ERNIE-Image Hidden Feature: Prompt Enhancer On or Off? A Clear Guide

If you've used ERNIE-Image, you've probably encountered these situations:

Sometimes image quality is great, sometimes it's terrible
You clearly changed the prompt, but the image stayed exactly the same
You specified "Hello World", and the image showed Chinese text

The problem may not be with your prompt, but with a toggle you may have never noticed — the Prompt Enhancer (PE).

This article doesn't discuss architecture or theory. It answers one practical question: when to turn PE on, and when to turn it off.

PE in One Minute

PE is ERNIE-Image's built-in prompt rewriting module. You input a sentence, PE rewrites it into a more professional, detailed description, then generates the image.

PE on = You write simply, AI fills in the gaps
PE off = You write what you get, model does exactly what you say

That's it.

Turn PE On (Just do it, no hesitation)

✅ Scenario 1: You only wrote one line

Input: A cat on a table
Effect: PE auto-fills lighting, composition, style details
Result: Quality is better than if you didn't write those details

Rule: The shorter the prompt, the larger PE's benefit.

✅ Scenario 2: You don't know how to write prompts

Don't know what "Rembrandt lighting" or "shallow depth of field" means? You don't need to. PE automatically adds these professional terms for you.

Comparison:

State	Your Input	What the Model Actually Receives
PE off	`Sunset by the sea`	`Sunset by the sea`
PE on	`Sunset by the sea`	`Coastline under golden sunset, waves gently hitting rocks, warm orange sky, long exposure photography style`

✅ Scenario 3: Fast generation, brainstorming

PE + ERNIE-Image Turbo (8-step inference) = fastest workflow.

Typical usage:

Input one line
Turn on PE, hit generate
Not satisfied? Change a word, try again
20 images in 10 minutes

Best for: Inspiration exploration, concept validation, quick creative testing.

✅ Scenario 4: Chinese input, Chinese output

PE is relatively friendly to Chinese input — expanded descriptions are typically in Chinese. If you're generating regular images (no precise text), Chinese users can safely turn on PE.

Turn PE Off (Must, no negotiation)

❌ Scenario 1: Need precise text rendering

This is the most important off scenario.

Your need: Poster reads "SUMMER SALE"
PE's behavior: May change "SUMMER SALE" to other text, or translate to Chinese
Result: The image shows text you didn't want

Turning off PE is the only reliable approach.

❌ Scenario 2: You already wrote a detailed prompt

If your prompt looks like this:

Close-up product photograph of a matte white ceramic coffee mug on a dark slate surface, dramatic side lighting from the left creating long shadows, moody dark atmosphere, high-end commercial photography, 4K detail

You already wrote lighting, material, composition, style. PE expanding further is overkill — it may add descriptions that conflict with yours.

❌ Scenario 3: Fixed seed iteration

You're adjusting prompts with a fixed seed, changing one word at a time:

Iteration 1: a cat → (PE expands to A)
Iteration 2: a black cat → (PE expands to B)
Iteration 3: a black cat on sofa → (PE expands to C)

You changed one word, but PE's entire expansion changed. You can't tell which change caused the result.

Off PE = isolate variables = precise iteration.

❌ Scenario 4: You pursue unique style

PE's expansion has templating tendencies — product photos always become "soft light + shallow depth of field", landscapes always become "golden hour + fog".

If you want atypical styles (minimalist, dark, abstract), PE's templated expansion may conflict with your direction.

Quick Decision Table

Your Situation	PE Toggle	One-line Reason
Short prompt (≤15 chars)	✅ On	PE fills in details for you
Don't know how to write prompts	✅ On	Built-in prompt assistant
Fast generation	✅ On	Fastest workflow
Chinese input, regular image	✅ On	PE is friendly to Chinese
Need precise text	❌ Off	PE rewrites text content
Already have detailed prompt	❌ Off	Overkill
Fixed seed iteration	❌ Off	Isolate variables
Pursuing unique style	❌ Off	Avoid templating
GGUF low-VRAM mode	❌ N/A	No GGUF version

How to Toggle PE

ComfyUI

In the PE node settings:

enabled = true → On
enabled = false → Off

Diffusers API

pipe(prompt="xxx", use_pe=True)   # On
pipe(prompt="xxx", use_pe=False)  # Off

Scenario.com Web Interface

Find the "Prompt Enhancer" checkbox on the generation page, check/uncheck.

Advanced Tips

Tip 1: Use PE to Find Direction, Then Turn Off for Final Polish

Input short prompt, turn on PE, generate preview
See PE's expansion direction
Manually adjust the expanded content (or modify based on it)
Turn off PE, generate final version with adjusted prompt

Essence: PE is your creative assistant, not the final decision maker.

Tip 2: Replace Built-in PE with a Stronger LLM

If you often need PE but are unsatisfied with its results:

Write professional-level prompts with GPT-4/Claude
Turn off PE in ERNIE-Image
Paste prompt and generate

Quality improves noticeably. The trade-off: API cost.

Tip 3: Use Negative Descriptions to Counter Templating

If you want atypical styles:

a product photo, dark moody lighting, NO soft light, NO commercial photography, dramatic contrast, edgy

Add exclusionary descriptions to tell PE what you don't want.

Common Misconceptions

Misconception 1: "PE on always means better quality"

Wrong. PE helps with short prompts, but harms with long prompts.

Misconception 2: "PE off is a downgrade"

Wrong. PE off means "precise control", not a downgrade. Professional users often turn PE off.

Misconception 3: "PE just adds content"

Wrong. PE is a rewriter — it changes your complete prompt content.

Misconception 4: "PE translating to Chinese is a bug"

Not a bug — it's normal behavior caused by training data distribution.

Summary: One-Line Rules

Short prompt → PE on
Long prompt → PE off
Need text → PE off
Need iteration → PE off
Unsure → Use PE to see direction, then adjust manually

PE is not magic — it's a tool. Understand its behavior, and you master its toggle logic.