Another issue we sometimes encounter with people making their first book is that the images didn't print as sharply as they expected.
While our book-making tools will warn you if an image's resolution isn't high enough to print well, it's impossible for our tools to identify and warn you about issues like grainy or blurry images, poor focus, jaggies or compression artifacts in your images.
That's where your own eyes come in.
Use the 200% test
Images sometimes look fine from a distance or when viewed on your camera, but a close-up look will reveal any flaws. If you have any doubts about your image, use a photo-viewing program to zoom in to your image to 200% and see how the image looks.
This is a useful test for *any* image. You should definitely do the 200% test on any image you converted from another source, like a PDF or Word document, or any image that was scanned.
How to zoom to 200%
- Using a Mac: zoom in with Preview and follow these instructions.
- Using Windows: try these instructions for zooming in on an image.
- If your image looks sharp and not grainy at 200% then it will most likely look ok in print.
- See sample images below.
- Disclaimer: although the 200% test is useful, your printed Blurb book is the ultimate test. And the 200% test won't tell you if your image is too dark to print well.
- If you plan to order multiple copies, first order and review a single, Blurb-printed copy.
What if images look bad at 200%?
If your original images look grainy, blurry, pixelated, jagged or just plain bad at 200%, they will look that way (or worse) in print.
- If so, there is, unfortunately, no ideal way to fix poor quality originals.
- Attempting to fix the images (in Photoshop or similar programs) can only do so much, and may make things worse if overdone.
How to avoid grain, blur and pixelation
Avoid a high ISO setting on your camera
When taking photographs make sure your camera's ISO setting isn't too high. (Higher ISO = greater chance of grainy images). By keeping your ISO setting as low as lighting allows, you minimize the risk of grainy images.
There's no magic number and every camera handles ISO a bit differently but the higher the ISO, the more likely you'll encounter digital noise and grain in your images.
Avoid using low resolution images
While low resolution images might look fine on your monitor, depending on how big you try to stretch them for your printed book, they may not fare well. But don't worry—our book-making tools will alert you when the image you're trying to use has a resolution that won't print well. If the low-res warning appears, reduce the size of the image on the page until the warning goes away.
Use a tripod with a remote shutter release
One common cause of blurry images is camera shake. You can avoid that issue by stabilizing your camera with a tripod and using the timer setting on your camera or a remote control shutter release (pressing the button can lead to camera shake).
Focus, focus, focus
When taking photos, be sure to focus on your subject. Any out of focus images will not print well.
Here's a screenshot of an image viewed at 100%. It doesn't look so bad at first glance...
...but here's the same image zoomed to 200%. Notice how it's actually blurry ("soft") and nothing is really in focus. It will look just as blurry in print.
Here's another (and sharper image) at 100%.
Here's the same image zoomed in on the hat. Notice it's still relatively sharp, with sharp lines and no strong grain--unlike the other example.
Finally, one last example:
And the same image at 200%...notice how it's still sharp?