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# ComfyUI-HQ-Image-Save
Add Image Save nodes for TIFF 16 bit and EXR 32 bit formats. Probably only useful if you're applying a LUT or other color corrections, and care about preserving as much color accuracy as possible.
## Nodes:
- Image
- Save Tiff (RGB 16bpc TIFF, useful if you're applying a LUT or other color corrections, and care about preserving as much color accuracy as possible.)
- Save EXR (RGB 32bpc EXR, mainly just for testing, it doesn't provide any improvement over TIFF in this situation, and it just takes up more file space.)
- Latent
- Save Latent EXR (4 channel latent -> RGBA 32bpc EXR)
- Load Latent EXR (images must be in the ComfyUI/input directory)
## Overview
Save images in TIFF 16 bit and EXR 32 bit formats, and save/load latent images as EXR
Don't expect any massive improvements in visible quality, this only passes through whatever is decoded by the VAE. From my testing there's an improvement in accuracy under the midpoint value per channel (0.5 raw, or ~0.215 gamma corrected), but still far less than what's actually possible within 16-bit depth.
Save EXR is mainly just for testing, it doesn't provide any improvement over TIFF in this situation, and it just takes up more file space.
![nodes](https://github.com/spacepxl/ComfyUI-HQ-Image-Save/assets/143970342/733fd3fa-ed85-430a-b772-3e84fede1675)
@@ -12,26 +19,29 @@ Here's an example scatterplot of raw R/G values from a generated image. You can
![comparison](https://github.com/spacepxl/ComfyUI-HQ-Image-Save/assets/143970342/0c12920a-5eae-4de2-83bc-3181fcbbbc64)
# Installation
For latent EXR viewing purposes, if you want a cheap approximation of RGB values from the four latent channels, use this formula:
```
r = (0.298 * r + 0.187 * g - 0.187 * b - 0.184 * a) * 0.18215
g = (0.207 * r + 0.286 * g + 0.189 * b - 0.271 * a) * 0.18215
b = (0.208 * r + 0.173 * g + 0.264 * b - 0.473 * a) * 0.18215
```
## Installation
Navigate to `/ComfyUI/custom_nodes/`
`git clone https://github.com/spacepxl/ComfyUI-HQ-Image-Save/`
If you already have `imageio` installed, you can skip this, but otherwise, use the install.bat (shamelessly borrowed from WASasquatch) to automatically install dependencies, or manually run `pip install -r requirements.txt` using the correct python for your ComfyUI install (embedded or system)
If you want to use Save EXR, you'll need to add an environment variable to your run script to [enable EXR support](https://github.com/opencv/opencv/issues/21928)
If you want to use the EXR nodes, you'll need to add an environment variable to your run script to [enable EXR support](https://github.com/opencv/opencv/issues/21928)
For example on Windows, run_nvidia_gpu.bat:
```
set OPENCV_IO_ENABLE_OPENEXR=1
.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --preview-method auto
pause
```
# Known Issues
## Known Issues
Image previews don't display correctly in the nodes, although they do auto-expand as if there's an image to show.
No metadata is saved to the images
- No metadata is saved to the images
- File Upload button is missing on the Load Latent EXR node