Unify colormaps: render-time apply (pseudocolor) + pipeline-based decode#9
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Rework the colormap feature into one unified, non-destructive design with
two directions, both flowing through the central ImageRenderer pipeline so
they work for every format and for layers.
- Add shared media/modules/colormaps.js as the single source of truth:
getColormapLut() (cached 256-entry RGB LUT) and rgbToColormapIndex()
(cached 32^3 inverse cube for O(N) decode).
- Apply ("add color"): new displayColormap render setting, hooked once in
ImageRenderer.render() — single-channel grayscale output is remapped
through the colormap LUT (NaN pixels preserved). Reversible and
non-destructive; works in layers since the compositor uses the same path.
- Decode ("remove color"): rewrite the broken canvas-mutating converter.
The decoded scalar becomes a first-class single-channel float source that
re-renders through ImageRenderer (so normalization/gamma/apply-colormap all
work) and feeds the pixel inspector via a new decodedValueProvider.
- UX: context menu splits into "Apply Colormap…"/"Remove Colormap" for
single-channel images (fixes the missing option on float TIFFs) and
"Decode Colormap to Float" for RGB images; add tiffVisualizer.applyColormap
command; persist displayColormap across tab switches.
- Guard the PNG lazy-native fast path so a requested colormap forces the
central pipeline.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
…o norm boundary info text
kleinicke
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Jun 17, 2026
Unify colormaps: render-time apply (pseudocolor) + pipeline-based decode
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Summary
Reworks colormaps into one unified, non-destructive feature with two directions, both flowing through the central ImageRenderer pipeline (so they work for every format and for layers).
Issues with the colormaps were reported in #2
media/modules/colormaps.js—getColormapLut()(cached 256-entry RGB LUT) andrgbToColormapIndex()(cached 32³ inverse cube → O(N) decode).displayColormaprender setting, hooked once inImageRenderer.render(): single-channel grayscale is remapped through the LUT (NaN preserved). Reversible, non-destructive, works in layers.tiffVisualizer.applyColormapcommand;displayColormappersists across tab switches.formatInfo(full menu/status bars restored); gamma-mode normalization labels are type-aware (0-1float,0-255/0-65535integer).Testing