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Image MIME Reference
PaintShop-Pro-PSP

PaintShop Pro Image

image/x-paintshoppro
VS

SealedMedia SoftSeal GIF

image/vnd.sealedmedia.softseal.gif
SoftSeal-GIF

A complete technical comparison of PaintShop Pro Image and SealedMedia SoftSeal GIF — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature PaintShop-Pro-PSP SoftSeal-GIF
Transparency (Alpha) Yes ✕ No
Animation Support ✕ No ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
PaintShop Pro Image
image/x-paintshoppro
Extension
.psp.pspimage.tub.pat
Container PSP Chunk-based Format
Compression Uncompressed / RLE (Run-Length Encoding) / LZ77
Algorithm
RLELZ77
Color Depth 8-bit (Indexed), 16-bit (Grayscale), 24-bit (RGB), 32-bit (RGBA), 48-bit (High Color)
Developed by Jasc Software / Corel Corporation (Alludo)
Released 1990
Magic Bytes
7E 42 4B 00
Full PaintShop-Pro-PSP reference →
SealedMedia SoftSeal GIF
image/vnd.sealedmedia.softseal.gif
Extension
.sgif.sealed-gif
Container SealedMedia SoftSeal Wrapper
Compression Encrypted Payload (LZW)
Algorithm
AES EncryptionLZW (Internal GIF payload)
Color Depth Encrypted Payload (Historically up to 8-bit Indexed)
Developed by SealedMedia (Acquired by Oracle Corporation)
Released Late 1990s
Magic Bytes
Unknown (Proprietary SealedMedia Container)
Full SoftSeal-GIF reference →

Browser Support Comparison

Browser PaintShop-Pro-PSP SoftSeal-GIF
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
PaintShop-Pro-PSP

PaintShop-Pro-PSP Strengths

  • Provides robust, non-destructive editing capabilities with full support for vector layers, adjustment layers, and layer blend modes
  • Historically offered a highly capable and affordable alternative to Adobe Photoshop's PSD format for Windows users
  • Features proprietary support for 'Picture Tubes' (.tub), a unique brush technology that paints sequential or random raster objects along a path
Limitations
  • Deeply proprietary format tied exclusively to the Corel/Alludo ecosystem
  • Third-party software support (like GIMP or ImageMagick) is often limited to parsing older .psp files, frequently failing to render complex layers in modern .pspimage files
  • No support in modern web browsers; must be exported to a flattened web format (JPEG/PNG) for online viewing
SoftSeal-GIF

SoftSeal-GIF Strengths

  • Provided robust, persistent security that traveled with the file, ensuring images could not be leaked even if sent outside the corporate firewall
  • Enabled dynamic revocation, meaning administrators could instantly kill access to a file globally
Limitations
  • Completely proprietary and dependent on an active authentication server; if the DRM server dies, the image is permanently locked
  • Zero support in modern operating systems, web browsers, or standard image editing suites without heavy enterprise client installations
  • Often caused massive friction for legitimate end-users trying to view documents

When to choose which format

PaintShop-Pro-PSP
Use PaintShop-Pro-PSP when…
  • PaintShop Pro Multi-layer Project Archival
  • Digital Art and Photo Retouching
  • Picture Tubes (.tub) and Custom Patterns (.pat)
SoftSeal-GIF
Use SoftSeal-GIF when…
  • Enterprise Information Rights Management (IRM)
  • Secure Distribution of Corporate Assets
  • Revocable Medical, Legal, or Financial Imaging

More comparisons

PaintShop-Pro-PSP vs ACES → SoftSeal-GIF vs ACES → PaintShop-Pro-PSP vs APNG → SoftSeal-GIF vs APNG → PaintShop-Pro-PSP vs AVCI → SoftSeal-GIF vs AVCI → PaintShop-Pro-PSP vs AVCS → SoftSeal-GIF vs AVCS → PaintShop-Pro-PSP vs AVIF → SoftSeal-GIF vs AVIF → All comparisons →
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