参数资料
| 型号： | AC164127-9 |
| 厂商： | Microchip Technology |
| 文件页数： | 2/34页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO GRAPH TRULY7 800X480 |
| 标准包装： | 1 |
| 系列： | PICtail™ Plus |
| 主要目的： | 显示器，LCD 显示器 |
| 已用 IC / 零件： | S1D13517 |
| 主要属性： | 7" WVGA TFT LCD |
| 次要属性： | 电阻式 4 线触控屏幕 |
| 已供物品： | 模块 |
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AN1368
In general, to divide 16 bits among Red, Green and
Blue, two schemes are used:
? Scheme 1 (R<5> G<6> B<5>): In this scheme,
there are 5 bits of Red, followed by 6 bits of Green
and 5 bits of Blue. Green is given more bits
because of the property of the human eye, which
can distinguish more shades of Green than Red
and Blue. Figure 2 illustrates these 64K colors.
? Scheme 2 (T<1> R<5> G<5> B<5>): In this
scheme, there is one transparent bit, followed by
5 bits each of Red, Green and Blue. The
transparent bit indicates if the color should be
used or not.
Currently, the Microchip Graphics Library (Version 2.11)
supports only Scheme 1.
FIGURE 3:
GRAYSCALE VALUES OF
0 TO 225
FIGURE 2:
COLORS IN 16-BIT
REPRESENTATION
Alternatively, color may be represented using a Color
Look-up Table (CLUT), also called a palette table, where
the color is specified by the index of the table, as shown
in Figure 4 . Depending on the size of the table, the bits
used to represent the index will vary as 256 entries of
RGB (8-bit index), 16 entries of RGB (4-bit index),
4 entries of RGB (2-bit index) and 2 entries of RGB (1-bit
index). This scheme is mainly used to save memory. For
FIGURE 4:
COLOR LOOK-UP TABLE
(CLUT)
Grayscale is usually represented in a byte, with 0 as
Black, 1-254 as the shades of Black, getting lighter as
the number increases, and 255 as White, as shown in
represent 16 or 4 shades of Black, respectively. If only
one bit is used to represent either the on or off of a
color, then it is called ‘Monochrome’.
The number of bits required to represent a color is
called the ‘Color Depth’. For example, a color depth of
16 bits means it requires 16 bits to represent a color,
and therefore, we can represent 2 16 different colors.
DS01368A-page 2
? 2011 Microchip Technology Inc.
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