In short
Word, Excel and PowerPoint files with large, high-resolution images can now open more reliably. Images are prepared for the current display size when retaining their full source resolution would be excessive, and a later zoom can request a sharper result.
- Display poster-sized and camera images that previously crossed the decoded-image limit.
- Support more TIFF images, including common black-and-white, grayscale, colour and Group 4 files.
- Keep embedded SVGs, PowerPoint text and styled Excel sheets dependable in worker mode.
Smoother, more faithful viewing
PowerPoint zoom now keeps the viewed slide in place while the sharper render settles, including at the maximum zoom level. Placeholder text, built-in table styles and several chart layouts also more closely follow their Office appearance.
The same image handling is available across DOCX, XLSX and PPTX, in both regular and worker rendering modes.
Upgrading
Most applications can upgrade without code changes. The new image policy is automatic, and applications with a specific memory or image-quality requirement can optionally adjust imageResources.
TIFF support remains optional. Without the TIFF module, the affected image is shown as unavailable while the rest of the document remains viewable. Add @silurus/ooxml/tiff only when those images need to be displayed.
Technical note
Adaptive image sizing remains bounded by non-disableable source, dimension and per-image safety limits. imageResources controls the decoded working budget and can select strict rejection when an application prefers it; it is not a promise about total browser or GPU memory.