From: Heesob Park <phasis@...>
Date: 2009-01-29T13:33:54+09:00
Subject: Re: Converting binary image file to bmp file using RMagick2.0

2009/1/29 Kamaljeet Saini <kamaljeet_singh_saini@hotmail.com>:
> thanks for the reply.
>
> Whats this terms means:
> 1) "0xF800" or "0x7E0" so on... anything specific to anything.
0xF800 is hexadecimal number ant equal to 63488 and 0b1111100000000000
in binary.
0x7E0 is 0b11111100000

RRRRRGGGGGGBBBBB & 0xF800 =
RRRRRGGGGGGBBBBB & 0b1111100000000000 =
RRRRR00000000000

RRRRRGGGGGGBBBBB & 0x7E0 =
RRRRRGGGGGGBBBBB & 0b1111100000000000  =
00000GGGGGG00000

> and
> 2) what this means "<<" or ">>"
>
<< is binary left shift operator. The left operands value is moved
left by the number of bits specified by the right operand.
>> is binary right shift operator. The left operands value is moved right by the number of bits specified by the right operand.
RRRRR00000000000 >> 11 =
RRRRR

00000GGGGGG00000 >> 5 =
GGGGGG

RRRRR << 3 =
RRRRR000

GGGGGG << 2 =
GGGGGG00

Regards,

Park Heesob