Theres a way, using PHP exec and Image MagicK, to get the first PDF page and convert it to JPG?
To answer your question, you convert just the nth page page as follows:
convert file.pdf[n] output_file.jpg
Note that this is zero based, so for the first page you would want to use file.pdf[0].
If you wish to convert the entire file, you can do:
convert file.pdf output_file.jpg
And this will produce a bunch of files in the form of output_file-0.jpg, output_file-1.jpg, ..., output_file-n.jpg
There are many search results on SO already.
You have the choice between two duplicates:
ImageMagick/Imagick convert PDF to JPG using native PHP API using the PHP IM bindings
Imagemagick convert pdf to png using the command line.
Note that for this to work, you need Ghostscript installed along with ImageMagick. (I think this usually is the case.)
Related
I have a PDF where I need to rotate particular page in PDF.
I have used below command but it rotates all pages in that pdf
convert -density 300x300 -rotate 90 input.pdf result.pdf
Is there any way to rotate particular page ?
Thanks in advance
Using ImageMagick, you can rotate a particular page using the [pagenum] syntax after the filename like this:
convert document.pdf[3] -rotate 90 page3rotated.pdf
However, that will only extract that single page (i.e. page 3), rotate it and save it (and it alone) in the output file. Of course, you could extract ALL the pages, rotate the one you want and re-assemble your PDF, but I can't help thinking that there must be a better way with a different tool.
In general, you should be aware that ImageMagick will rasterise your PDF (so it is basically a picture) and that words/text will no longer be selectable as words/text when ImageMagick puts your PDF back together.
If you are using Linux, You may use PDFMod. This allows independent operations on given pages of the pdf file.
I have attached a screenshot below for demonstration purpose.
We have a system which is generating PDF files. But anyone can convert those files using online pdf to word converter. Is there any option available in Yii or PHP to stop this?
To prevent PDF from been converted into Word you may:
Set password that is required to view PDF - once password is shared - it can be removed
Convert PDF to images, then convert these images to PDF (using ImageMagick, Ghostscript) - recoverable using OCR.
Write your code that damages so-called CMAP(/ToUnicode dictionary) inside generated PDF so the copied text will not match the text that is displayed to viewer - but still recoverable using OCR.
Use the handwritten font for text that is drawn into image. Then these images are saved as JPEG and these JPEG files are converted into final PDF - not recoverable using OCR but can be recovered using HWR
Use vector drawing commands to draw your own letters line by line, so will look like letters but will not be recognized by PDF readers as text - still recoverable using human eye.
Finally, you may skip generating PDFs but instead print a physical document, make a hard cover for it and send by a physical post to your customers and suppose they are lazy enough not to remove the cover and scan you document page by page with OCR software.
To disable converting PDF in any other format you can use for example PDFTK command line, you can find it here
It will prompt a password when user try to print your PDF document (consider converting format is also a printing mechanism)
command line
pdftk source.pdf output destination.pdf user_pw password
So to use it in PHP do not forget to add PDFTK to your PATH environment variable, set access authorizations and restart your web server
EDIT
you can use shell_exec()
<?php
// ...
shell_exec('pdftk source.pdf output destination.pdf user_pw password');
?>
Any text in a PDF can be converted to any other textual format.
You may try rendering the information you want to put into PDF as an image, then insert the image into the PDF.
This way, when the PDF is read, the image data is gotten. Although this may still be converted into any format if the converter is persistent, it makes them do more work.
I have a text files which I'm trying to convert into images. I know how to do this with GD but I'm having trouble finding suitable functions with imagick/imagemagick.
you want annotateImage() there will be more than that you need to do like setFont() ,setTextAlignment() etc... but that should get you going
i am using Imagemagick for converting my .pdf file to .png images
but when i issue the command
$convert sample.pdf image.png
then it will convert all the pages of sample.pdf file to .png images but exactly i want to
convert a specific no. of pages(e.g. first 10 pages or page no.22 or 12 etc.)
then pleases suggest me a way to solve this issue.
and one more question is that:
when we view our .pdf files in google docs .pdf viewer then they are also in image format
but we can select and copy the text written on pages to the clipboard(simply select the text and press
Ctrl+c)
so how can i implement this so the users of my website can select the text form my images.
(there are already some discussion about it on stackoverflow but they are not very clear)
for i in {0..9} 11 21
do
convert "sample.pdf[$i]" "image_$i".png
done
Benoits answer is what you were looking for for slicing and converting a PDF in to images.
Alternatively you can use pdftk with the cat operation. This would get you the first 10 pages and generate a new sliced PDF for example.
pdftk YOUR.PDF cat 1-10 output SLICED.PDF
Regarding your second question about converting an image PDF to a PDF with text data the only way is to use a OCR tool like Tesseract for example.
The only problem is that those OCR tools are not always that exact. In other words sometimes they will not always be able to output what you read on that image.
Is there any way to convert a SWF to pdf using php. i mean the page has a button on the click it must export the swf contents in pdf.
One approach you could try is to use ffmpeg to convert the swf to a series of jpeg images, one per frame, using the 'image2' output codec (see this part of manual). Then you can select the appropriate frame and build a PDF with it using pdflib, fpdf or similar library.
I've noticed your question states using php, but I was pretty happy with this library:
AlivePDF. It's worth a try.