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The FLUX.1 [dev] Model is licensed by Black Forest Labs. Inc. under the FLUX.1 [dev] Non-Commercial License. Copyright Black Forest Labs. Inc.
IN NO EVENT SHALL BLACK FOREST LABS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH USE OF THIS MODEL.
FLUX.2 UltraHD RAW VAE
This VAE works with all FLUX.2 models including Klein, FLUX.2, and Ernie
Quick Assessment:
Color enhancement by both increasing number of colors used, and a slight increase in saturation, without luminance or contrast corruption.
Increase in sharpness/gradient energy
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
Direct Metric Comparison (150 Image Test VS Base FLUX.2)
LPIPS
FLUX Base: 0.0073
UltraHD RAW VAE: 0.0303
Difference: 4.1× higher
Meaning: Less reconstruction-faithful but more enhancement-oriented
Gradient Energy
FLUX Base: 405.5
UltraHD RAW VAE: 633.5
Difference: +56%
Meaning: Significantly sharper detail and stronger edge enhancement
Unique Colors
FLUX Base: 37,369
UltraHD RAW VAE: 39,184
Difference: +4.9%
Meaning: Richer color variation and smoother HDR gradients
Brightness Bias
FLUX Base: 0.0047
UltraHD RAW VAE: 0.0030
Difference: Slightly improved
Meaning: Excellent luminance preservation
Contrast Gain
FLUX Base: 0.984
UltraHD RAW VAE: 0.983
Difference: Nearly identical
Meaning: HDR tone and dynamic range preserved
Red Shift
FLUX Base: +0.0048
UltraHD RAW VAE: +0.0188
Meaning: Slightly warmer red response
Green Shift
FLUX Base: -0.0037
UltraHD RAW VAE: -0.0104
Meaning: Minor reduction in green balance
Blue Shift
FLUX Base: +0.0181
UltraHD RAW VAE: +0.0434
Meaning: Stronger blue/cyan HDR emphasis
Summary
FLUX.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.