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Adobe Acrobat 9 Tutorials

Reducing PDF File Size / Using Acrobats PDF Optimizer pt. 2




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Now, the Images Category by far is the most complex, I think, but it gives you the most amount of control over your PDF files, especially if your files are like mine and they have a whole lot of images inside of them. So here's the deal. I'll try and break this down nice and simple for you. We have three areas. We have Color Images. Below that we have Grayscale and below that we have Monochrome Images. A monochrome image is an image that's made up of solid black and solid white, like a fax or something like that, maybe a floor plan. I don't now. I don't really use monochrome images very often so I'm really not even going to think about this area here. I don't have any monochrome images inside my document so I'm going to forget about that. But I may have some grayscale images and I know for sure I have color images. Let's focus on color images and basically what I tell you about the color images area, you can apply to the grayscale area. OK. So first of all I'm going to pop open this menu here, my Downsample Menu and what I can choose is what's called in Photoshop, at least, the Interpolation Method. What that means, I know that sounds scary, what that means is what method, what system do I want to use to recalculate the pixels inside my images? So this ties right into mathematics as a matter of fact. How do we want to recalculate or rework the pixels inside our images? I'm going to give you the short and sweet though. Bicubic is going to give you the best quality but it's going to take the longest to process. Subsampling is the worst quality or the lowest quality but it processes the fastest and then Average, as I'm sure you can guess, is right down the middle. That's an average resampling method. So if you know a little bit about this or you're a Photoshop user, you know exactly what I'm talking about. If you're using Acrobat more in an office environment, contract and things like this, I really wouldn't get hung up on this. This can get really murky and really technical. I'm trying to give you the gist here. But this can really get complex. So myself, I'm going to leave this on Bicubic now and how this works is it almost reads like a sentence. So it says use bicubic to resize images down to 160 pixels per inch, ppi; that's a unit of measurement, a unit of quality, for any graphic, for any picture that's above 225 pixels per inch. So in other words, we could crank this up maybe to 300 if we wanted to or I could bring this down to, I don't know, 175 or something like this, right? You can always adjust your numbers. Put that back where it was. So I hope that makes sense. Use this resampling method to resize any image that's above 225 down to 150. I hope that works for you. What compression type you want to use? You can either use JPEG or Zip. I'm going to stick with JPEG and what quality would you like to use? Minimum, Low, Medium, High or Maximum? So again, if a lot of this is over your head or if this is way off the deep end for you, maybe just monkey around with this menu here. You might be sitting here going I have no idea what resampling is. I have no idea what pixels per inch is. Well, just come in here to your Quality Menu and I'm going to try switching from Medium to Low and you know, I'm going to do the exact same thing for my grayscale images; Medium to Low. That's the only change I'm going to make here. Alright. I'm ready to roll here so I'm going to click on OK. Right away Acrobat wants me to save my file so I'm going to call this Chapter 5 Layout underscore Optimized. There we are. I'll save this guy up. Acrobat goes to work reducing the file size. Alright, let's go check out our files size. I'm going to go back to the File Menu, down to Properties. Remember, our original file was 3.8 I think it was and you know, we're at 3.7. That really didn't have an impact on my file size. I'm going to click on OK here and maybe I will scroll down to that graphic on the third page here, zoom in on him. Really did not have an impact at all. My quality looks just fine inside this graphic here, aside from the thumbnails inside the screen shot, but the actual screen shot itself looks just fine. But there you go. There's the Optimizer. Of course, I could go back into Advanced and then down to the PDF Optimizer and continue fiddling around with these Graphic Options here. Maybe I could try instead of Bicubic, going to Average for example and test my results. You're really going to have to test and fiddle with your PDF files to see what kind of effects you're going to have on your files. And the good news is that Acrobat always brings up that Save As Dialog Box so you will never be overwriting your original document. Alright, there's the PDF Optimizer.

Tutorial Information

Course: Adobe Acrobat 9
Author: Geoff Blake
SKU: 33985
ISBN: 1-935320-40-8
Release Date: 2009-04-10
Duration: 7 hrs / 106 lessons
Work Files: Yes
Captions: Available on CD and Online University
Compatibility: Vista/XP/2000, OS X, Linux
QuickTime 7, Flash 8

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