OPF Image Treatment
Watermark
A low-opacity image reinforces brand or confidentiality without becoming primary content.
Best Fit
Internal decks, confidential briefings, appendix slides, and brand identity pages.
Photography Guidance
Use simple logos or symbols, not detailed photos. Keep opacity low and position away from body copy.
Avoid
Avoid watermarks on already busy slides or where legal text requires full readability.
Treatment Practices
Use watermarks sparingly and keep them low contrast.
Avoid placing watermarks behind small text.
Prefer vector-like transparent image assets for logos.
OPF Config
image-treatments:watermark{
"design": {
"brand": {
"watermark": {
"url": "https://example.com/watermark.png",
"opacity": 0.08
}
}
}
}Preview this config live at pptx.dev/playground.
Related How-To Articles
Playground deep linkHow to Set Slide Backgrounds in PowerPoint Presentations
Control slide backgrounds in pptx.dev presentations — choose between light and dark modes, use background images, and apply color scheme backgrounds.
How to Add Headers, Footers, and Slide Numbers in PowerPoint
Configure headers, footers, slide numbers, and date fields to add professional navigation and branding to your presentations.
General Image Rules
Crop with intent
Choose fit, position, and size based on the subject and message, not just available space.
Protect readability
Text over images needs enough contrast, an intentional overlay, or a separate text surface.
Respect image truth
Avoid filters or crops that distort evidence, screenshots, charts, or compliance imagery.
Keep a system
Use a small set of image treatments consistently so photo-heavy decks still feel coherent.