I have a pdf with 3 images
I want to find each image and replace it with another image
I saw in the pdf the original paths under xmpMM:Ingredients:
I tried to change it via notepad++ but it looks like the images are already embedded and changing the path does nothing.
How can I find each image and replace it with another image?
The xmp stuff is information only. The actual images are embedded streams in the pdf file. Finding the correct streams to replace and replacing them isn't a simple problem, and can't be done with notepad. You'll need a library / toolkit that can modify PDFs, like https://pdf-lib.js.org/ or similar.
The PDF file looks like an Illustrator file, which adds another layer of weirdness - Illustrator can write PDFs that have both PDF and Illustrator versions of the content, and you see one in Acrobat and the other in Illustrator.
It's probably easier to recreate the PDF from whatever source produced it.
I am generating invoices with TCPDF and everything is working fine. The pdf files need to be printed onto letterhead paper. I couldn't find any information on this, but is it possible to set a "letterhead" paper type in the pdf document so that when printed it will automatically choose the tray with letterhead paper (of course, the printer has the ability to set what kind of paper is in which tray)?
If you have a look at the examples provided on the TCPDF website, there seems to be a few things there about page preferences and a possible solution to your tray problem.
Have a look at:
Print Preferences
and
Advanced Page Settings
Seems pretty interesting, looks like there maybe some built in functions that will automatically choose the tray based on the size of the PDF.
Hope this helps, good luck.
I would like to know if its possible to convert a PDF to and image without fonts. My goal is to have only the image without text ?
And if yes, can I do it with ImageMagick/GhostScript ?
Here an example
The image final http://crocodoc_public.s3.amazonaws.com/8b8aa154-45e3-41f9-a465-628e1b2e955d/images/page-001.png
and the original PDF http://crocodoc.com/demo/efwpa (page 2) We can see that the text are on overlay over the image, what I want is to do the same.
So if I got you right, what you want is to remove some text from your PDF (not fonts), and you want to do it programmatically. I suspect you know already that this will only possible if the text is placed on some kind of separate layer in your PDF files. You can try to utilize iText for that. Beware, this will mean you will have to invest some days of learning how to use that library.
I too am the lookout for something like that.
While playing with imagemagick I tried this a command and got some unexpected results.
convert -input.pdf -blur 0x0 output.jpg
this removes the text layers from the pdfs I tried.
I cannot guarantee that this will work for you and if this the right way to achieve, but you may try.
You can do that with Adobe Acrobat. Select the text with the touch up tool and delete it. I don't think you can do that with Ghostscript. You could consider editing the PDF by hand (qpdf helps).
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).
I'm creating a program to generate PDF files in VB.Net.
Everything is working fine except that the image is being displayed with a blue background while the image provided doesn't have any.
Following are the lines of code being used:
sColor = IIf(mvarEncodeASCII85, ToASCII85(ImgColor),
(System.Text.Encoding.GetEncoding(1252).GetString(ImgColor)))
What am I doing wrong?
There is not alot of details, but my first thougt is that it is .png-files or .gif-files.
Am I correct? In that case it may be an issue with adobe acrobat handling the transparent backgrounds.
As I said it's hard to say exactly without any further details.