Good news: canvas forgives on resolution
Unlike a glossy photo print, canvas is gracious about resolution. The fabric has a coarse, matte texture that swallows the finest detail anyway, and large canvases are viewed from several meters. So 100 to 150 dpi at the target size is often enough — well below the 300 dpi of a photo print. Rough math for 150 dpi:
- 40 × 30 cm → about 2360 × 1770 px
- 60 × 40 cm → about 3540 × 2360 px
- 100 × 70 cm → about 5900 × 4130 px (viewed from further away, often possible with fewer dpi too)
A current phone photo (4000 × 3000 px and up) is thus enough for the usual living-room formats. How to work out the required pixel count in general is in Is my iPhone photo good enough to print?
The real trap: the gallery wrap
The bigger problem isn't sharpness, it's the gallery wrap (also mirror or wrap edge). On a stretcher-frame canvas the image is pulled around the edges so the sides are printed too. That means: a strip of several centimeters around your subject disappears from the front view around the corner. If a head, text, or the horizon sits too close to the edge, it moves onto the side edge — or gets clipped. That's the reason for the infamous "half heads" on self-ordered canvases.
How to plan for the wrap
- Know the wrap allowance. Providers usually plan 3–5 cm all around for the wrap — the exact value is in the spec sheet.
- Keep the subject in the safe center. When cropping to the target format, keep important image parts (faces, text, horizon) a clear distance from the edge — the same safety-zone logic as with bleed and trim in print.
- Take the preview seriously. Many providers show a 3D preview with the wrap edge marked. If a head sits over the edge there, it does on the finished canvas too.
Alternative for a tight subject: a mirror or color edge, where the wrap area consists not of the photo but of a mirrored copy or a solid color — then the whole subject stays on the front.
Format and subject have to match
Forcing a portrait shot onto a landscape canvas ends in cropping compromises. The aspect ratio of the photo should co-determine the canvas format — or plan the crop deliberately. Panoramas look great on wide canvases, square subjects on square formats.
No shrinking, no compressing
As with any print product: the order system needs the originals at full resolution, not web-shrunk or WhatsApp-saved versions. Compression is out of place here — the provider software scales appropriately itself. The only sensible intervention up front: straighten, crop, and if needed a touch of contrast, since canvas slightly dampens saturation.
Frequently asked questions
What resolution does a photo need for canvas printing?
Less than for a glossy photo print: canvas has a coarse texture and is viewed from a distance, so 100 to 150 dpi at the target size is often enough. For a 60 × 40 cm canvas at 150 dpi that's about 3540 × 2360 pixels — a current phone photo usually manages that.
What is the gallery wrap and why does it matter?
On a stretcher-frame canvas the image is pulled around the edges so the sides are printed too. This wrap-around area (gallery or mirror edge) disappears from the front view — anything too close to the edge (heads, text) can wander around the corner or get cut off.
How do I avoid cut-off heads on the canvas?
By leaving enough safety margin all around when cropping — usually the 3 to 5 cm the provider plans as a wrap. Important image parts belong in the central area, not at the edge. Many providers show a preview with the edge marked; take it seriously.
Do I have to edit the photo for canvas?
Usually cropping to the target format and a look at the resolution is enough. Since canvas slightly dampens contrast and saturation, a touch more of both can help. Use the originals for the print, not web-shrunk versions.