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Vancouver Design Center

 

 

3.4 Eight Bit-Per-Pixel (256 Colors)

In eight bit-per-pixel mode one byte of display buffer represents one pixel on the display. At this color depth the read-modify-write cycles, required by the lessor pixel depths, are eliminated.

When using a color panel, each byte of display memory acts as and index to one element of the LUT. The displayed color is arrived at by taking the display memory value as an index into the LUT.

Eight bit per pixel is not supported for monochrome display modes. The reason is that each element of the LUT supports a 4-bit (sixteen value) level for red, green and blue. In monochrome display modes on the green value is used to set the gray intensity. Thus we have sixteen possible grey values but, because of the color

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Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

 

 

 

 

 

 

 

 

Red bit 2

Red bit 1

Red bit 0

Green bit 2

Green bit 1

Green bit 0

Blue bit 1

Blue bit 0

 

 

 

 

 

 

 

 

Figure 3-4: Pixel Storage for 8 Bpp (256 Colors) in One Byte of Display Buffer

S1D13705

Programming Notes and Examples

X27A-G-002-03

Issue Date: 02/01/22

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Epson S1D13705 technical manual Eight Bit-Per-Pixel 256 Colors, Green bit