<h1 id="flux.2-ultrahd-raw-vae">FLUX.2 UltraHD RAW VAE</h1>This VAE works with all FLUX.2 models including Klein, FLUX.2, and ErnieQuick Assessment:<ol><li>Color enhancement by both increasing number of colors used, and a slight increase in saturation, without luminance or contrast corruption.</li><li>Increase in sharpness/gradient energy</li></ol>The detailed stats are found below, note while the model is 4.1x "worse" on LPIP's FLUX.2 scored an insane 0.0073 both scores are magnitudes of order below human perception.Side Note: While the video effect showing the enhancement is not as eye catching or dramatic as my other VAE's the amount of failed trainings exceeded double digits to create a VAE with a LPIPS close to FLUX.2<hr /><h3 id="direct-metric-comparison-(150-image-test-vs-base-flux.2)">Direct Metric Comparison (150 Image Test VS Base FLUX.2)</h3>LPIPS<ul><li>FLUX Base: 0.0073</li><li>UltraHD RAW VAE: 0.0303</li><li>Difference: 4.1× higher</li><li>Meaning: Less reconstruction-faithful but more enhancement-oriented</li></ul>Gradient Energy<ul><li>FLUX Base: 405.5</li><li>UltraHD RAW VAE: 633.5</li><li>Difference: +56%</li><li>Meaning: Significantly sharper detail and stronger edge enhancement</li></ul>Unique Colors<ul><li>FLUX Base: 37,369</li><li>UltraHD RAW VAE: 39,184</li><li>Difference: +4.9%</li><li>Meaning: Richer color variation and smoother HDR gradients</li></ul>Brightness Bias<ul><li>FLUX Base: 0.0047</li><li>UltraHD RAW VAE: 0.0030</li><li>Difference: Slightly improved</li><li>Meaning: Excellent luminance preservation</li></ul>Contrast Gain<ul><li>FLUX Base: 0.984</li><li>UltraHD RAW VAE: 0.983</li><li>Difference: Nearly identical Meaning: HDR tone and dynamic range preserved</li></ul>Red Shift<ul><li>FLUX Base: +0.0048</li><li>UltraHD RAW VAE: +0.0188</li><li>Meaning: Slightly warmer red response</li></ul>Green Shift<ul><li>FLUX Base: -0.0037</li><li>UltraHD RAW VAE: -0.0104</li><li>Meaning: Minor reduction in green balance</li></ul>Blue Shift<ul><li>FLUX Base: +0.0181</li><li>UltraHD RAW VAE: +0.0434</li><li>Meaning: Stronger blue/cyan HDR emphasis</li></ul>SummaryFLUX.2 UltraHD RAW VAE is designed for HDR enhancement, texture recovery, sharper detail, richer gradients, and cinematic rendering rather than strict pixel-perfect reconstruction. Compared to the base FLUX VAE, it produces substantially stronger edge detail, improved color richness, and enhanced microcontrast while maintaining stable brightness and contrast behavior.

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