Posters, banners, and canvas prints — pixel prep

A 4 × 6 inch print at 300 DPI needs 1200 × 1800 pixels. An 8 × 10 at 300 DPI needs 2400 × 3000. An 11 × 14 at 300 DPI needs 3300 × 4200. A 16 × 20 at 300 DPI needs 4800 × 6000. A 24 × 36 inch poster at 150 DPI (viewed from a few feet) needs 3600 × 5400. The same poster at 300 DPI wants 7200 × 10800 — the 10,800 side exceeds this tool’s 10,000 px cap, so you cannot honestly deliver 300 DPI on that size here. Large-format shops often accept 100–150 DPI because viewers stand back. Growing a 1200 px photo to “meet” 24 × 36 at 150 DPI still looks soft up close; it may look acceptable across a room. Start from the largest master. Crop for canvas wraps before scaling so faces are not in the wrap zone. Convert HEIC first. Optional light sharpen helps mid-tones; heavy sharpen halos in pigment prints. This is classical Canvas, not a print-shop neural upscaler. After export, compress only if the lab’s upload form has a megabyte cap — never below the pixel count you just earned.