Photo printing
Plan a gallery wall without forcing every photo into one crop
Build a consistent set of prints by separating frame openings, image ratios, density and borders in a simple sizing worksheet.
Consistency can come from frame size, visible image size or border treatment. Choose which one matters before cropping the entire set.
Decide what needs to match
A set of identical frames does not require identical image ratios. You can use the same outside frame with different mats, keep the same visible image height, or make every image fill an equal opening. Each approach produces different crop and border requirements.
Record the visible opening as well as the nominal frame size. A mat or frame lip may cover part of the print. Use the provider’s actual measurements instead of assuming the sheet edges remain completely visible.
Inventory the actual source images
Create a row for each photo with its width, height, orientation and the content near its edges. A 4000 × 3000 landscape image, a 3000 × 4000 portrait and a 3000 × 3000 square do not respond the same way to an 8 × 10 portrait opening.
Keep numerical sufficiency separate from composition. A photograph with generous background can tolerate a large crop; another with a face close to the edge may need a border even when it has more pixels.
| Image | Source pixels | Opening | Decision to inspect |
|---|---|---|---|
| Landscape example | 4000 × 3000 | 8 × 10 in | Portrait crop or wide borders |
| Portrait example | 3000 × 4000 | 8 × 10 in | Small top/bottom crop |
| Square example | 3000 × 3000 | 8 × 10 in | Side crop or top/bottom borders |
Calculate each finished placement
The 3000 × 4000 portrait filling 8 × 10 inches has an effective density of 375 PPI. A centered exact 4:5 crop is 3000 × 3750, retaining 93.75% of the source area. The landscape image filling the same opening loses much more of its composition.
Fitting each image instead preserves all its content but creates different borders. You can use those borders intentionally, or choose a mat that makes the difference feel consistent. The calculation helps reveal the tradeoff; it cannot choose which composition looks best.
Check a set at its intended viewing size
Review proofs together under the conditions where the set will be seen. Similar pixel density does not guarantee matching sharpness, color or contrast. Keep edits and export choices deliberate, particularly when photos come from different cameras or were taken under different lighting.
If you choose different physical image sizes inside equal frames, recalculate each PPI value separately. A shared target density is a useful specification, but not a reason to resample every image to the same pixel dimensions when its printed size differs.
Prepare a clear order record
Name the final exports in a way that distinguishes orientation and size, and keep a worksheet listing which file belongs to which opening. Record fit/fill, crop position and any borders requested from the provider. Do not include private filenames in a public shared calculator link.
Check one order preview at a time against the worksheet. A copied setting from the previous photo may be inappropriate for the next. Save the numerical calculations as CSV and keep them with the final files so that a replacement print can be reproduced later.
Sources & further reading
These references support the definitions. The calculations and examples in this article are original; printer-specific requirements must be checked with your provider.
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DPI Calculator
Calculate the DPI (PPI) of an image at your print size: DPI = pixels ÷ inches. Choose a local image or enter its pixels, then compare fit versus crop.
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