High effective PPI
Fine detail
Smaller, denser pixels normally produce smoother edges and clearer photographic detail.
Print Resolution Guide: PPI, DPI & Effective Image Quality
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Image Magic Print-Ready Artwork Guide
Check Resolution at the Final Printed Size
An image may look sharp on a phone or computer but become blurred, jagged or pixelated after enlargement. The important measurement is the image’s effective PPI at the size it will actually be printed.
Quick Resolution Recommendations
Close-view printingAim for approximately 250–300 effective PPI.
Posters and displaysApproximately 150–250 effective PPI may be suitable.
Large-format bannersApproximately 100–150 effective PPI may work at viewing distance.
Logos and line artworkSupply vector PDF, AI, EPS or SVG whenever possible.
These are general recommendations at the final printed size. Product templates, material, printing method and Image Magic production advice take priority.
What Is Image Resolution?
A raster or bitmap image is made from a fixed grid of pixels. Resolution describes how densely those pixels are used when the image is printed. More pixels at the same printed size generally allow finer detail.
Medium effective PPI
Suitable at distance
May be acceptable for posters and displays that are not examined closely.
Low effective PPI
Visible pixels
Enlarged pixels can create jagged edges, blocky photographs and blurred details.
A large file size does not guarantee high resolution. A large PDF can still contain low-resolution images, while a compressed image may have sufficient pixel dimensions for a small printed size.
PPI and DPI Are Different
| Term | Meaning | What it measures | Who normally checks it |
|---|---|---|---|
| PPI | Pixels per inch | Pixel density of a raster image at its printed size | Designer, artwork supplier and prepress team |
| Effective PPI | PPI after scaling in the layout | The resolution that will actually be available at output size | Designer and prepress team |
| DPI | Dots per inch | The printer or output device’s physical ink or toner dots | Printer manufacturer and production team |
A 300 PPI photograph is not the same as a printer operating at 300, 600, 1200 or 2400 DPI. A printing device may use many output dots to reproduce one image pixel, colour tone or halftone area.
Raster Artwork vs Vector Artwork
Raster or bitmap artwork
JPEG, PNG, TIFF and photographs contain a fixed number of pixels. Enlarging them reduces effective PPI and can reveal pixelation.
Vector artwork
Vector logos, text, shapes and line artwork are based on paths and can normally be enlarged without losing edge sharpness.
A PDF may contain both
Text and logos can remain vector while photographs inside the same PDF are raster images with their own effective PPI.
A JPEG is always raster
Saving a vector logo as JPEG converts it into pixels. It may then lose quality when enlarged.
A file extension alone does not prove that artwork is vector. A PDF, AI or EPS file may still contain an embedded low-resolution JPEG.
Actual PPI and Effective PPI
Actual PPI describes the source image. Effective PPI describes the resolution after the image has been enlarged or reduced inside the final artwork.
Effective PPI formula
Effective PPI = original PPI ÷ enlargement factor
| Original image | Placed scale | Effective result |
|---|---|---|
| 300 PPI | 100% | 300 effective PPI |
| 300 PPI | 150% | 200 effective PPI |
| 300 PPI | 200% | 150 effective PPI |
| 300 PPI | 50% | 600 effective PPI |
Changing an image label from 72 PPI to 300 PPI without adding real pixels does not improve its detail. Enlarging with resampling creates estimated pixels but cannot fully restore information that was never present in the original image.
Recommended Resolution at Final Size
| Printed application | General effective PPI target | Typical viewing condition |
|---|---|---|
| Business cards, postcards and invitations | 250–300 PPI | Held and examined closely |
| Flyers, brochures, booklets and documents | 250–300 PPI | Normal reading distance |
| A3–A1 posters and indoor displays | 150–250 PPI | Viewed from approximately one metre or more |
| Roll-up bunting and event backdrops | 100–150 PPI | Viewed from several metres away |
| Very large signs and distant outdoor graphics | Confirm with Image Magic | Required resolution depends strongly on viewing distance |
Logos, QR codes, small text and fine line artwork should remain vector whenever possible, even when the photographic background uses a lower large-format resolution.
Required Pixel Dimensions at 300 PPI
The table below shows approximate pixel dimensions for common finished sizes before bleed is added.
| Finished size | Approximate pixels at 300 PPI |
|---|---|
| Business Card — 90 × 54 mm | 1063 × 638 pixels |
| A6 — 105 × 148 mm | 1240 × 1748 pixels |
| A5 — 148 × 210 mm | 1748 × 2480 pixels |
| A4 — 210 × 297 mm | 2480 × 3508 pixels |
| A3 — 297 × 420 mm | 3508 × 4961 pixels |
Pixel calculation
Required pixels = size in millimetres ÷ 25.4 × required PPI
For example, an A4 file with 3 mm bleed on each edge has an artwork size of 216 × 303 mm. At 300 PPI, this is approximately 2551 × 3579 pixels.
How to Check Image Resolution Correctly
Confirm the final printed size
Resolution cannot be judged correctly until the intended width and
height are known.
Check pixel dimensions
Review the image width and height in pixels, not only its file size.
