if in Comfyui there is a node that allows saving HDRI files (or when it will be available) - then both
P.S.: https://github.com/city96/ComfyUI_ColorMod - test it (maybe)

@OliviaRossi interesting do you happen to have the name of that particular node ?

Can anyone recommend a specific node to save images as hdr or exr in ComfyUI?

@VRNardoDavincAI https://github.com/city96/ComfyUI_ColorMod

@linvanchene https://github.com/city96/ComfyUI_ColorMod

This is just 360. A lot of people just call them HDRI because they don't understand what they are. HDRIs are made of of multiple images all taken with slightly different exposure settings and then combined back into one image, I doubt any Comfy node is doing that, more like it's just creating the 360 effect.

@nagopif737meidec547 panoramic images can be 8-bit (regular jpg) or higher (then we can call them HDRI if more than 8-bit information is being processed and saved into the output file) - but for that, we have to run ComfyUI not in 8-bit mode ;)

@OliviaRossi Panoramic or 360 pngs or jpegs are not HDRI no matter what bitrate you save them in. Technically I could open a 360 png image in GIMP and then save it as 16 bit but it still wouldn't be a HDRI because the data that makes it a HDRI wouldn't be there. High Dynamic Range comes from that extra data. To create a HDRI you either need to take a bunch of photos at the time with different exposure settings or use a RAW image so you can manipulate the exposure in post, then you would layer up those different exposed layers to create the HDRI. AI generated images don't have exposure control.

It looks like the Comfy node is basically trying to fake an HDRI effect by probably changing levels, tone, brightness and contrast values and then combining them again. You might get some ok results from it but it's not a true HDRI image.

@nagopif737meidec547 Yup you are right. The process of making an HDRI is what makes it an HDRI. Bitrates, resolution or file format does not make an image a HDRI. Btw the images generated here are what's called a reflection map. It is just a 360 image that is useful for adding reflections, and not much for actual lighting. Any blender folks here, you can add your own lighting corresponding to the image generated using this Lora.

@nagopif737meidec547 yes, any file re-saved as 16 bit - is not immediately HDRI, but if is generated as such (which is not possible when ComfyUI normally runs as 8-bit, unless if we set commandline flag for it) - then it can technically be considered as HDRI, but also, regular SDXL models do not produce full spectrum of light intensities - for that matter we use CosXL patched models. So, it is very hard to push for true HDRI but (probably) possible.

@ArchisK 3D software like Blender allows you to create a virtual environment and render it as a 360° panoramic image with high dynamic range (HDRI). This offers more control over the lighting and scene compared to photography. - theoretically same process can be done in ComfyUI, but we have to run it as 16-bit instead of default 8-bit via commandline switch, and use CosXL patched model for full spectrum of shades of gray (luminosity)

@OliviaRossi hmm...I really doubt that images generated from Comfyui will have multiple exposure images combined, or enough light data to accurately light the environment in extreme low or high light scenarios. But then I am not aware of the process being followed in comfyui.

@ArchisK no, ComfyUI is NOT combining images - it is not needed! (that method IS ONLY needed for traditional digital photography - when we are creating HDRI by combining multiple exposures) - for software created images NOBODY is combining ANYTHING, either software is capable to generate high intensity range AND SAVE it properly, or NOT capable. In case of ComfyUI - the default way we run it - NO - it is not capable even to generate HDRI image!

But, if we force it to run in 16-bit (not on every hardware!!!) and use additional nodes capable of saving those images - then, we can "consider" those outputs as technically close to HDRI

@OliviaRossi I think you're missing the point still. HDRI is a process, it being 16bit is a result of that process. Just making an image 16bit at creation time doesn't mean it's a HDRI. Normal maps for instance are usually 16bit but they are not considered HDRIs. The comfy node is basically trying to emulate the HDRI process.

It's basically impossible to create a true HDRI with AI unless it's possible at some point to have exposure control for generated images, which I'm not sure would even be possible. Until then it's basically faking he process.

For normal images you would see on screen it usually has brightness values stored for each pixel, they will go from a level of 0 to 255. For a true HDRI image that range can be in the thousands or even millions. That's why it needs to be 16bit to store all that extra data.

@nagopif737meidec547 so, you think that every other 3D render engine that outputs HDRI - in background combines multiple renders into one ??? if light intensity is more than 8-bit = we have HDRI, whether it is 12 bit or higher, question is - can we push ComfyUI to generate and properly save it

The term HDRI is used differently in different fields.

Those coming from the photography side use the term HDR for their photoshop practice to combine images with depth data.

Those who have experiences with a raytraced 3D render engines know that rays are sent out into the 3D scene to actually calculate the light situation. The result can be converted into an .exr or .hdr.

Source for the confusion here may be that AI image generators are not "raytracers".

@linvanchene Exactly!!! ❤️❤️❤️

So, is it possible to generate images with ColorMod and this LoRa that can then be used in Blender, and that in a somewhat HDR quality?

@denrakeiw no need for Blender, (Blender can do it on its own) - you should try it in ComfyUI - but keep in mind the commandline switches for FP16

I have an idea now. But we'll see if it pans out.

@thebrownsauce184 Good one, lmao

what do you mean hdri-fix pass? another model or smth?

@MonsterSlayer28 i meant hires fix, my bad. Surely you know about hires fix