format of the bitmap .c file

Using Arduino Programming Questions
1

Hello everybody,

In a .c file created with "ImageConverter 565" that represent a bitmap, I like to know what represent each word. For instance, in this file, are each word a color value, an address, a mix ?

// Generated by  : ImageConverter 565 v1.2
// Generated from: yyy.gif
// Time generated: 27/08/2013 20:13:05
// Dimensions    : 4x12 pixels
// Size          : 96 Bytes

#include <avr/pgmspace.h>

prog_uint16_t yyy[0x30] PROGMEM ={
0xB5B5, 0xDED5, 0xFFFF, 0xFFFF, 0xFFFF, 0x0000, 0xFFFF, 0xFFFF, 0xFFFF, 0x6B6A, 0xFFFF, 0xFFFF, 0xFFFF, 0xB5B5, 0xFFFF, 0xFFFF,   // 0x0010 (16)
0xFFFF, 0xDEDF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0x9495, 0xFFFF, 0xFFFF, 0xFFFF, 0x6B6A, 0xFFFF, 0xFFFF, 0xFFFF, 0x2120, 0xFFFF,   // 0x0020 (32)
0xFFFF, 0xFFFF, 0x212A, 0xFFFF, 0xFFFF, 0xFFFF, 0x4A4A, 0xFFFF, 0xFFFF, 0xFFFF, 0x9495, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0x4A4A,   // 0x0030 (48)
};

Thanks for your help.

Pierre

2

GIF's are not "bitmaps" from the size it looks like a simple dump of the if, in which case you need to look up the gif documentation to understand the data.

Mark

3

Here is the file got from the corresponding bmp file :

// Generated by  : ImageConverter 565 v1.2
// Generated from: yyy.bmp
// Time generated: 27/08/2013 20:49:50
// Dimensions    : 4x12 pixels
// Size          : 96 Bytes

#include <avr/pgmspace.h>

prog_uint16_t yyy[0x30] PROGMEM ={
0xB5B5, 0xDED5, 0xFFFF, 0xFFFF, 0xFFFF, 0x0000, 0xFFFF, 0xFFFF, 0xFFFF, 0x6B6A, 0xFFFF, 0xFFFF, 0xFFFF, 0xB5B5, 0xFFFF, 0xFFFF,   // 0x0010 (16)
0xFFFF, 0xDEDF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0x9495, 0xFFFF, 0xFFFF, 0xFFFF, 0x6B6A, 0xFFFF, 0xFFFF, 0xFFFF, 0x2120, 0xFFFF,   // 0x0020 (32)
0xFFFF, 0xFFFF, 0x212A, 0xFFFF, 0xFFFF, 0xFFFF, 0x4A4A, 0xFFFF, 0xFFFF, 0xFFFF, 0x9495, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0x4A4A,   // 0x0030 (48)
};

Is is exactly the same. So I dont think that the original format as any exffect on the .c file.

Pierre

4

It looks to me to be raw image data.

The image, as the comments show, is 4x12 pixels. 4x12 = 48.

The data is 96 bytes. 96 / 48 = 2. So two bytes per pixel. Given the name of the program, that's what I'd expect.

565 is a 16-bit RGB colour space definition - 5 bits of red, 6 of green (the eye is more sensitive to green) and 5 of blue: RRRRRGGG GGGBBBBB

So each word is a single pixel in 565 RGB format, probably in a left-to-right, top-to-bottom arrangement.

5

From (what I think) is the right webpage.

http://www.henningkarlsen.com/electronics/t_imageconverter565.php

This tool can be used to convert images into the formats required for my UTFT libraries for

So it could be any thing - but majenko may well be right.

Mark

6

You can try do a simple test. Pass to this tool a picture with RED, GREEN and BLUE squares in a simple size and just see the output.

Bye

7

If I am right, the image you have there should look like this: but I'm not sure that's right. Maybe if you did a larger image I could test it better.

8

The UTFT lib may allow "a transparent" pixel, not just colors.

Mark

9

majenko:
It looks to me to be raw image data.

The image, as the comments show, is 4x12 pixels. 4x12 = 48.

The data is 96 bytes. 96 / 48 = 2. So two bytes per pixel. Given the name of the program, that's what I'd expect.

565 is a 16-bit RGB colour space definition - 5 bits of red, 6 of green (the eye is more sensitive to green) and 5 of blue: RRRRRGGG GGGBBBBB

So each word is a single pixel in 565 RGB format, probably in a left-to-right, top-to-bottom arrangement.

You couldn't be more correct :slight_smile:

Each word is a RGB565 encoded value for a pixel starting from the upper left corner, going alone each line to end up in the lower right corner.

UTFT does not support transparency.

/Henning