EXR vs JPG
OpenEXR Image と JPEG Image を徹底比較 — ファイルサイズ、品質、互換性、そして用途に応じた最適なフォーマットの選び方を解説します。
OpenEXR Image
Raster & Vector ImagesOpenEXR is a high dynamic range imaging format used in visual effects and film production.
EXR ファイルについてJPEG Image
Raster & Vector ImagesJPEG is the most widely used lossy image format on the web. It achieves small file sizes through adjustable compression, making it ideal for photographs and complex images where some quality loss is acceptable.
JPG ファイルについて長所の比較
EXR 長所
- Genuine high-dynamic-range storage (32-bit float per channel).
- Multi-channel layers native — store an entire render pass in one file.
- Industry standard across every major VFX and animation studio.
- Deep samples enable modern compositing workflows.
- Open-source reference implementation with mature tooling.
JPG 長所
- Excellent compression ratio for photographs (10:1 or better without visible quality loss).
- Universal support — every camera, phone, OS, and browser reads JPEG natively.
- Adjustable quality setting balances file size against visual fidelity.
- Embeds EXIF metadata (camera model, GPS, exposure) automatically.
- Progressive rendering for graceful loading over slow networks.
制限・弱点
EXR 制限・弱点
- Enormous file sizes.
- Not a web format — browsers don't display EXR.
- Decoding is CPU-intensive.
- Consumer apps rarely need HDR at this precision.
JPG 制限・弱点
- Lossy — every save degrades the image further (generation loss).
- No transparency channel (use PNG or WebP for that).
- Visible compression artifacts on text, sharp edges, and flat colors.
- Limited to 8 bits per channel — poor for HDR or print work.
- Baseline JPEG tops out at 65,535 × 65,535 pixels.
技術仕様
| 仕様項目 | EXR | JPG |
|---|---|---|
| MIME type | image/x-exr | image/jpeg |
| Extension | .exr | — |
| Bit depths | 16-bit half-float, 32-bit float, 32-bit uint | — |
| Compression | ZIP, PIZ, PXR24, B44, DWAA, DWAB, RLE, None | Lossy — Discrete Cosine Transform + quantization + Huffman coding |
| Max channels | Practically unlimited (arbitrary named layers) | — |
| Color depth | — | 8 bits per channel (24-bit RGB or 8-bit grayscale) |
| Max dimensions | — | 65,535 × 65,535 pixels (baseline) |
| Transparency | — | Not supported |
| Typical quality | — | 75–90 for web, 95+ for print |
一般的なファイルサイズ
EXR
- 1080p half-float with alpha 15-25 MB
- 4K multichannel VFX render 200-500 MB
- 8K deep EXR (heavy comp) 1-4 GB per frame
JPG
- Phone photo (12 MP, quality 85) 2–5 MB
- Web thumbnail (400px) 20–60 KB
- Full-page magazine photo 500 KB – 2 MB
- Social-media square (1080×1080) 100–400 KB
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よくある 質問
EXR (OpenEXR Image) is an image format used to store raster graphics — a two-dimensional grid of pixels describing a picture. It is part of the raster & vector images family and designed around a specific trade-off between file size, visual fidelity, and feature support (transparency, colour depth, compression type). Photographers, web designers, and content creators choose EXR when its particular strengths match the publishing target.
EXR (OpenEXR Image) is an image formato used to store raster graphics — a two-dimensional grid of pixels describing a picture. It is part of the raster & vector images family e designed around a specific trade-off between tamanho do arquivo, visual fidelity, e feature support (transparency, colour depth, compressão type). Photographers, web designers, e content creators choose EXR when its particular strengths match the publishing target.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) open EXR natively. On mobile, iOS Photos and Google Photos display EXR in the gallery when supported by the OS. If the format is rare or new, convert to JPG or PNG first — both are universally readable — using our EXR to JPG or EXR to PNG converter.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) abrir EXR natively. On mobile, iOS Photos e Google Photos display EXR no gallery when suportado por the OS. If the formato is rare ou new, converter to JPG ou PNG first — both are universally readable — usando our EXR to JPG ou EXR to PNG converter.
Upload the EXR to KaijuConverter and pick a target format (JPG, PNG, WebP, HEIC, TIFF, BMP, SVG, PDF). The conversion runs in the browser via ImageMagick and returns a download in seconds. No account or installation required; both input and output delete automatically within two hours.
It depends on the task. JPG is the smallest file size for photographs; PNG is lossless with transparency; EXR has its own niche that may favour colour depth, animation, or encoding efficiency over one or both of those. For the final web publish, test all three and measure file size plus visible quality on real content.