Is it impossible to generate a PDF from HTML source as one single long paper? Since now if the content exceeds the A4 (for instance) paper height, it moves content to the next page.
I'm 90% sure that you can't do anything preemptive except guesstimate the size of the resulting PDF, which is not reliable.
I would generate the PDF and then use pdftk (or similar tool) to check how many pages were generated. Based on that, you could run wkhtmltopdf with the --page-height option set to something higher than an A4 and loop this process until you have the desired one page output.
Tedious, but the only reliable way.
Does anybody know if there is a way to check whether a list of Adobe Acrobat .pdf files contain rotated text (any text not at 0 degrees)?
I thought this would be simple, but I'm struggling to find an answer.
I am using ABBYY Recognition Server to OCR thousands of files and the results are quite poor where the text is rotated. I need to get a list of files that have rotated text to allow me to perform some pre-processing on them.
I usually use iTextSharp for .pdf automation and modification but don't seem to be able to find anything for checking text rotation.
Thanks
You could achieve your goal by extracting all words from these PDFs and checking if any of the words is rotated.
I would recommend you to use a PDF library higher level abilities for the task. Docotic.Pdf library is a good choice (of course, I am one of the developers of the library).
Here is an articles that shows how to extract words from PDFs with extra info about their position etc.
Each extracted word comes in PdfTextData object. The PdfTextData contains IsTransformed property to check if word is rotated, scaled, and / or flipped. You can also analyze PdfTextData.TransformationMatrix for more information about the transformation.
I found there is a lot of tools available for breaking the Big PDF files into smaller one by splitting the original PDF file PAGE WISE.for example, if i have a 10 page PDF Document,then we can able to break the original pdf file into 10 pieces in page wise splitting.
But i want similar kind of tool that breaks the PDF file smaller than the Page wise splitting.That means,i need to split the PDF page into different documents based on any parameter like paragraph,section,element...
for example,
If my PDF file having 2 pages with 10 paragraphs then i would like to split the pdf file into 10 separate Pdf file based on paragraph parameter...
Also, I strongly believe pdf does not contain any structure like Open XML.But i also Suspecting
How the tools can able to break the pdf files in to small pdf files by splitting page wise? What kind of mechanism they are using for page wise splitting PDF File?
So, Is there any way to do my work? Please give me your valuable suggestion on this?
PDF is a vector based document description language. It's page based so in a way every page is independent from the next one. Splitting page wise is therefore pretty easy. Contrary to a raster image where you can extract small subsets independently in a pdf you have to render the whole page to know how a small subset looks like.
Say you have a Page (black) which contains a complex shaped object (here it is a line but it could be any text, shape, image, etc.) and you want to extract a subset (red). You would have to first find all the objects that produce visible output in the region of interest. Then you would have to modify them so they are rendered correctly (in this case calculate the green points from the blue points while preserving the shape of the object).
An easier approach would be to include the whole page and clip the viewing area to the dimensions of the region.
You could do this with pdfjam. Check the --trim/--offset/--delta command in conjunction with a custom paper size (Example 6,7 on the pdfjam website). You would still have to somehow calculate the coordinates of the region of interest though.
I'm working on a project that involves the Fannie Mae/Freddie Mac Uniform Appraisal Dataset. The specification requires that the embedded appraisal PDF file be first-generation.
I understand conceptually what a first-generation PDF file is (printing of a document directly to PDF, rather than a scanned copy or printed and scanned copy). However, I've done some research and haven't found anything that specifies the properties of a first-generation PDF that could be verified programmatically.
I found a product that allows one to check if a PDF contains text, images, or both: Apose.Pdf.Kit for .NET, but I'm looking for a way to program this myself, for budgetary and other reasons. Also, I'm not sure that determining that the file contains text will be sufficient to verify that it's first-generation.
Given that this is an industry requirement of a very large industry, I feel like someone must have already tackled this issue, but I'm having a hard time finding anything.
Thanks in advance for any help.
There is no way to know for certain if a PDF is "first generation". Technically, a scanned PDF is just a PDF that contains images and perhaps OCR'ed text on top of that. A "first generation" PDF could easily have the same characteristics, so you have to use some heuristics.
