Choosing the right resolution for print

An image that looks razor-sharp on your screen can still print soft and blurry. Print packs far more detail into an inch than any display does, so a picture needs many more pixels to hold up on paper than it does on a monitor.

Sharp on screen, soft in print#

Resolution is measured in PPI — pixels per inch. Your screen shows roughly 72–150 pixels per inch, so a small image can look perfectly crisp there. A commercial press resolves around 300 pixels per inch at normal, hand-held viewing distance. Hand the press that same small image and it has to stretch those few pixels across a much finer grid — the result is soft edges, fuzzy detail, and visible blockiness, especially on text baked into a photo or logo.

The fix isn't magic. It's giving the press enough pixels at the size you're printing.

Why 300 PPI#

300 PPI at the final printed size is the target for anything you hold in your hand — business cards, labels, flyers, packaging, stickers. Below that, fine edges start to break down; well below it, the whole image looks fuzzy. At 300 the dots are small enough that your eye reads a smooth, continuous picture.

You'll also see the term DPI (dots per inch). People use PPI and DPI interchangeably in everyday talk. Strictly, PPI describes the pixels in your image and DPI describes the ink dots the press lays down — but for choosing images, treat "300 DPI" and "300 PPI" as the same rule of thumb.

Effective PPI: size changes everything#

Here's the idea that trips people up. Resolution isn't just how many pixels an image has — it's pixels divided by the printed inches they're spread across.

The same 1200-pixel-wide photo is:

So scaling an image up on the canvas lowers its effective resolution — you're spreading the same pixels thinner. Shrinking an image raises its effective PPI, because those pixels now pack into a smaller space. This holds true even when the image lives inside a group you scaled up; enlarging the group enlarges the image and thins its pixels right along with it.

The takeaway: a 300 PPI image is only 300 PPI at one specific printed size. Blow it up and you've quietly dropped below the line.

How Popcorn Editor flags it#

You don't have to do this arithmetic in your head. In a CMYK (print) document, Popcorn Editor computes each image's effective PPI — accounting for how much you've scaled it — and flags anything short of the target right on the image in the Properties panel:

• Below recommended print resolution — an amber warning when an image is under 300 PPI.
• Resolution too low for print — a red warning when it's well under (below 150 PPI), where the softness will be obvious.

Either way, the detail line spells out the numbers: {ppi} PPI — {target} PPI recommended, so you can see exactly how far off you are and whether shrinking the image a little would clear it.

These warnings appear only in a CMYK (print) document, because resolution is a print concern. Working in RGB for a screen design? The check stays quiet — you don't need 300 PPI for something that will only ever be viewed on a screen.

The export check, too#

The same signal shows up one more time as a safety net. When you open the Export dialog (Share → Download) and set up a print PDF, the Print checks panel aggregates every low-res image into a single warning:

{count} image(s) below 300 PPI (lowest {min} PPI) — may print soft or pixelated.

Print checks are informational — they never block your export — but this is your last chance to catch a soft image before it reaches the press. Clear the reds before you download.

How to fix a low-res image#

When something gets flagged, you have several good options:

• Use a larger source file. Re-export or re-download the original at higher resolution and replace the placeholder.
• Scale the image down. If the design allows, making it smaller on the canvas raises its effective PPI and may clear the warning outright.
• Replace it. Swap in a sharper version using the image Replace control.
• Go vector where you can. Logos, icons and simple graphics are sharper — and infinitely scalable — as vector shapes than as pixels.
• Regenerate with the Assistant. For AI-made imagery, generate a fresh, larger version rather than stretching a small one.

What doesn't work is upscaling a small JPEG in another app and hoping for the best — that invents pixels without adding real detail, so it still prints soft.

The large-format exception#

The 300 rule is for pieces you hold close. Things viewed from meters away — banners, posters seen across a room, billboards — read perfectly fine at 100–150 PPI, because your eye can't resolve the detail at that distance anyway. If you're designing a trade-show banner and see an amber flag, judge it by how far the viewer will stand, not by the number alone.

Next: put this into practice with a full pre-flight checklist before you send to the printer, or see how it plays out on small artwork in make stickers that print sharp. For the underlying feature, the docs cover image resolution & the print check.