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Topic: TVout (Read 830 times) previous topic - next topic

baum

Continuing my posts about the TVout library:

Check out the wiki for creating bitmaps.
http://code.google.com/p/arduino-tvout/wiki/Bitmaps

Here's the TVout Logo:
Code: [Select]
#include "TVOlogo.h"
PROGMEM const unsigned char TVOlogo[] = {
96,32,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x3F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFC,0x00,
0x03,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0xC0,
0x1C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x40,0x10,0x38,
0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x04,
0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x40,0x02,
0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0A,0x80,0x02,
0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0x00,0x02,
0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0xFF,0xFF,0xC2,
0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00,0x42,
0x4F,0xFF,0x60,0x18,0x00,0x00,0x00,0x00,0x17,0xFF,0xFF,0x42,
0x4F,0xFF,0x60,0x18,0x00,0x00,0x00,0x30,0x14,0x00,0x01,0x42,
0x40,0x60,0x60,0x18,0x00,0x00,0x00,0x30,0x14,0x70,0x71,0x42,
0x40,0x60,0x30,0x30,0x00,0x00,0x00,0x30,0x14,0x88,0x89,0x42,
0x40,0x60,0x30,0x30,0x3E,0x06,0x0C,0xFE,0x15,0x05,0x25,0x42,
0x40,0x60,0x30,0x60,0xFF,0x86,0x0C,0xFE,0x15,0x72,0x75,0x42,
0x40,0x60,0x18,0x60,0xC1,0x86,0x0C,0x30,0x15,0x05,0x25,0x42,
0x40,0x60,0x18,0x61,0x80,0xC6,0x0C,0x30,0x14,0x88,0x89,0x42,
0x40,0x60,0x18,0xC1,0x80,0xC6,0x0C,0x30,0x14,0x70,0x71,0x42,
0x40,0x60,0x0C,0xC1,0x80,0xC6,0x0C,0x30,0x14,0x00,0x01,0x42,
0x40,0x60,0x0C,0xC1,0x80,0xC6,0x0C,0x30,0x17,0xFF,0xFF,0x42,
0x40,0x60,0x0F,0x81,0x80,0xC6,0x0C,0x30,0x10,0x00,0x00,0x42,
0x40,0x60,0x07,0x80,0xC1,0x87,0x1C,0x30,0x15,0x40,0x15,0x42,
0x40,0x60,0x07,0x80,0xFF,0x83,0xFC,0x3E,0x12,0x8A,0x8A,0x42,
0x40,0x60,0x03,0x00,0x3E,0x01,0xEC,0x1E,0x15,0x40,0x15,0x42,
0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00,0x42,
0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0xFF,0xFF,0xC2,
0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x04,
0x1C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x38,
0x03,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0xC0,
0x00,0x3F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFC,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
};



Now since the TVout library only supports black and white, I should only see white (0xFF) and black (0x00). So why do I see all these other colors, like dark blue (0x42)?

Thanks for any help!

mdmetzle

TVout uses a 1bit encoding.  So each byte contains 8 pixels worth of data.
ie 0x00 = 8 black pixels and 0xff = 8 white pixels.

baum

And how is that encoded?
Is it

bit (1, 2, 3, 4, 5, 6, 7, 8}

or

bit (1, 2, 3,
      4, 5, 6
      7, 8, 9)
?

mdmetzle

lets say we have a 16pixel line: pixel 0,1,2..15
it would be encoded like so:

byte1{0,1,2,3,4,5,6,7} byte2{8,9,10,11,12,13,14,15}

Each line must be a multiple of 8 pixels.

baum


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