Using Stable Diffision models for Colorization

[Dan64]

I changed some settings and the result became much closer to yours.
The issue is that I'm trying to achieve maximum color saturation, since that's the main reason I'm colorizing these videos.
I've attached the file you requested. If you have time to look at it, I'd be interested to know whether the differences I'm seeing are caused by my settings, my installation, or something else in the workflow.

P.S. I noticed that when I increase the colorization/inference steps to 4–6, the model sometimes starts generating non-existent objects or details that were not present in the original footage.

The problem is that if you ask to Qwen to improve the colors is some case it can add artifacts, for example this prompt: " "Colorize this black and white photo with realistic, vibrant colors while preserving skin tones. Strictly preserve all shapes, edges and background details." can produce images like this



or this



where the background is totally invented.

My prompt will provide more conservative colors, but will force Qwen to provide more consistent colors. You can try to experiment different prompts, but the risk of obtain artifacts is very high.

If you want to try to improve the quality try these settings:



if you have a RTX50 GPU, run the server in fp4 mode because the fp4 quantization is better and should reduce the risk of artifacts.

Dan