I need to extract the positions of all images from a pdf-file on the Mac. For now I am considering PDFKit, but that if there is a better way of doing that, i'm open to suggestions.
So the question is, how can i parse a PDF file on the Mac, receiving (images, not necessarily), their positions within a page and page numbers using PDFKit or, probably, another library or even a program (I don't have to build it into my program, i just need it done).
UPD Seems like it is possible to do that using Adobe's Acrobat SDK.
Thanks in advance,
Timofey.
Related
I am using prawn to generate pdf files which have lots of images so they come out quite large. I can open the file in Adobe Acrobat and then save it using the "reduce file size" option, and a 164MB file shrunk to 7MB and retained all of the image quality. I would like to replicate this compression in Ruby. I have tried using the compression settings which prawn offers and they have not had any effect on the file size. I suspect there must be a way to do it with RMagick, but I haven't figured it out yet.
I apologize for not including any code samples showing what I have tried, but I removed the prawn compression settings when they didn't have any effect, so I don't have anything to show.
Have you tried simply making a copy of the PDF with RMagick? That is, read in the PDF and write it back out again.
Also, check with the ImageMagick folks at https://www.imagemagick.org/discourse-server/. Any advice they offer you can be implemented via RMagick.
I need to work on multiple PDF files and because of annotating those files, I prefer to use Preview built-in app for Mac OSX.
If I am in the middle of one PDF file say on Page 5, and I transit to some other PDF file and come back to the previous file, then I always get the first page of that PDF.
Is there any setting which I can use so that I always get the page from where I left?
Not sure what the problem is, mine works as you seem to want it to. Maybe your Preferences are set differently. Here are mine.
I'm wondering how it possible to extract images from .swf viewer?
Note that .swf file have not images itself.
For example I'm trying extract images from AVON catalogue from this link - http://avon.com.ua/PRSuite/eBrochure.page?index=1&cmpgnYrNr=201404&pageNo=0
Any ideas?
Best way is to put the .swf file in a decompiler for image extraction. Decompilers are smart enough to extract images for you and arrange them.
JPEXS Free Flash Decompiler is a more popular one
http://www.free-decompiler.com/flash/
You can extract other useful content from it as well.
Just download the .swf file from the website
A while back (like around 1999) I wrote a set of tools for Flash animations.
One of the tools is swf_dump which can be used to extract objects (i.e. write the objects in a form of script that sswf can nearly recompile...)
The tool also allows for extracting images that are inline (not downloaded dynamically by the flash animation, if so, anyway, you could as well download those images manually, you'd need the URL, though.)
The command line you can use is:
swf_dump -d my-animation.swf
Then your current folder will be littered with all the images that were found in the flash file. It extracts JPEGs and PNGs. The source can be compressed (SWF or CWF are supported.)
Now, you're on your own to compile that thing... The project is here and is in great need of updating (but Flash is kind of going out too...)
https://sourceforge.net/projects/sswf/
Has anyone come up with a way to make thumbnail type previews for matlab figures in windows?
I'm getting tired of saving a .png along with the .fig file just so I know what was in it.
A useful helper for this would be a command line utility for windows that can be provided with an image file and told to use that as the basis for the preview for a given file.
I could write a helper function in matlab that saved the .fig, made a temporary image file, then pushed that into the thumbnail using the command line utility.
You can write a function in C++ that tells Windows how to generate thumbnails from your file.
This link explains about it. Check out the section about Thumbnail Image handler. This is the function that you will need to implement.
From what I managed to understand, the procedure is this:
Write a in-process COM server (DLL) that implements IThumbnailProvider interface
Put the DLL file somewhere on your computer.
Write an entry to the registry, by using the procedure described in this page.
That still leaves you with the problem of thumbnail extraction from .fig file. As far as I know, fig files are nothing but mat files. I am fairly sure that it is possible.
You will need a custom save function for all figures. It will print a thumbnail of the image (by using the print command), and save it inside the figure.
I know that it isn't much information, but it can help you to get started. You might as well ask someone who is highly proficient in COM technology for more help. Thus, I recommend adding a COM tag to the question.
Edit(1) - I've found a good tutorial on the subject:
I am currently writing an application working with specially prepared image data. Another tool prepares the images (basically PNGs with additional data stored in the meta-data section). Now my tool works with these files, but not with all PNGs, so "we" decided to use a different file extension. So far, so good.
Now, because I am a lazy sack I implemented some file type registration to allow double-clicking on the file and opening it in my application (no problem at all).
And here is my Question:
It would be cool if the windows explorer could still show me the thumbnail previews for my files. Since they basically are still PNG files, it should be possible without writing my own shell extension (at least I believe so).
I quickly tried to copy all registry keys and values from HKCR.png to HKCR.mInDat (my file name ext) and it worked. However, I would prefere knowning what I am doing ;-)
Which of the registry settings are responsible for the thumbnail preview control and which can I use to get the preview for my file types?
I tried to google it, but I failed, since it seems I am unable to come up with the right buzz-words to find the info I need. Please, help me.
Thank you!
Yours,
3of4
Simple:
[HKEY_CLASSES_ROOT\.apng]
#="apng"
"Content Type"="image/png"
"PerceivedType"="image"
[HKEY_CLASSES_ROOT\apng\shellex\{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]
#="{3F30C968-480A-4C6C-862D-EFC0897BB84B}"