Check Photoshop at final size
Open Image Size, turn Resample off and enter the intended print
dimensions to view the available PPI.
Check InDesign Effective PPI
Select the placed image and inspect its Effective PPI in the Links panel.
Run PDF preflight
Acrobat Pro Preflight can identify low-resolution images, missing
fonts, transparency and other production issues.
Inspect the final exported PDF
Check photographs, logos, small text, QR codes and fine lines after
export, not only in the original design application.
Print a section at actual size
For critical projects, print a small cropped section at 100% physical
size to evaluate sharpness.
Ask Image Magic when uncertain
Send the final size, viewing distance and artwork file for production advice.
Why Zooming to 300%–400% Is Not an Accurate Test
Enlarging a PDF on screen may help reveal compression blocks, jagged edges or obvious pixelation. However, the zoom percentage is affected by monitor resolution, screen scaling and PDF viewer behaviour.
Use zooming only as a visual warning. Effective PPI at the final printed size is the more reliable technical measurement.
Common Sources of Low-Resolution Images
- Images copied from websites or search-engine previews.
- Screenshots of logos, documents or social-media posts.
- Images downloaded from WhatsApp or messaging applications after compression.
- Small photographs enlarged far beyond their original dimensions.
- JPEG files repeatedly opened, edited and saved with heavy compression.
- PDF export settings that downsample images too aggressively.
- Placed images that were scaled up significantly in the layout.
- Logos supplied as photographs instead of vector artwork.
Can Low-Resolution Artwork Be Fixed?
Replace the source image
The best solution is normally to obtain the original photograph, camera file, design file or higher-resolution stock image.
Rebuild logos as vector
Simple logos, icons and line drawings may be redrawn as vector artwork for clean scaling.
Reduce the printed size
Using the same pixels at a smaller physical size increases effective PPI.
Use careful enhancement
Resampling or AI enhancement may improve appearance, but it cannot guarantee the recovery of genuine original detail.
Sharpening, changing the PPI field or saving the file as PDF does not automatically turn a low-resolution image into true high-resolution artwork.
Exporting Print-Ready Artwork
- Export as a print-quality PDF rather than flattening the entire design into JPEG.
- Keep text, logos, shapes and line artwork as vector where possible.
- Avoid aggressive image downsampling or low-quality JPEG compression.
- Use CMYK or the colour setup specified for the selected product.
- Embed fonts or convert them to outlines when required.
- Include the correct bleed and finished page size.
- Inspect the exported PDF before uploading.
Microsoft Word, PowerPoint and online design applications can be used for simple layouts, but they may provide less control over effective PPI, bleed, colour, fonts and PDF compression than professional prepress applications. Always inspect the exported PDF.
Common Resolution Mistakes
Treating 300 PPI as universal
Large-format output may use a lower effective resolution depending
on viewing distance.
Confusing PPI with printer DPI
They measure different parts of the imaging and printing process.
Checking only the original PPI
Enlargement in the layout can reduce the effective PPI significantly.
Changing 72 PPI to 300 PPI
Changing metadata without real pixels does not add image detail.
Judging by file size
File size does not reliably show the resolution at final print size.
Relying only on screen zoom
Monitor zoom is not a substitute for effective-PPI measurement.
Rasterising logos and text
Converting vector content to a small JPEG can reduce edge sharpness.
Checking the design but not the PDF
Export compression can reduce image quality after the layout is completed.
Final Resolution Checklist
✓Final printed size and viewing distance are confirmed.
✓Raster images have suitable effective PPI at final size.
✓Logos, text and line artwork remain vector where possible.
✓Placed images have not been enlarged excessively.
✓No screenshots or preview thumbnails are used as final artwork.
✓PDF export does not apply excessive downsampling.
✓Bleed and final page dimensions are correct.
✓The final exported PDF has been inspected or preflighted.
Frequently Asked Questions
Is 300 PPI required for every print product?
No. It is a strong target for detailed, close-view printing. Large-format graphics viewed from farther away may use lower effective PPI. Confirm unusual applications with Image Magic.
Is 300 PPI the same as 300 DPI?
No. PPI describes image pixels at the printed size, while DPI describes the output dots produced by the printing device.
Why is my 300 PPI image showing as 150 effective PPI?
It has probably been enlarged to approximately 200% in the layout. Doubling its printed dimensions halves the effective PPI.
Can I make a 72 PPI image 300 PPI?
You can resample it, but the new pixels are estimated. This may improve appearance but does not recreate all missing original detail.
Are PDF files always high resolution?
No. A PDF can contain vector text together with low-resolution photographs or compressed images.
Why does the image look sharp on my phone but blurred in print?
A phone displays the image at a small physical size. Printing it much larger spreads the same pixels across a larger area.
Can Image Magic print low-resolution artwork?
It may be possible to print it as supplied, but pixelation or blur may remain. Replacement, resizing or artwork rebuilding may be recommended.
Need Help Checking Your Image Resolution?
Send us the artwork file, final printed size, product type and expected viewing distance. Our team can advise whether the effective resolution is suitable before production.