Sumitc13/Flux-Kontext-exposure-control-LoRAs

Exposure Control LoRAs for FLUX.1 Kontext (dev)

These are LoRAs trained to control the exposure of images generated with FLUX.1 Kontext (dev), a state-of-the-art image editing model from Black Forest Labs. These LoRAs allow you to increase or decrease the exposure value (EV) of the output image.

How to Use

• To decrease exposure, use the LoRAs with negative EV values and their corresponding trigger words (e.g., ev-2 for ev-2.safetensors, ev-4 for ev-4.safetensors).
• To increase exposure, use the LoRAs with positive EV values and their corresponding trigger words (e.g., ev+2 for ev+2.safetensors, ev+4 for ev+4.safetensors).
• Adjust the LoRA weight to control the intensity of the effect. A weight of 1 is a good starting point.
• Trigger words are the same as the LoRA name without the extension (e.g., ev+2, ev-2).

ComfyUI Workflow for HDR Image Generation

These LoRAs work perfectly with ComfyUI to generate multiple exposure images that can be combined into HDR (High Dynamic Range) images.

HDR Processing with ComfyUI

For creating professional HDR images using these exposure LoRAs, use the Luminance Stack Processor custom nodes:

🔗 GitHub Repository: Luminance Stack Processor

This custom ComfyUI node allows you to:

• Merge different exposure level images (generated with these LoRAs)
• Create high dynamic range images using advanced algorithms
• Export professional 32-bit EXR files with preserved HDR values
• Use the Radiance Fusion Algorithm for enhanced HDR processing

Workflow Process:

1. Generate images with different LoRAs (ev-4, ev-2, ev+2, ev+4)
2. Use the Luminance Stack Processor nodes to combine exposures
3. Export as HDR EXR files with full dynamic range preservation

Complete ComfyUI workflow examples are available in the repository's /workflow directory.

Examples and Visual Guide

ComfyUI Workflow Setup

Complete workflow setup showing how to use the exposure LoRAs in ComfyUI

Exposure Comparison Examples

Indoor Scene - Light Bulb Comparison showing the same bulb scene with different EV settings: Original, EV+4, EV+2, EV-2, EV-4

Outdoor Scene - Landscape Comparison showing the same landscape with different EV settings: Original, EV+4, EV+2, EV-2, EV-4

Advanced Feature: Highlight Clamping Reduction

Example showing reduced highlight clamping for better dynamic range preservation

Note: These comparison strips demonstrate how each LoRA affects the same scene with different exposure values, from underexposed (EV-4) to overexposed (EV+4).