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  #8  
Old 04-23-2009, 09:57 AM
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Martin_Doudoroff Martin_Doudoroff is offline
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Re: Making sharp pdfs

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Originally Posted by KevinCarter View Post
Martin,
thanks,
my designer is making pdf portfolios for me in In design. They are very blurry and out of focus. She has to compress them to make the viable to email. That said, even the less compressed versions look blurry as well. I'm opening them in Acrobat or Preview. any ideas?
Ok, I just ran a simple test with InDesign CS3:

I exported a photo from Lightroom at native resolution as a TIF file. The resulting file is 2869x2867 and 23.6MB.

Next, I created a new letter-size document in InDesign and placed the image. In the layout, the image is about 7.5" x 7.5", which is large.

Next, I chose File/Export and chose "Adobe PDF" for the format.

In the ensuing dialog-from-hell, I chose the "[High Quality Print]" preset, with Standard: "None" and Compatibility: "Acrobat 5 (PDF 1.4)".

Then I went to the Compression panel and deliberately set the following in the Color Images section:
- Bicubic Downsampling to 300 ppi for images above 450 ppi
- Compression to "JPEG"
- Image Quality to "High"
Note that this means my image is not going to be rescaled by InDesign, because my native image is around 380 dpi at 7.5" width.

Then I hit the Export button and got this 972KB PDF file. (This file would be a LOT smaller if my image wasn't 7.5" wide.) But is it sharp? Let's do some pixel peeping:



Answer: yes, with caveats:
  1. The images are not identical in scale because the TIF on the left is at 100% pixel-to-pixel and the PDF on the right is zoomed on image data spatially mapped on an explicitly dimensioned page (7.5")
  2. Because the PDF has dimensions, we're no longer "looking at pixels" like we are on the left side: the pages is being resampled for display (and there's virtually no way around this: it's a PDF)
  3. Consequently, zoomed in like this, the photo is not quite as sharp as the TIF original
  4. It shouldn't matter, because we're pixel peeping

  


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  #9  
Old 04-24-2009, 04:16 PM
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Noel_Carboni Noel_Carboni is offline
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Re: Making sharp pdfs

I do not even see the above degradation. I have Acrobat set to generate "Press Quality" output.

What is your quality setting?



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  #10  
Old 04-24-2009, 04:57 PM
DougAxford DougAxford is offline
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Re: Making sharp pdfs

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Originally Posted by Noel_Carboni View Post
It's utterly ridiculous in this day and age of high speed networking not to be able to pass around files of tens or even hundreds of megabytes.-Noel
I agree but the reality is far different. I've had 3 cases lately when I had to email a set of images to commercial clients (not nearly that large either) and in each case, the email came back as undeliverable - too large!! One was to a net publisher who wanted full size pdf's. I had to break each into smaller chunks to get past their isp restrictions.

There's a lot of problems in getting the internet up to 21st century standards.

I don't want to even get into the issues we have with Joe Public and the ineptness we encounter regularly. Hint: Hit Control+C to copy the link - I don't see a key labeled Control - Ctrl - Oh, I never knew that

And I always thought the joke about the pop-out coffee cup holder on the computer was just made-up. Not anymore.

DougA

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  #11  
Old 04-24-2009, 07:21 PM
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Martin_Doudoroff Martin_Doudoroff is offline
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Re: Making sharp pdfs

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There's a lot of problems in getting the internet up to 21st century standards.
BING! You are a winnah!

As a backbone, the Internet itself is what it is. As you point out, the real issue here is computer literacy. What's killing us all on an epic scale are poor computer literacy and poor tools.

There's no solution to computer literacy other than education. Marketing companies like Microsoft, Apple and Adobe have been pimping the idea for years that their latest crappy software will make everything so easy that real computer literacy will be optional, but that's all wishful thinking.

Most computer users learn a small set of behaviors: elementary web browsing and searching (for porn) with whichever web browser came with their computer (IE for the majority), running Microsoft Orifice (which should have been taken out back and shot over ten years ago but is as ubiquitous today as ever and wasting incalculable man hours daily), checking their email (increasingly through their web browser), vacuously installing viruses on their computer, and loading pirated music onto their iPods. The scale of dysfunction simply cannot be overestimated, and it defies imagination. Nearly anything that deviates from the above leads to utter paralysis (dial-the-nerd-closest-to-you-for-a-walkthrough-to-be-followed-and-immediately-forgotten).

As for tools, we're mainly crippled by our own momentum. Our email network is a spam-clogged joke, and email software stopped evolving in any meaningful way over a decade ago. The email network could be fixed, but the perceived inertia has so far been perceived as too overwhelming to overcome. So instead we all suffer with what we've got.

The web—as defined by the one universal media component—HTML—is intractably broken: the only actual solution is to rip it up and start over, but so far, nobody has exhibited the vision to lead us out of that mess. (Adobe has sort of tried to do so in a slimy way with their Flash-based platform, but that will never be anything more than a niche player because it's too proprietary and, ultimately, too retrograde.)

Interestingly, the one thing that the web is turning out to be quite good at is web services, which boils down to passing little chunks (and sometimes big chunks) of information around, but the broken front-end—the HTML disaster, the decrepit Windows platform, the anarchic Linux platform and the obscure Mac platform—is crippling web services from getting good. The end result is that the most interesting web services are only used by relatively sophisticated users. For example, the PDF I linked to a couple posts above is hosted on a very cool web service called Dropbox, but it's the sort of thing only nerds know about. At the moment, my educated guess is that mobile platforms like the iPhone are what are going to drive the evolution of web services for the next few years, specifically because they're better at delivering a transparent user experience than personal computers and—tah dah—their operating systems and development tools are new and not loaded down with old baggage.



I apologize for subjecting you all to that rant.

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  #12  
Old 04-24-2009, 07:29 PM
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Martin_Doudoroff Martin_Doudoroff is offline
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Re: Making sharp pdfs

Quote:
Originally Posted by Noel_Carboni View Post
I do not even see the above degradation. I have Acrobat set to generate "Press Quality" output.

What is your quality setting?
It is possible to embed a completely lossless image in a PDF, although that is still subject to (somewhat) unpredictable interpretation at the receiving end.

I didn't use "Press Quality" because that would not have yielded a file that would have passed through email.

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  #13  
Old 04-25-2009, 12:02 AM
KevinCarter KevinCarter is offline
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Re: Making sharp pdfs

Martin, yes thank you for reading the thread carefully. The whole point is to email these out. I sent your words to the designer and she is looking it over. Will report back.
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  #14  
Old 04-25-2009, 11:19 AM
DougAxford DougAxford is offline
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Re: Making sharp pdfs

Quote:
Originally Posted by Martin_Doudoroff View Post
I apologize for subjecting you all to that rant.
I nominated you for 'post of the month', OK, 'rant of the month' - well said.

The bottom line on this thread is what I run into constantly - great __________ (designer in this case) but lacks a full understanding of the tools needed to get the proper job done. It's much worse when I work with schools. I'm always walking the line between trying to educate them without having them realize they are so inept.

I reading admit that I'm inept, no problemo.

Short story: I shot a Native school recently. They insisted that the class photo have the native names on it with the correct diactritic (accents). Great but I'll need you to email me the list and the correct font. I get the stuff, install the font, names are wrong. Hmm. After an hour of working things out with the secretary, she finally admits that she has no idea how to 'create' the special characters with the font and just sent me the info without.

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