操作系统_计算机颜色显示格式
作者：jason-wrj
分类：操作系统
标签：嵌入式操作系统，操作系统，Windows，linux，FPGA
更多：www.dioit.com——迪欧IT——嵌入式电子智能技术
一、显示位宽，色彩数
| 位宽深度_bit | 2^n | 色彩数 | 备注 |
|---|---|---|---|
| 1 | 2^1 | 2 (monochrome) | |
| 2 | 2^2 | 4 (CGA) | |
| 4 | 2^4 | 16 (EGA) | |
| 8 | 2^8 | 256 (VGA) | 嵌入式系统常用的颜色 |
| 16 | 2^16 | 65536 (High Color, XGA) | 嵌入式系统常用的颜色 |
| 24 | 2^24 | 16777216 (True Color, SVGA) | 计算机系统常用的颜色 |
| 32 | 2^24 2^8 |
16777216 (True Color) +256 (Alpha Channel) |
True Color真彩色 Alpha Channel控制透明度 |
二、不同显示位宽的转换
1、SVGA[23:0]：24bit-深度，RGB为R:8bit，G:8bit，B:8bit
R7,R6,R5,R4,R3,R2,R1,R0,G7,G6,G5,G4,G3,G2,G1,G0,B7,B6,B5,B4,B3,B2,B1,B0
2、XVGA[15:0]：16bit-深度，RGB为R:5bit，G:6bit，B:5bit
R4,R3,R2,R1,R0, G5,G4,G3,G2,G1,G0, B4,B3,B2,B1,B0
3、VGA[7:0]：8bit-深度，RGB为R:3bit，G:3bit，B:2bit
R2,R1,R0, G2,G1,G0, B1,B0
4、24bit转16bit转8bit，格式如下表，保留高位
| 24bit转16bit 16bit转8bit |
Red 红色-位宽 |
Green 绿色-位宽 |
Blue 蓝色-位宽 |
|---|---|---|---|
| 24bit | R[7:0] | G[7:0] | B[7:0] |
| 888格式 | 8 | 8 | 8 |
| 16bit | R[7:3] | G[7:2] | B[7:3] |
| 565格式，保留高位 | 5 | 6 | 5 |
| 8bit | R[7:5] | G[7:5] | B[7:6] |
| 332格式，保留高位 | 3 | 3 | 2 |
5、16bit转8bit，格式如下表，保留高位
| 16bit转8bit | R红色-位宽 | G绿色-位宽 | B蓝色-位宽 |
|---|---|---|---|
| 16bit | R[4:0] | G[5:0] | B[4:0] |
| 565格式 | 5 | 6 | 5 |
| 8bit | R[4:2] | G[4:2] | B[4:3] |
| 332格式，保留高位 | 3 | 3 | 2 |
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