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WMF at a glance
WMF
The original WMF specification was published in the Windows 3.1 SDK documentation in 1992. Aldus Corporation independently added a 'placeable' header for device independence, which Microsoft later incorporated in Windows 2000. The format specification was republished in 2006 under the Microsoft Open Specification Promise.
PSB at a glance
PSB
Photoshop's native format became one of the de facto interchange anchors of raster design and retouching, even outside Adobe-only teams, because so many creative pipelines converged around its feature set.
Format comparison
| Feature | WMF | PSB |
|---|---|---|
| File type | Vector | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1990 | 1990 |
| Inventor | Microsoft Corporation | Adobe |
| Status | legacy | proprietary |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Layer support | Not supported | Supported |
| Vector scaling | Supported | Not supported |
When to use each format
When to use WMF
- Your source file is already in WMF.
- Preserve source expectations before exporting to PSB.
- WMF is commonly used in vector workflows.
When to use PSB
- Your target workflow expects PSB.
- Improve delivery compatibility with PSB.
- PSB is commonly used in image workflows.
FAQs
Why convert WMF to PSB?
Convert to PSB when the image must remain editable in Photoshop at very large dimensions or layer counts.
It is useful for oversized composites, print backdrops, and complex production artwork.
What changes when converting WMF to PSB?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to PSB adds layer support. Moving to PSB removes vector scaling.
What should I review after converting WMF to PSB?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.