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Acrobat ships with a wide variety of preflight profiles, and preflight is just trying to find out what's wrong with this picture. So under the Prepress topic, I'm going to choose Magazine Ads. Now I could choose Analyze and Fix, but I'm just going to choose Analyze. And when I choose Analyze and set Acrobat in motion, it finds a lot of problems. First of all, it says it's not compliant with PDF/X-1a, although that doesn't mean that it wouldn't image correctly, but it just feels compelled to tell me that.
But now I see some things that I know are going to cause problems. It says that I have low-resolution images. So when I click on the little triangle next to that error entry, then I can find out which images are causing the problem. When I click on this little icon, nothing happens until I press Show in Snap, and I realize Show in Snap doesn't make any sense until you find out that this is called the Snap View. So as I click on one of the other icons, I'll see the other images causing a problem. This is nothing that I can fix in Acrobat, I have low-resolution image content.
So either the original image was low resolution or perhaps the PDF was made with a setting that downsampled the image so that it's not appropriate. So I can't fix this here but at least I know what the problem is and I can communicate back to the creator of this file and hopefully they can fix the problem. But there is another issue that people often want to fix, and this is going to require me to create my own preflight profile. So here I have a PDF that has the trim marks, bleed marks, all the page information, and I want to just trim it off just to the very trim.
So again nothing built into Acrobat that will do this but I can fix this myself by creating what's called a Fixup. So this third little icon up here that looks like a little wrench that gives you the list of built-in fixups I know you tend to think of fixing as being separate from preflighting, but in Acrobat's mind they all fall under the same topic. So under Options here, I'm going to tell Acrobat I want to create a new preflight fixup, and I'll just call this CroptoTrim, and what I need is under the Pages topic, so in this left-hand column I choose Pages and then I'm going to scroll all the way around and choose Set page geometry boxes.
So this only works if the application that created this PDF put in their information that identifies where the trim is and where the bleed is. It's not just that it's visible to us, it's actually invisible information in the PDF that identifies those edges. So what I want Acrobat to do is crop this page at that TrimBox, and the way you tell it that is backwards I think from your logic, so the source, in other words what I want to have controlled is my CropBox. The destination, which to me is the source, is the TrimBox.
So I'm going to say that I wanted to crop it off to where the trim is indicated internally in the file. Yes, I know this is backwards but just remember that it's backwards and that'll help you when you try to make your own fixups. When I click OK, now I just have the recipe but I haven't run it yet. So there's my new little CroptoTrim fixup that I made, when I press the Fix button, it's going to ask me where I want to save this because it's going to make a permanent modification to the file. And when it's done, look, it's trimmed it off to trim.
So do keep in mind that this only works if the PDF has the trim area correctly identified within the PDF. But InDesign and Illustrator both do that. So remember that preflight can help you find problems that would be hard to find by just looking at the file, and fixups can fix some problems, and both of those together can save you some time.
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