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PGM in het kort
PGM
PBM, PGM, PPM, PNM, and later PAM come from the tool-centric tradition of keeping image interchange formats easy to parse, script, and transform.
VML in het kort
VML
VML emerged as a 1998 W3C submission backed by Microsoft and partners such as Autodesk, Hewlett-Packard, Macromedia, and Visio, reflecting the moment when web graphics standards were still unsettled.
Formaatvergelijking
| Kenmerk | PGM | VML |
|---|---|---|
| File type | Image | Vector |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1988 | 1998 |
| Inventor | Jef Poskanzer / Netpbm lineage | Microsoft, Macromedia, Autodesk, Hewlett-Packard, Visio |
| Status | active | legacy |
| Transparency | Niet ondersteund | Niet ondersteund |
| Animation | Niet ondersteund | Niet ondersteund |
| Primary use cases |
|
|
| Layer support | Niet ondersteund | Niet ondersteund |
| Vector scaling | Niet ondersteund | Ondersteund |
Wanneer je elk formaat gebruikt
When to use PGM
- Your source file is already in PGM.
- Preserve source expectations before exporting to VML.
- PGM is commonly used in image workflows.
When to use VML
- Your target workflow expects VML.
- Improve delivery compatibility with VML.
- VML is commonly used in vector workflows.
Veelgestelde vragen
Why convert PGM to VML?
Convert to or from VML when migrating legacy Office drawings, cleaning up IE-era web content, or translating Microsoft-specific vector markup into SVG, PNG, or modern document formats.
It is mainly a bridge format for archival recovery and standards migration.
What changes when converting PGM to VML?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to VML adds vector scaling.
What should I review after converting PGM to VML?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.