!AHTUNG! if you have troubles with samplers and schedulers then read this conversation.

This workflow presents my most efficient pipeline for rendering the high quality images with Krea2 Turbo checkpoint using the 2-stage approach (Text-to-Image _ HiRes Fix).

T2I stage gives the draft image with low details but good composition and colors.

HR Fix stage gives image textures and details.

Image File Prefix - path relative to ComfyUI/output + base name of the image and caption file to be saved as a result of the workflow execution

T2I Steps and HiRes Fix Steps - how much steps each of two passes will use. Both can be set in range of 4..8, but I recommend 4..6 for T2I and 4,5 for HiRes Fix.

T2I Sampler - I recommend Euler A or some other low contrast sampler for draft pass. If you set some contrast sampler then lower the T2I CFG Start Offset and probably T2I CFG Mid Offset to prevent overburned image.

HiRes Fix Sampler - feel free to experiment with; as far as you set not so big HiRes Fix Denoise you can play with many different samplers.

HiRes Fix Scheduler - if you want improve textures with lowest changes to general composition then use Zeta or Karras schedulers with HiRes Fix Denoise up to 0.77. Setting denoise higher than 0.77 most likely with lead to very blurry unreadable image. If you want significantly rewrite image at HiRes fix pass then use schedulers: simple, normal, beta (probably most sharp), ddim_uniform (also contrast).

Note on CFG offsets:

Those are parameters of the Details Daemon which allows us to directly control the CFG for different steps. Start Offset in deep negatives reduces the general contrast of the image and helps to avoid dithering, over-sharpen edges, overburned colors, harsh shadows.

Note on T2I Denoise: usualy we use T2I denoise == 1.0, but if you need additional knob to reduce the contrast and sharpness this parameter is very effective. 0.85..0.95 is good range to play with T2I Denoise.