PGM vs PNG
Una comparativa detallada de PGM Grayscale Image y PNG Image — tamaño de archivo, calidad, compatibilidad y cuál elegir según tu flujo de trabajo.
PGM Grayscale Image
Raster & Vector ImagesPGM (Portable Graymap) stores grayscale images in a simple ASCII or binary format.
Sobre los archivos PGMPNG Image
Raster & Vector ImagesPNG is a lossless image format that supports transparency. It is ideal for graphics, logos, screenshots, and any image where preserving exact pixel data is important.
Sobre los archivos PNGComparativa de ventajas
PGM Ventajas
- Trivially simple to parse and generate.
- Ideal Unix pipeline intermediate for grayscale processing.
- Preserves 16-bit depth for scientific and medical data.
- Universal tooling (Netpbm, ImageMagick, Tesseract).
- ASCII variant is human-readable.
PNG Ventajas
- Lossless compression — every save preserves the original pixels perfectly.
- Full 8-bit alpha channel for smooth transparency.
- Excellent for text, UI screenshots, logos, and line art.
- Royalty-free and an ISO standard (ISO/IEC 15948).
- Supports 16-bit color depth for high-fidelity work.
Limitaciones
PGM Limitaciones
- No compression — files balloon for large images.
- No metadata, no color profile.
- Grayscale only — drop to PBM for bitmap or up to PPM for color.
- Not a delivery format — strictly pipeline intermediate.
PNG Limitaciones
- Much larger than JPEG for photographs (no perceptual compression).
- No native animation in most software (APNG support is inconsistent).
- No CMYK support — web and screen only, not print.
- Metadata capabilities are less rich than JPEG's EXIF.
Especificaciones técnicas
| Especificación | PGM | PNG |
|---|---|---|
| MIME type | image/x-portable-graymap | image/png |
| Extension | .pgm | — |
| Variants | P2 (ASCII), P5 (binary) | — |
| Bit depth | 8-bit or 16-bit per pixel | — |
| Creator | Jef Poskanzer (1988), Netpbm toolkit | — |
| Compression | — | Lossless — DEFLATE (zlib) |
| Color depth | — | 1, 2, 4, 8 or 16 bits per channel |
| Max dimensions | — | 2^31 − 1 pixels per side (2.1 billion) |
| Transparency | — | Full 8-bit alpha channel |
| Standard | — | ISO/IEC 15948:2004 |
Tamaños típicos de archivo
PGM
- 1920×1080 grayscale 8-bit (binary P5) ~2 MB
- 1920×1080 grayscale 16-bit ~4 MB
- DICOM-equivalent medical slice 500 KB - 20 MB
PNG
- Icon or small logo 2–20 KB
- UI screenshot (1920×1080) 200–800 KB
- High-res photo (12 MP) 10–30 MB
- Print-ready illustration 5–50 MB
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Preguntas frecuentes
PGM (PGM Grayscale 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 PGM when its particular strengths match the publishing target.
PGM (PGM Grayscale 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 PGM when its particular strengths match the publishing target.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) open PGM natively. On mobile, iOS Photos and Google Photos display PGM 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 PGM to JPG or PGM to PNG converter.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) abrir PGM natively. On mobile, iOS Photos e Google Photos display PGM 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 PGM to JPG ou PGM to PNG converter.
Upload the PGM 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; PGM 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.