I am generating PDF documents using DevExpress XtraReports.
I am using the same image over and over (in rows of status lights).
The PDF generated seems to duplicate the image definition for each image included. I would prefer if it included the image once and referenced it wherever it needed another copy - this would drastically reduce the size of my PDF docs.
Is there any way to achieve this using DevExpress or even post processed via a third party application. Any help is appreciated.
Two options:
OPT1: I suppose your image is a background or a company logo and the image is the same on all the pages of the pdf. If yes, then create the pdf without the image. Post-process the pdf and add the image on all the pages (you can do that using itext/itextsharp or pdflib).
OPT2: take your actual pdf and convert it using Ghoscript. Using Ghsoscript you can do a "pdf to pdf" conversion. During the conversion Ghostscript try to identify repeated images and removes them. The resulting file is smaller. (Ghostscript is not always able to do that... try with you pdf file).
It is possible to re-use the same image content in multiple locations throughout your document. But it's a fair bit easier to do this while adding the image(s) to the PDF.
I'm not sure if DevExpress supports this.
Related
Currently, I can extract all the text chunks with their location data from a PDF. The problem is that the PDF contains images with text annotations which I do not want including in the extraction.
However, for whatever reason whenever I search the PDF for images, it only finds 1 of the images and usually throws the exception: The colour space is not supported. It's as if it doesn't recognise them as images?
I am not wishing to extract the images, just locate where they start and end in relation to the PDF so I can exempt the text that is on top of the images.
For example:
Where the numbers on the graph are unwanted and need to be removed from the extracted text.
Im just not sure how to:
A) Locate all the images and store the coordinates of where it starts and ends
B) Ignore the text that is on top of the images in the PDF document
(I am using iTextSharp to try and achieve this, but so far I am not having much luck)
I'm not exactly sure how iTextSharp works but the PostScript language reference or the PDF Reference manuals may be a good place to start figuring out what you need to know.
I just cracked open a PDF file in a text editor to check out the format because I haven't seen it in a while and then realized what the problem might be.
PDFs support "Images", and "Stream Objects" which can contain image data. Stream objects actually declare enough information that you can know where they begin and end and write something to manually ignore them.
A Stream Object Header looks like this:
<</Intent/RelativeColorimetric/Subtype/Image/Length 19678/Filter/DCTDecode/Name/X/Metadata 4314 0 R/BitsPerComponent 8/ColorSpace 5247 0 R/Width 290/Height 372/Type/XObject>>stream
It's entirely possible that your particular PDF has only one "Image" and then the rest of it is "Streams".
I suggest cracking it open to take a look. It would also be beneficial if you included some sample code with on the library you're using.
I also found by opening a PDF in a text editor this string /Type /Page which seems to create new pages, so you there's a chance you could count those to determine which page you're currently on.
The header at the top of the document I'm reviewing is %PDF-1.2 and the latest version is 1.7, so there may be some disparity here because of that.
Any chance you can share the PDF file you're working with?
I have prevented my program from saving images downloaded as files. (They are saved in Image variables instead). However, my application is slowed down significantly because the PDFsharp libraries save the image files anyway before drawing them to the PDF document. This is done deep within a hierarchy of calls by its functions.
Is there a simple fix to get around this?
JPEG images are simply copied into the PDF file, all other image formats have to be converted to the PDF format. AFAIK PDFsharp does not save the images to the local file system, however they are saved into a memory stream during the conversion.
There is a simple fix to get around this: write a better conversion and submit it to the PDFsharp team.
I think PDFSharp always need to save first. It cannot handle byte image that will used to import an image. I recently encountered it when I also coded and used pdfsharp. My process is to save an image then import to code in pdfsharp. I have a part that I need to delete all temporary images.
I got quite complicated ready pdf file. It has got barcode and fancy looking table.
I have to create based on it application which will generate pdfs that will look the same but contain different records in the table and different barcode.
Is it possible to copy existing pdf and just change content of barcode and table ?
What would be the best approach to create the same looking pdf but with different content ?
Whank You very much for help
If the barcode and table are static I would open it in photoshop or illustrator delete everything I dont want, Then save it as a pdf again. Then follow this guide iText - add content to existing PDF file and use it as a template to put my custom content in.
If the table and bar code are dynamically generated (each one is different) and you need to crop out content on the fly I would pull some hacky crap and draw white squares over all the content I want gone. then proceed to use it as a template.
Just my 2 cents given the information provided.
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.
Using WKHtmlToPDF to generate PDFs for my company's web-based mapping service.
Essentially, I take a template HTML file, inject an image into a div, save the HTML to disk and use WKHtmlToPDF to render to PDF.
Now, on most templates it works a treat. On one particular one though, where the image should be (int the pdf) is a grey area. HOWEVER, if I right click on the grey area, and select "Save Image As...", the saved image is correct.
Linked are the created PDF and the HTML on which it is based. Help required most urgently, and hints appreciated.
Zip File Containing HTML and PDF
I was having an issue where a particular image was not being printed to the PDF. Other images on the same page were. The src of the missing image is from a CDN, but had no extension, i.e. src="\\path/to/image?param". Using the aforementioned -n switch (disable Javascript), the image shows up in the resulting PDF. Thanks Jordaan.
Don't know WHY this worked, but adding the "--disable-smart-shrinking" option, and/or removing the "-n"(Disable Javascript) option, fixed it.