Unify colormaps: render-time apply (pseudocolor) + pipeline-based decode

CHANGELOG.md

@@ -1,9 +1,17 @@
 # Change Log
 
-## 1.7.0
+## 1.8.0
+
+- Add more compression support
+- Improve colormap support
+
+## 1.7.0 (2026-06-14)
 
 - Add more file formats: webp, hdr, jxl, tga, bmp and ico files
 - Renamed extension to Scientific Image Visualizer
+- Improving the collection feature to have multiple images next to each other.
+- Adding a layer feature allowing to compose multiple images with each other.
+- Reworked colormaps into a unified feature: apply a colormap (pseudocolor) to any single-channel image as a non-destructive render setting that also works in layers, and decode colormapped RGB images back to float through the central pipeline.
 
 ## 1.6.0 (2026-03-30)
 

CLAUDE.md

@@ -87,7 +87,8 @@ The webview ([media/imagePreview.js](media/imagePreview.js)) uses ES6 modules fo
 - **ZoomController**: Pan/zoom with mouse/trackpad
 - **MouseHandler**: Pixel inspection, hover effects
 - **HistogramOverlay**: Interactive histogram with draggable overlay, linear/sqrt scale toggle, bin hover tooltips, and per-channel display
-- **ColormapConverter**: Converts colormap images to float values using various colormaps (viridis, plasma, jet, etc.)
+- **Colormaps** ([media/modules/colormaps.js](media/modules/colormaps.js)): Shared source of truth for all colormaps (viridis, plasma, jet, etc.) — `getColormapLut()` (forward 256-entry RGB LUT, used for render-time "apply"/pseudocolor) and `rgbToColormapIndex()` (cached 32³ inverse cube, used for "decode")
+- **ColormapConverter** ([media/modules/colormap-converter.js](media/modules/colormap-converter.js)): "Decode" direction — recovers scalar float values from a colormapped RGB image using the shared inverse lookup
 
 ### Status Bar Integration
 Comprehensive status bar system with specialized entries:
@@ -144,7 +145,8 @@ All commands registered with `tiffVisualizer.` prefix ([src/imagePreview/command
 - **Collection**: `browseAndAddToCollection` — adds a file to the active preview's image collection; accepts an optional URI (Explorer context menu) or prompts with a glob/path picker (command palette)
 - **Comparison**: `selectForCompare`, `compareWithSelected`, `openComparisonPanel`
 - **Filters**: `filterByMask`, `toggleNanColor`
-- **Colormap conversion**: `convertColormapToFloat` - converts colormap images to float values
+- **Colormap apply**: `applyColormap` - sets the render-time `displayColormap` (pseudocolor) on single-channel images; non-destructive and applied in `ImageRenderer.render()`, so it also works in layers
+- **Colormap decode**: `convertColormapToFloat` - recovers scalar float values from a colormapped RGB image (inverse colormap)
 - **Reset**: `resetAllSettings`
 - **Histogram**: `toggleHistogram` (Ctrl+H / Cmd+H)
 - **Color picker mode**: `toggleColorPickerMode` — switches pixel inspector between original and modified (gamma/exposure) values
@@ -294,7 +296,8 @@ media/
 │   ├── zoom-controller.js            # Pan/zoom functionality
 │   ├── mouse-handler.js              # Pixel inspection
 │   ├── histogram-overlay.js          # Histogram visualization
-│   └── colormap-converter.js         # Colormap to float conversion
+│   ├── colormaps.js                  # Shared colormap LUTs + inverse lookup (apply & decode)
+│   └── colormap-converter.js         # Colormap decode (RGB → float, inverse colormap)
 ├── geotiff.min.js                    # TIFF processing library (copied from node_modules)
 ├── parse-exr.js                      # EXR processing library
 ├── upng.min.js                       # PNG decoding