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If you‘re a designer working on print projects, you‘ve probably come across the term "bleed" before. But what exactly is a bleed in printing? Why are bleeds necessary? And how do you set them up properly in Adobe InDesign?
In this in-depth guide, we‘ll answer all those questions and more. Whether you‘re a beginner or a seasoned pro, you‘ll learn everything you need to know to master bleeds in your InDesign workflow. Let‘s dive in!
What is a Bleed in Printing?
In the world of print production, a bleed refers to graphics, images, or background colors that touch the edge of the page. More specifically, bleeds are elements that are intended to print beyond the final trim size, typically by 1/8" (0.125 inches) on each side.
Here‘s a simple visual:
[Insert diagram showing bleed area extending past trim]
The main purpose of bleeds is to avoid unprinted slivers of paper showing on the edges of the finished piece after trimming. Even with precision cutting equipment, it‘s virtually impossible to trim sheets perfectly each time. Extending artwork 1/8" past the final size provides a margin of error to ensure color goes right to the edge.
The History of Bleeds in Offset Printing
The concept of bleeds originated with traditional offset printing, where large sheets of paper are printed then cut down to the finished size. Due to mechanical tolerances, the alignment of printing plates, and the motion of paper through the press, some variation in cutting position is inevitable.
Bleeds allow for this variation by providing extra printed area that can be safely trimmed off without affecting the final appearance. As offset printing expert Brian Lawler explains:
"The bleed area is sacrificial. That is, it is there to be cut off. Its purpose is to make sure that when the inevitable variation of the guillotine cutting machine happens, there will be printed ink all the way to the edge of the sheet."
While modern offset presses are highly precise, bleeds are still considered a requirement for any professional print job.
Bleeds in the Digital Age
With the rise of digital printing (where toner or ink is applied directly to cut-size sheets), some have questioned whether bleeds are still necessary. The truth is, bleeds are just as important for digital print production.
Even the best digital printers have some variability in sheet position and cutting accuracy. According to a study by the Digital Print Deinking Alliance (DPDA), "the most demanding print applications, such as full-bleed prints, require a level of precision that is not consistently achievable with current digital printing technology."
So regardless of the printing method, it‘s best practice to set up files with proper bleeds to ensure the best possible results.
Industry Standards for Bleed Dimensions
So what exactly is the "proper" bleed amount to use? The most common bleed size is 0.125" (1/8 inch) per side for documents printed in the United States. Many print shops will specify 1/8" as their minimum bleed requirement.
However, some printers may ask for slightly larger bleeds, such as 0.1875" (3/16 inch), for certain types of projects or finishing processes. In a 2020 industry survey of over 300 commercial printers, WhatTheyThink found that 87% required a minimum 1/8" bleed, while 13% specified 3/16" or greater.
[Insert data chart showing bleed size survey results]
For countries that use the metric system, 3mm is the typical bleed size (slightly less than 1/8"). But as with imperial units, always check with your printer to confirm their specific requirements.
How to Set Up Bleeds in InDesign
Now that we‘ve covered the what and why of bleeds, let‘s get into the nitty gritty of how to actually set them up in InDesign. The process is pretty straightforward once you know where to look.
Creating a New Document with Bleeds
The ideal time to set up your bleeds is when first creating a new InDesign file. This way, you‘ll be able to visualize the bleed area on-screen as you design.
To add bleeds to a new document:
- Go to File > New > Document or press Cmd+N (Ctrl+N on PC).
- In the New Document Dialog box, locate the "Bleed and Slug" section at the bottom.
- Click the arrows to expand the bleed settings.
- Enter your desired bleed amount in the Top, Bottom, Inside, and Outside fields. Remember, standard bleed size is 0.125 in.
- If your layout has facing pages, uncheck the chain link icon to set a 0 bleed for the Inside (binding edge).
- Click Create.
[Insert screenshots of InDesign bleed setup dialog]
Your new document will open with red bleed guides visible outside the page borders. Any objects that extend to these guides will be "bleeding" off the edge.
Adding Bleeds to an Existing InDesign File
If you‘ve already started your design without bleeds, don‘t worry. It‘s easy to add them to an existing InDesign document:
- Open your InDesign file.
- Go to File > Document Setup or press Cmd+Alt+P (Ctrl+Alt+P on PC).
- In the Document Setup dialog, click the arrows next to Bleed and Slug to expand the settings.
- Enter the desired bleed amounts for each side.
- Click OK to apply the new bleed size.
The on-screen guides will automatically adjust to reflect the bleed dimensions. If you don‘t see the guides, go to View > Grids & Guides > Show Guides to toggle them on.
[Insert screenshot of InDesign Document Setup dialog]
Keep in mind that changing the bleed size for an existing layout will not automatically resize any page objects. You‘ll need to manually reposition graphics and adjust frames to properly extend into the new bleed area.
