ImageDrawLine

ImageDrawLine draws a straight line from one normalized point to another on a transparent RGBA canvas, with a thickness you control and anti-aliasing that actually looks decent. It sounds trivial, but a clean, thick, compositable line is genuinely annoying to produce in stock ComfyUI - this gives you one in a single node.

How it works

Same pipeline as every Allor draw node: RGBA canvas, PIL ImageDraw.line, supersample by SSAA, downscale with method, output a single IMAGE tensor. The coordinates are normalized fractions of the canvas - 0 is one edge, 1 is the opposite edge - which means the same values work at any canvas size.

Inputs that matter:

• width / height - canvas size, default 256×256.
• start_x / start_y, end_x / end_y - the line's endpoints as 0–1 fractions. Defaults run from top-left (0,0) to bottom-right (1,1) - a diagonal. For a horizontal line across the middle, use 0, 0.5 → 1, 0.5.
• size - line thickness in pixels, default 1.
• red / green / blue / alpha - color, alpha defaulting to 1 (opaque).
• SSAA (default 4) and method (default lanczos).

Where people get burned

Two things. First, the line can sit partially off-canvas - an endpoint of exactly 1 means the line's edge is flush against the border, and with a thick size the outer half of the stroke gets clipped. Pull endpoints slightly inside (e.g. 0.02–0.98) if you want a fully visible line. Second, the output is RGBA with a transparent background, so a lone line floats on a checkerboard in Preview - expected behavior for compositing, surprising if you wanted a solid backdrop.

Why you'd use it

Separator rules, grid lines, arrow shafts (composite the head on top), underline effects, or any vector-ish element you're layering over a generated image. Because the output has real alpha, it blends rather than hard-stamping.

Installing Allor

Part of the Allor Plugin (Nourepide/ComfyUI-Allor), ~90 nodes from early 2024:

cd ComfyUI/custom_nodes
git clone https://github.com/Nourepide/ComfyUI-Allor
cd ComfyUI-Allor
pip install -r requirements.txt

Restart, or search "Allor Plugin" in ComfyUI Manager - the more reliable route given the pack's history of manual-install import errors. Dependencies are rembg + onnx; drawing needs no models.

Gotchas that apply to the whole pack

The repo was rebased to strip images from history (shrank ~344×), so auto-update can occasionally break - the README's update-troubleshooting docs cover it; delete-and-reclone is the blunt fix. [Allor] console lines at startup are the pack writing config.json and checking updates, not an error.