WebPConfig.preprocessing

• alpha_compression
• alpha_filtering
• alpha_quality
• autofilter
• emulate_jpeg_size
• filter_sharpness
• filter_strength
• filter_type
• image_hint
• lossless
• low_memory
• method
• pad
• partition_limit
• partitions
• pass
• preprocessing
• quality
• segments
• show_compressed
• sns_strength
• target_PSNR
• target_size
• thread_level