Extra Half Brite (also referred to as Extra-Half-Brite, Extra-Halfbrite, or EHB),^[1][2][3][4] is aplanar display mode of theAmiga computer.

This mode uses sixbit planes (six bits per pixel).^[3][5][6] The first five bit planesindex 32 colors selected from a12-bit color space of 4096 possible colors. If the bit on the sixth bit plane is set, the display hardware halves thebrightness of the corresponding color component.^[7] This way 64 simultaneous colors are possible (32 arbitrary colors plus 32 half-bright components) while using only 32 color registers.^[8] The number of color registers is a hardware limitation of pre-AGA chipsets in Amiga computers.

Some contemporary games (Fusion,^[9]Defender of the Crown,^[10]Agony,^[11]Lotus II,^[12] orUnreal^[13]) and animations (HalfBrite Hill^[4]) use EHB mode as a hardware-assisted means to display shadows or silhouettes.^[9][14] EHB is often used as general-purpose 64 color mode with its own restrictions.^{[9][15][16][17]}

Some early versions of the first Amiga, theAmiga 1000, sold in theUnited States, lack the EHB video mode, which is present in all later Amiga models.^[4][2]

• Original Chip Set
• Hold-And-Modify

• Animated demo using Halfbrite mode (requiresJava)
• Amiga Graphics Archive - Extra Half-Brite

• Computer display standards
• Amiga
• Color depths

• Use mdy dates from August 2024