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Fix GIMP 3.2 tool bugs: color handling, gradient, pixel read, close/undo, server feedback - #41
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…ndo, server feedback
Several tools crashed or silently produced wrong output on GIMP 3.2. Root
causes were GIMP 3.2 API changes and Gegl's linear-vs-sRGB color handling.
- Colors: add a `_color()` helper accepting hex, named colors, `rgb()/rgba()`,
and `[r,g,b(,a)]` lists (0-255 or 0-1), normalizing to an sRGB hex string.
Raw `Gegl.Color.new("rgb(...)")` and `set_rgba()` store values as *linear*,
so `rgb(255,190,216)` clamped to white and `rgb(1.0,...)` looked washed out;
only hex parses as sRGB. All ~20 color call sites now route through it.
- gradient_fill: replace the broken GEGL-graph path (normalized coords, wrote
to a shadow buffer, produced no visible output, ignored the selection) with
`Gimp.Drawable.edit_gradient_fill`, which honours the selection.
- get_pixel_color: read the buffer as non-linear "R'G'B'A u8" instead of the
linear floats from `get_pixel().get_rgba()` (an sRGB (255,223,237) pixel was
reported as (255,188,216)).
- close_image: GIMP 3.2 has no `Gimp.get_displays()`/`Display.get_image()`, so
track created displays in a registry keyed by image id and delete the tracked
display before `image.delete()` (which no-ops while a display is attached).
- undo/redo: GIMP 3.2 exposes no scriptable undo history; return a clear
message instead of crashing with AttributeError.
- Server start: menu actions only printed to the console. Add UI-visible
`Gimp.message()` feedback (via a temporary MESSAGE_BOX handler), reporting the
real bind outcome for Start, plus Restart and status.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. WalkthroughThe plugin now restores GIMP message handlers after notification errors. The ChangesColor handling and notification safety
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The PR updates GIMP 3.2 color handling, gradient and pixel operations, image closing, undo messaging, and server feedback; no actionable merge-blocking risk remains at the current head. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 2
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Inline comments:
In `@gimp-mcp-plugin.py`:
- Around line 148-152: Update the color parsing logic around the visible
RGB/alpha conversion so RGB channels retain their existing independent scaling
while alpha is parsed independently: fractional alpha values in the 0–1 range
must map to 0–255 opacity regardless of RGB scale, while preserve appropriate
handling for alpha already expressed on a 0–255 scale. In gimp-mcp-plugin.py
lines 148-152, change the alpha conversion accordingly; in CLAUDE.md lines
78-86, document the corrected independent RGB scaling and alpha rules.
- Around line 123-126: Update the message handling sequence around Gimp.message
to wrap the message call in a try/finally block, ensuring
Gimp.message_set_handler(prev) always executes even when messaging raises.
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CLAUDE.mdgimp-mcp-plugin.py
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- _color: scale alpha independently of RGB. CSS rgba() uses 0-255 for RGB but 0-1 for alpha, so rgba(255,0,0,0.5) was rounding alpha to 0 (fully transparent). Alpha <= 1 is now read as 0-1, else as 0-255; both rgba(255,0,0,0.5) and rgba(255,0,0,128) give 50% opacity. - _notify: restore the message handler in a finally block so a raising Gimp.message() can't leave the handler stuck on MESSAGE_BOX. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Addressed both review comments in 1527c6f:
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Thanks for building this — it's a genuinely useful bridge to GIMP. While using it on GIMP 3.2.4 I hit a few tools that crashed or silently produced wrong output. This PR fixes them. Root causes were GIMP 3.2 API changes and Gegl's linear-vs-sRGB color handling.
Fixes
Gegl.Color.new("rgb(...)")andset_rgba()store components as linear, not sRGB — sorgb(255,190,216)clamped to white andrgb(1.0,...)came out washed-out. Only hex parses as sRGB. Added a_color()helper that accepts hex, named colors,rgb()/rgba(), or[r,g,b(,a)]lists (values read as 0-255 when any exceeds 1, else 0-1) and normalizes everything to an sRGB hex string. All ~20 color call sites route through it.gradient_fillproduced no output. The GEGL-graph path used normalized (0..1) coordinates, wrote to a shadow buffer, and ignored the active selection. Replaced withGimp.Drawable.edit_gradient_fill, which respects the selection and writes correct sRGB pixels.get_pixel_colorreturned wrong values.get_pixel().get_rgba()returns linear floats — an sRGB(255,223,237)pixel was reported as(255,188,216). Now reads the buffer as non-linear"R'G'B'A u8".close_imagecrashed withAttributeError: 'Gimp' object has no attribute 'get_displays'. GIMP 3.2 has noGimp.get_displays()/Display.get_image(), andimage.delete()no-ops while a display is attached. Now tracks created displays in a registry keyed by image id and deletes the tracked display first.undo/redocrashed withAttributeError: 'Image' object has no attribute 'undo'. GIMP 3.2 exposes no scriptable undo history; they now return a clear message instead.Gimp.message()feedback (via a temporaryMESSAGE_BOXhandler) that reports the real bind outcome for Start, plus Restart and status.CLAUDE.mdis updated with the sRGB-vs-linear gotcha, since it caused most of the confusion.Testing
py_compileclean.ruff checkintroduces no new violation categories and net-reduces existing findings by 5 (removed some blind excepts / try-except-pass).🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
rgb(),rgba(), and numeric color formats across editing and export tools.Bug Fixes
Documentation