SGI vs TIFF
SGI Image と TIFF 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。
SGI Image
Raster & Vector ImagesSGI (Silicon Graphics Image) is a raster image format developed by Silicon Graphics for use on their IRIX workstations. It supports both uncompressed and RLE-compressed storage with up to 4 channels including alpha.
SGI ファイルについてTIFF Image
Raster & Vector ImagesTIFF is a flexible, high-quality image format widely used in publishing, printing, and professional photography. It supports multiple compression methods and color spaces including CMYK.
TIFF ファイルについて長所の比較
SGI 長所
- Historic VFX pipeline format.
- 16-bit channel support.
- RLE compression.
- ImageMagick compatibility.
TIFF 長所
- Lossless by default — no generation loss on successive edits and saves.
- Supports any bit depth (1 to 32 bits per channel), any color model, any number of channels.
- Extensible tag system means vendor-specific data survives alongside standard tags.
- Multi-page containers are perfect for scanned documents, faxes, and DICOM-like stacks.
- Industry-standard for archival, museums, scientific imaging, and high-end print prepress.
制限・弱点
SGI 制限・弱点
- Legacy — SGI Inc. is gone.
- Superseded by OpenEXR/DPX in film.
- Niche tooling.
TIFF 制限・弱点
- File sizes are huge compared to JPEG/WebP/AVIF — often 10-30× larger.
- Not a web format — no browser displays TIFF natively.
- Ambiguous spec areas mean some TIFFs only open correctly in the tool that created them.
- Weak animation support — designed for still imagery.
技術仕様
| 仕様項目 | SGI | TIFF |
|---|---|---|
| MIME type | image/x-sgi | image/tiff |
| Extensions | .sgi, .rgb, .rgba | .tif, .tiff |
| Compression | None or RLE | — |
| Bit depth | 8 or 16 bits per channel | — |
| Standard | — | TIFF 6.0 (1992); BigTIFF extension for 64-bit offsets |
| Max file size | — | 4 GB (TIFF); 2^64 bytes (BigTIFF) |
| Compression options | — | None, LZW, Deflate, JPEG, CCITT G3/G4, PackBits, JBIG |
一般的なファイルサイズ
SGI
- 1080p 8-bit SGI frame 4-8 MB
- 4K 16-bit SGI 50-100 MB
TIFF
- Scanned A4 page (300 dpi, B&W) 100-300 KB
- Scanned A4 page (600 dpi, color) 15-40 MB
- Print-quality magazine photo 30-150 MB
- Satellite GeoTIFF tile 50 MB - 5 GB
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よくある 質問
SGI (SGI 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 SGI when its particular strengths match the publishing target.
SGI (SGI 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 SGI when its particular strengths match the publishing target.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) open SGI natively. On mobile, iOS Photos and Google Photos display SGI 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 SGI to JPG or SGI to PNG converter.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) abrir SGI natively. On mobile, iOS Photos e Google Photos display SGI 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 SGI to JPG ou SGI to PNG converter.
Upload the SGI 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; SGI 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.