I have a book cover sent as a PDF which is according 5x8 dimensions, only that is does not have bleed and I need to add it. I am using Adobe InDesign CC 2015 and Adobe Photoshop CC 2015. How can I make it happen?
Create a document in indesign and place the pdf into the document, centered. The document must have bigger dimensions for the bleed. Then put whatever in the bleed that's necessary.
A better way would be to load the pdf file into Illustrator and add the bleed there. Color matching will be a lot more accurate that way. Especially if the pdf contains any vector artwork like outlined fonts. Make sure you've got the correct fonts installed.
If the pdf only contains bitmap images, you could import it into photoshop. Make sure you've created a new document with the needed dimensions and resolution. 300 to 600 dpi would be a good starting point. Usually type will not look clean and sharp when using photoshop since its working on a picture (bitmap). Illustrator or Indesign would make type much cleaner.
If it's possible to get the source files instead, that would be the preferred method. Even if you'd have to redo the artwork would be better to have the original source files/pictures/fonts etc.
I'm working with PDFClown and I'm trying to extract images from a pdf file. I use the example code provided by the source code that can be found at http://pdfclown.org.
ImageExtractionSample.java.
The problem is the images are negative and flipped horizontally. Does anyone know how to resolve this problem?
Check with other PDF files to see if other PDF files are also giving the rotated or flipped images. ImageExtractionSample.java is not checking rotation or matrix defined transformations for the image object but just writes the content to a file as is (so it will work for JPG images but not for CCIT encoded images for example).
So there are things to consider when you extract image from PDF:
image can be rotated using the attached transformation matrix (CTM);
image can be rotated/transformed as part of the form which is transformed;
image can be placed without transformation on a page but the page itself is rotated;
image may contain the overlaid Mask on top of it (and the Mask can be rotated and transformed);
JPG image is stored pretty much as is but there are other formats supported by PDF like CCIT compression, LZW compressed images etc;
But the general suggestion is that when you extract JPG image from PDF using PDFClown you should just flip and rotate extracted images like suggested on the SourceForge project discussion page.
if you could point to the particular PDF sample file then it would be easier to suggest the solution.
If you're on Windows then you may use this free PDF Multitool utility to compare non-transformed and transformed images from PDF using "Extract raw images (without transformation)" option in images extraction dialog.
Disclaimer: I work for ByteScout, the PDF Multitool utility is free for both commercial and non-commercial purposes.
I'm converting PDF to JPG with gs.
Does gs substitute embedded fonts? How exactly this works? Like if i embed all fonts that is used in PDF does gs still look for some substitution or can it use that embedded font data?
So does embedding fonts in PDF mean that all glyphs used in PDF with that font is being embedded and i don't need to have that font in my gs font path?
Thanks!
When you’re outputting a JPEG file, you’re in effect outputting an image. This means that Ghostscript renders the page as image, then compresses the image using JPEG (lossy – to prevent reduced legibility of the text, use a lossless compression format such as PNG instead; JPEG is basically only good for photography because lossless would be much too big there).
In a bitmap image, there are no fonts, only pixels – so, for text rendering (e.g. black text on a white page), Ghostscript will create a bitmap image consisting only of greyscale pixels (by means of anti-aliasing), then save that.
To be able to do that, Ghostscript must have access to the fonts at the time of PDF rendering and JPEG creation. This means that the fonts either must be installed on the system (and in your font path), or embedded in the PDF in the first place. They are not necessary to view the JPEG file.
Is there a way to crop polygon (irregular shapes) zones in PDF using GhostSCript.
No, you cannot use Ghostscript to do that.
But yes, principally you can do that in PDFs. The concept then is not called "trim" or "crop" but "clip". Clipping is a basic concept of the PostScript and the PDF graphic models.
There are related "operators" for clipping any graphic object in either page description language. Search for "PLRM.pdf" and for "PDF3200_2008.pdf" on the Adobe websites. They contain the official specifications for the two formats.
Then, for both languages/formats lookup the operators for "clipping path":
W and W* for PDF
clippath, clip and other keywords containing 'clip' for PostScript
If you want to clip irregular shapes from complete pages of existing PDFs, you have to create an additional PDF page which constructs an opaque area that has the irregular "hole" clipped into it. Then overlay the new page to the old one.
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).