Take screenshot from Kobo

[koenieee]

Thanks to this link: http://www.cnx-software.com/2010/07/...er-screenshot/
we can make screenshot from our Kobo screen.

* requires telnet

run this command:

cat /dev/fb0 > screen.raw

get the screen.raw via ftp to you local computer that's running PERL.

Create a new perl script with this contents:

#!/usr/bin/perl -w

$w = shift || 240;
$h = shift || 320;
$pixels = $w * $h;

open OUT, "|pnmtopng" or die "Can't pipe pnmtopng: $!\n";

printf OUT "P6%d %d\n255\n", $w, $h;

while ((read STDIN, $raw, 2) and $pixels--) {
   $short = unpack('S', $raw);
   print OUT pack("C3",
      ($short & 0xf800) >> 8,
      ($short & 0x7e0) >> 3,
      ($short & 0x1f) << 3);
}

close OUT;

Chmod +x FILE.sh

after that run this:
change the resolution to your Kobo screen (I have a kobo Glo)

./FILE.SH 1024 758 < screen.raw > screen.png

And there you go, screen.png contains you Kobo Sreenshot.

[RoninTech]

Good one!

[stewacide]

Someone with telnet set up, you could use this technique to determine the Kobo Glo's maximum native image size and forward this information onto the Calibre developers in order to create an optomized Kobo Glo output profile.

[ichrispa]

I'm triggering the following script via an integrated webserver on the kobo touch... screenshots directly to the desktop ^^

#!/mnt/onboard/.local/bin/python

import png
import struct

RAWD = "/mnt/onboard/.local/tmp/screenshot.raw"

# create a raw image
fb = open("/dev/fb0", b"r")
rawf = open(RAWD, b"w")
rawf.write(fb.read(1089536))
rawf.close()

rawf = open(RAWD, b"r")
pngf = open("/mnt/onboard/.local/tmp/screenshot.png", "w")

rawpng_flat = []
rawpng = []
pixel = []

data = rawf.read(2)
print "Screen data aquired"

while data != "":
r5 = (struct.unpack("H", data)[0] >> 11) & 0x1F
g6 = (struct.unpack("H", data)[0] >> 5) & 0x3F
b5 = (struct.unpack("H", data)[0]) & 0x1F
r8 = (r5<<3)+(r5>>2)
g8 = (g6<<2)+(g6>>4)
b8 = (b5<<3)+(b5>>2)

rawpng_flat += [r8%256, g8%256, b8%256]
data = rawf.read(2)

print "Writing Screenshot"
png.Writer(width=800,height=600,bitdepth=8).write_ array(pngf, rawpng_flat)

pngf.close()
rawf.close()