For example, a PDF that contains only images and invisible text (from OCR) is likely to be scanned, a PDF that has visible text or vector graphics is probably "first generation" (OCR for scanned PDFs works by overlaying invisible text on top of the original image, so that text selection works, but the original document's fidelity is preserved).
Open pdf, ctrl "f" type in Appraisal. If you have a hit for the word, you have a first generation apprsl. Rather, the dataset exist.
Is there a library/tool which would list all colours used in a PDF document ?
I'm sure Acrobat itself would do this but I would like an alternative (ideally something that could be scripted).
So the idea is if you have a very simple PDF document with four colours in it the output might say :
RGB(100,0,0)
RGB(105,0,0)
CMYK(0,0,0,1)
CMYK(1,1,1,1)
You could explore the insides with pdfbox, but you would have to write some code to find and catalog all those colors.
Most PDF tools have access to this information but no api to access it. You could take any tool and add it in
Apago PDFspy generates an XML file containing all kinds of metadata extracted from PDF files. It reports color usage including spot colors.
We recently added a function called GetPageColorSpaces(0) to the Quick PDF Library - www.quickpdflibrary.com to retrieve much of the ColorSpace info used in the document.
Here is some sample output.
Resource,\"QuickPDFCS2eb0f578\",Separation,\"HKS 52 E\",DeviceCMYK,0.95,0,0.55,0
Resource,\"QuickPDFCSb7b05308\",Separation,\"Black\",DeviceCMYK,0,0,0,1
Resource,\"QuickPDFCSd9f10810\",Separation,\"Pantone 117 C\",DeviceCMYK,0,0.18,1,0.15
Resource,\"QuickPDFCS9314518c\",Separation,\"All\",DeviceCMYK,0,1,0,0.5
Resource,\"QuickPDFCS333d463d\",Separation,\"noplate\",DeviceCMYK,1,0,0,0
Resource,\"QuickPDFCSb41cafc4\",Separation,\"noprint\",DeviceCMYK,0,1,0,0
Resource,\"Cs10\",DeviceN,Black,Colorant,-1,-1,-1,-1
Resource,\"Cs10\",DeviceN,P1495,Colorant,-1,-1,-1,-1
Resource,\"Cs10\",DeviceN,CalRGB,Colorant,-1,-1,-1,-1
Resource,\"Cs10\",Separation,\"P1495\",DeviceCMYK,0,0.31,0.69,0
XObject,\"R29\",Image,,DeviceRGB,-1,-1,-1,-1
Disclaimer: I work at Atalasoft.
Our product, DotImage with the PDF Reader add-on, can do this. The easiest way is to rasterize the page and then just use any of our image analysis tools to get the colors.
This example shows how to do it if you want to group similar colors -- the deployed example will only work for PNG and JPEG, but if you download the code, it's trivial to include the add-on and get PDF as well (let me know if you need help)
Source here:
http://www.atalasoft.com/cs/blogs/31appsin31days/archive/2008/05/30/color-scheme-generator.aspx
Run it here:
http://www.atalasoft.com/31apps/ColorSchemeGenerator
If you are working with specific and simple PDF documents from a constrained source then you may be able to find the colors by reading through the content stream. However this cannot be a generic solution.
For example PDF documents can contain gradients or transparency. If your document contains this type of construct then you are likely to end up with a wide range of colors rather than a specific set.
Similarly many PDF documents contain bitmapped images. Given that these will need to be interpolated to be displayed at different resolutions, the set of colors in a displayed PDF may be bigger or different to (though obviously broadly similar to) the embedded bitmap.
Similarly many PDF documents contain constructs in multiple color spaces that are rendered into different color spaces. For example a PDF might contain a DeviceRGB bitmap, a line in an ICC based CMYK color and a Lab based rectangle. The displayed version might be in sRGB for display or CMYK for print. Each of these will influence the precise set of colors.
So the only 100% valid answer is going to be related to a particular render of a PDF at a particular resolution to a particular color space. From the resultant bitmap you can determine the colors that have been used.
There are a variety of PDF libraries that will do this type of render including DotImage (referenced in another answer) and ABCpdf .NET (on which I work).