Kindle boot-up screen modification?

[robertlz]

Hi,

I guess some of you already know bout the 'DUOKAN' system from China.

What I want to do is to change its boot-up screen. I already found the boot-up screen image file which is in raw dump format of framebuffer of kindle. There are total 600x800 4-bit HEX characters.

My question is how can I convert a picture of 600x800 to the format of raw data for framebuffer. I googled a lot and there is no direct answer. I am thinking writing a python script to do it, but to avoid unnecessary efforts, I am wondering if there is any tool which can do it.

Thanks a lot.

I attached the raw screen file.

[r0b1n]

I think you can try to find "raw" plugin/converter for GIMP or Photoshop. But still little chance of finding a suitable program for these purposes...

I quick wrote dirty Python scripts for convert BIN<->BMP (gray-scale 1byte per color).

Spoiler:

bmpToBin

#!/usr/bin/python

import Image

width = 600
height = 800

bin_file = "dkswitchmenu_new.bin"

bmp_file = "image.bmp"

# open bmp
im = Image.open(bmp_file)

# open bin 
f = open(bin_file, "wb")

for i in range(240000):
    
    c1 = im.getpixel((i*2%width,i*2/width))
    c2 = im.getpixel(((i*2+1)%width,(i*2+1)/width))
    
    # to 1 byte
    r = (c2 >> 4) | c1
    
    #second - i*2+1
    f.write(chr(r))

f.close()

binToBmp

#!/usr/bin/python

import Image

width = 600
height = 800

bin_file = "dkswitchmenu.bin"
bmp_file = "image.bmp"

im = Image.new("L", (width,height))

f = open(bin_file, "rb")

for i in range(240000):
    # read from file and put into image
    
    # read 1 byte
    r = ord(f.read(1))
    c1 = (r & 0xF0) >> 4
    c2 = (r & 0x0F)
    
    # first - i*2
    im.putpixel((i*2%width,i*2/width),c1 << 4)
    
    #second - i*2+1
    
    im.putpixel((  (i*2+1)%width,(i*2+1)/width),c2 << 4)
im.save(bmp_file)
f.close()

[robertlz]

Hi, r0b1n,

Many many thanks for your help and your time.

[meem]

Where we may put image file to replace the original ?

[Rinzwind]

Originally Posted by meem

Where we may put image file to replace the original ?

I really do not know. but as an alternative... Why not post the image on the duokan.com forums and ask them to use this when someone wants the english version of the duokan fw?

[512]

hi, I've done this "beta" version of the splashscreen, feel free to try it. My kindle will arrive tomorrow, so I can't test it now.
Thanks to r0b1n for his scripts!

[FethryDuck]

Originally Posted by 512

hi, I've done this "beta" version of the splashscreen, feel free to try it. My kindle will arrive tomorrow, so I can't test it now.
Thanks to r0b1n for his scripts!

Have tested it - so it works. Had started with something, but needed some translation help, as there are several others. Google translate is not so good with images well, we will get there.

[512]

ok,thank you! I'll test it as I can install duokan's...I've some problems with the installation, the splashscreen doesn't appear...I'll try to reset my kindle and then install the duokan's

If you have suggestion for improving my horrible splashscreen version (fonts, graphics and so on) please let me know!

[abkindlen]

All of this, somekinda exceeded my scripting skills.
I had serious trouble installing the PIL module to my OSX 1.6.7 Python
Here's a easy Workaround:

The Screenshot Shortcut (Alt + Shift + G) works as soon as the bootloading bar disapears. So it did on my Kindle 3(.2) Wifi US.
So i just took a screenshot. It does not contain the Bootloaderbar!

Spoiler: