WOF Print Intent

Not every node processes pixels. WOFPrintLab produces zero images, touches zero latents, and is still one of the more interesting nodes in this pack - because it's the pack's attempt to capture intent as machine-readable metadata. It defines a "print intent" - tonal emphasis, contrast grade, paper stock, finish, developer, agitation - and hands it downstream as a WOF_PRINT_INTENT object that other nodes can validate against.

The clue is in the name: WOF is the pack's "WOF Post-Processing Schema," a defined metadata format anchored to a schema file in the repo. The node's own description is blunt about it: "Does not process images - downstream nodes consume the print_intent dict." So what's it for? Reproducibility and self-documentation. You say what print you intended, and the pipeline can check that your choices are coherent - a pushed-to-3200 stock demanding a Grade 5 contrast class with a soft-high-key tonal emphasis is the kind of mismatch the schema exists to catch.

How it works

Three required fields define the core intent:

• tonal_emphasis - the character of the print: neutral, full_scale, high_key_soft, high_key_contrast, low_key, crushed_blacks, zone_system_iii_viii, highlight_detail_viii, shadow_detail_iii, compressed_midtones, solarized, or undefined. These read like a photographer's brief, because that's exactly what they are.
• contrast_class - the paper grade the print targets: grade_00 through grade_5. This is the metadata twin of the PrintLab contrast filters.
• paper_stock - a string naming the paper (default ilford_galerie_fb_matt).

Then the optional fields add the full darkroom recipe: print_finish (none, straight, selenium_light/heavy, warmtone, cooltone, lith) with print_finish_strength, developer (default "Dektol 1:2"), temperature (15–25°C), development_time (0.5–30 min), agitation (stand/standard/continuous), and a free-text notes field.

Output is a single print_intent of type WOF_PRINT_INTENT. That dict is what downstream WOF-aware nodes consume - PromptLab, for example, accepts a wof_print_intent input and validates that the prompt's tonal/contrast metadata is compatible with the selected film stock and era.

When to use it

• When you're building reproducible workflows and want the "how should this print look" decision recorded in the graph, not in your head.
• When you want PromptLab's validation to steer prompt choices toward a coherent stock/print combo.
• Honestly, when you're new to it, it's a way to learn the vocabulary of darkroom intent without touching chemicals - the schema is a surprisingly good glossary.

Install

Pack standard:

cd ComfyUI/custom_nodes
git clone https://github.com/AlbertJBurton/comfyui-jbnodes.git
cd comfyui-jbnodes
pip install -r requirements.txt

Restart ComfyUI, or ComfyUI Manager → "comfyui-jbnodes."

Gotchas

• If no downstream node consumes print_intent, this node does literally nothing to your image. Don't drop it into a graph expecting a visual change.
• The schema is the pack author's own design, not a community standard - don't expect other packs to understand WOF_PRINT_INTENT.
• The paper_stock, developer, and notes fields are free text, so spelling consistency is on you - the schema validates enum fields but won't catch a typo'd paper name.