Understanding Bleed vs. Slug Area
In addition to the bleed, InDesign also has an option to specify a Slug area. While the bleed is meant to be trimmed off, the slug is an extra area outside the bleed that is used to hold printer‘s marks, color bars, or other production information.
[Insert diagram showing bleed vs slug area]
The slug does not print on the final piece but can be helpful for including job specs, date stamps, or other notes needed for proofing or printing. To set a slug area, simply enter the desired dimensions in the Slug section of the New Document or Document Setup dialog.
Not every project requires a slug. If you‘re unsure whether to include one, check with your print provider. They can advise on whether a slug is necessary and what information to include.
Checking Your Bleeds Before Printing
After you‘ve finalized your InDesign layout, it‘s crucial to preflight your file to ensure the bleeds are set up correctly. InDesign‘s built-in Preflight panel can help catch common bleed mistakes before you send the file to print.
To preflight your document:
- Go to Window > Output > Preflight to open the Preflight panel.
- In the Preflight panel, select "Bleed and Slug" from the Profile dropdown menu.
- Click the triangle next to "Bleed and Slug" to view individual preflight rules.
- Look for any errors or warnings related to insufficient bleeds.
[Insert screenshot of InDesign Preflight panel showing bleed checks]
Some common bleed errors to watch for:
- Objects not extending fully to the bleed guide
- Bleed is less than printer‘s minimum requirement
- Bleed dimensions are inconsistent across pages
- Crucial elements too close to trim edge
If you spot any issues, go back and adjust your layout accordingly. It‘s far easier to fix bleed problems in InDesign than after the file has been sent to print!
Advanced Bleed Techniques
For most projects, setting a consistent bleed on all four sides is sufficient. But in some cases, you may want to use different bleed amounts for each edge. This is known as an asymmetric or variable bleed.
To set an asymmetric bleed in InDesign:
- Open the New Document or Document Setup dialog.
- Expand the Bleed and Slug settings.
- Unlink the bleed fields by clicking the chain icon.
- Enter unique values for Top, Bottom, Inside, and Outside bleeds.
[Insert screenshot of asymmetric bleed setup]
Designers might use an asymmetric bleed for projects like pocket folders or packaging, where the artwork wraps around a die-cut template. The bleed size may need to be larger on certain edges to accommodate folding or gluing.
Another advanced technique is using InDesign‘s Liquid Layout feature to automatically adapt bleeds for different page sizes. This can be helpful if you need to output the same design in multiple formats, like letter and tabloid size.
To create a liquid layout with bleeds:
- Set up your original layout with bleeds.
- Go to Window > Interactive > Liquid Layout to open the panel.
- Click the Liquid Page Rule dropdown and choose "Scale."
- Go to Layout > Liquid Layout > Add Liquid Page Rule.
- Double-click the new master page to edit it.
- Resize the page to the alternate dimensions, ex. tabloid size.
InDesign will automatically adjust the bleed size proportionally as you change the page dimensions. No need to manually update the bleed settings for each variation.
[Insert screenshot of InDesign Liquid Layout panel]
Note that liquid layouts can get complicated quickly, so it‘s best to use this technique sparingly. For drastically different page sizes, it‘s often better to create separate files tailored to each format.
Working with Your Printer
Even with a thorough understanding of bleeds from a design perspective, it‘s important to communicate with your printer to ensure your files meet their production standards. Here are some tips for a smooth handoff:
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Ask for the printer‘s bleed specifications upfront, before you start designing. Don‘t assume 1/8" if they require a different size.
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Find out how the printer wants bleeds set up in the file. Some may have specific requirements for bleed slug area, crop marks, etc.
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Request a template file with the proper bleed and margin dimensions. Many printers provide these as InDesign, PDF, or Illustrator files.
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If you‘re unsure about any bleed settings, send the printer a draft PDF and ask them to check it before you finalize the design.
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Include detailed printing instructions when you send the final files, including bleed size, color space, quantity, etc. Never assume the printer knows your intent.
By opening a dialogue with your printing partner early on, you can avoid misunderstandings or production issues down the line. A little communication goes a long way!
Conclusion
We covered a lot of ground in this guide, from the basics of what bleeds are and why they matter to advanced techniques for maximizing your InDesign workflow. Here are the key takeaways:
- Bleeds are printed areas that extend beyond the final trim size to ensure color goes right to the edge
- The standard bleed size is 0.125" (1/8") on each side, but always check with your printer to confirm requirements
- Set up bleeds when creating a new InDesign document or add them to an existing file via Document Setup
- Extend objects and graphics fully to the bleed guides to avoid white slivers after cutting
- Use InDesign‘s Preflight panel to check bleeds before sending files to print
- Communicate with your printer early and often to ensure files are set up to their specifications
With these best practices in mind, you‘ll be ready to tackle any print project with confidence, from business cards to brochures to full-scale magazines. By mastering the art of the bleed, you can ensure your designs look polished and professional, every time.