backend/headless/fcbh/latent_formats.py

class LatentFormat:
    scale_factor = 1.0
    latent_rgb_factors = None
    taesd_decoder_name = None

    def process_in(self, latent):
        return latent * self.scale_factor

    def process_out(self, latent):
        return latent / self.scale_factor

class SD15(LatentFormat):
    def __init__(self, scale_factor=0.18215):
        self.scale_factor = scale_factor
        self.latent_rgb_factors = [
                    #   R        G        B
                    [ 0.3512,  0.2297,  0.3227],
                    [ 0.3250,  0.4974,  0.2350],
                    [-0.2829,  0.1762,  0.2721],
                    [-0.2120, -0.2616, -0.7177]
                ]
        self.taesd_decoder_name = "taesd_decoder"

class SDXL(LatentFormat):
    def __init__(self):
        self.scale_factor = 0.13025
        self.latent_rgb_factors = [
                    #   R        G        B
                    [ 0.3920,  0.4054,  0.4549],
                    [-0.2634, -0.0196,  0.0653],
                    [ 0.0568,  0.1687, -0.0755],
                    [-0.3112, -0.2359, -0.2076]
                ]
        self.taesd_decoder_name = "taesdxl_decoder"