grainy gradient background, transitioning smoothly from one color to another in a vintage-inspired palette. generative

achromatic aesthetic aged ai antique background blend color delicate distressed effect faded faint fill fuzzy generated gradient grainy grunge hazy hues mellow muted nostalgic oldfashioned overlay pastel retrotoned shaded shading smoothly soft softened subdued texture tinge tint tinted tonal transition transitioning vignette vintage vintageinspired weathered