Kindle Touch-open specific image by command line

[thaonphuong]

Hello,
I intend to control opening images stored on kindle touch (images folder) by one script.

With that need, i try to understand Kindle command to open specific images instead of manual action (tap on images). I see that running usr/bin/imageviewer.sh behaves like opening Images folder, then i have to tap on image to open it

Do you have any advice to do this or any similar packages to perform to open specific images? Appreciate for your help


P/S: i see kindle always returns following event when i touch/tap on images after running command udevadm monitor --property. Honestly, i do not understand and if we can utilize these information in making script to open specific image?

KERNEL[1451380348.330980] change   /devices/platform/zforce.0/input/input4 (input)
UDEV_LOG=3
ACTION=change
DEVPATH=/devices/platform/zforce.0/input/input4
SUBSYSTEM=input
ZForce=touch
PRODUCT=0/0/0/0
NAME="zforce"
PHYS="zforce/input0"
EV==b
KEY==6420 0 0 0 0 0 0 0 0 0 3
ABS==2608000 3
MODALIAS=input:b0000v0000p0000e0000-e0,1,3,k145,14A,14D,14E,ra0,1,2F,35,36,39,mlsfw
SEQNUM=1970

UDEV  [1451380348.332288] change   /devices/platform/zforce.0/input/input4 (input)
UDEV_LOG=3
ACTION=change
DEVPATH=/devices/platform/zforce.0/input/input4
SUBSYSTEM=input
ZForce=touch
PRODUCT=0/0/0/0
NAME="zforce"
PHYS="zforce/input0"
EV==b
KEY==6420 0 0 0 0 0 0 0 0 0 3
ABS==2608000 3
MODALIAS=input:b0000v0000p0000e0000-e0,1,3,k145,14A,14D,14E,ra0,1,2F,35,36,39,mlsfw
SEQNUM=1970

KERNEL[1451380348.432021] change   /devices/platform/zforce.0/input/input4 (input)
UDEV_LOG=3
ACTION=change
DEVPATH=/devices/platform/zforce.0/input/input4
SUBSYSTEM=input
ZForce=notouch
PRODUCT=0/0/0/0
NAME="zforce"
PHYS="zforce/input0"
EV==b
KEY==6420 0 0 0 0 0 0 0 0 0 3
ABS==2608000 3
MODALIAS=input:b0000v0000p0000e0000-e0,1,3,k145,14A,14D,14E,ra0,1,2F,35,36,39,mlsfw
SEQNUM=1971

UDEV  [1451380348.432332] change   /devices/platform/zforce.0/input/input4 (input)
UDEV_LOG=3
ACTION=change
DEVPATH=/devices/platform/zforce.0/input/input4
SUBSYSTEM=input
ZForce=notouch
PRODUCT=0/0/0/0
NAME="zforce"
PHYS="zforce/input0"
EV==b
KEY==6420 0 0 0 0 0 0 0 0 0 3
ABS==2608000 3
MODALIAS=input:b0000v0000p0000e0000-e0,1,3,k145,14A,14D,14E,ra0,1,2F,35,36,39,mlsfw
SEQNUM=1971

[thaonphuong]

Finally, i see command eips can serve for my purpose

To load one image (600x800), i use
eips -g /path/to/image/file

To clear screen, use eips -c

Before that, i use lipc-set-prop com.lab126.powerd preventScreenSaver 1 to disable screen saver

This works on my kindle touch firmware 5.3.7.3

[eschwartz]

I think that is it.

I have seen other hacks that print images using eips, but I haven't seen anyone using the Kindle's native ImageViewer that way.

FWIW, use eips -f -g (for full update)
And you can save and restore whatever used to be on the screen by cat'ing to/from /dev/fb0 <--> temporary file.

[NiLuJe]

For a real-world example of what @eschwartz just described, see the "Preview Current Screensaver" code in the ScreenSavers Hack's KUAL extension .

[thaonphuong]

Thanks eschwartz, combine option -f in when clear screen resolves my current issue. eips -f -c this reduce pattern/outline of previous image after being cleared

One thing i still have not finalize is the image format/property put on kindle screen. Is it 600 width * 800 height, grayscale ? I tried new image created from GIMP with mentioned info (600*800, grayscale) but it does not display at correct position (center) as i supposed. Any other image format i miss here?

An image- got from other kindle project (https://github.com/mpetroff/kindle-w...master/kindle/), which is displayed very fit on kindle.


Thanks

[eschwartz]

600x800 images *should* display covering the entire screen perfectly.
It will expect a PNG.


What image are you using (upload it please, our "Go Advanced" reply mode comes with a free attachments feature) and what unexpected results are you getting?

[NiLuJe]

eips is *very* finicky. It expects a PNG8 with a 256c palette. Be careful when dithering down to 16c, since that (logically) tends to produce a 16c palette, which eips doesn't handle.

I usually use ImageMagick to handle that, the full commandline has been posted a few times around here (besides being in the ScreenSavers Hack) .

[thaonphuong]

Yes, my image is *.png. I attach my image here for reference

@NiLuJe, could you help forward the link, i search some but could not find. Sorry for this

Is below command correct convert filename.png -depth 8 converted_file.png?

[thaonphuong]

Oops, include attachment

[knc1]

File is not 600 w x 800 h
it is indexed two color

[NiLuJe]

@thaonphuong: latest occurence. The palette also ships w/ the ScreenSavers hack.

Tweak the screen size as needed, of course (careful, it's specified two times, one for the image, and one for the letterboxing).

[thaonphuong]

it displays very well on my kindle touch
convert in_filename.png -filter LanczosSharp -resize 300x400 -background white -gravity center -extent 600x800 -colorspace Gray -dither FloydSteinberg -quality 75 -define png:color-type=0 -define png:bit-depth=8 out_filename.png

Next step i will perform above command in batch, yeah. Many thanks NiLuJe for your help