600 pages takes more than 2 minutes to convert and this is totally not suitable). So I am stuck at this point. It seems that I should start over again, using the different file format. Should I rewrite my program using PDF, for example, or is there any other way to accomplish my task? And if I should use PDF, could you, please, suggest me a good PDF C# library to render previews of pages as fast as possible? I tried using Websupergoo's ABCPdf, but it is too slow, because it does not allow me to render the previews to System.Windows.Media.Imaging.BitmapSource, only System.Drawing.Bitmap, so I have to convert Bitmap to BitmapSource and it takes up a lot of time.
Thanks in advance.
Use Ghostscipt to convert PDF to images. Though, I don't know why you wouldn't just use the PDF. I have used GhostScript for a number of PDF/Image manipulation tasks.
http://www.wibit.net/blog/integrating_ghostscript_c
Ghostscript will output any PDF to images to the settings you specify. I think you can use it as a DLL or as a commandline process.