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Questions tagged [e-ink]

30 questions
7
votes
1 answer

E-ink PDF reader for developer?

Have anyone tried the E-ink PDF reader with technical documents? Since these devices, such as Kindle DX or SONY Reader, begin to support native PDF files, I am thinking of getting one just for reading technical documents. By technical document, I…
Gant
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6
votes
1 answer

Android: How to detect an e-ink screen?

I'd like to make my app more friendly for e-ink screens, i.e. reducing gradients, removing animations etc. Before I can add separate layouts for those screen types, I first need a way to detect them. Did somebody find a good way to do this? The…
Flo
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3
votes
2 answers

Problem converting an image for a 3-color e-ink display

I am trying to process an image file into something that can be displayed on a Black/White/Red e-ink display, but I am running into a problem with the output resolution. Based on the example code for the display, it expects two arrays of bytes (one…
Mike Buss
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2
votes
0 answers

'Pause' a 'while' loop in Bash

I've coded a Bash script for Kobo eReaders (https://github.com/tux-linux/Kobo-network-display-viewer) that displays a Linux-based computer screen on it. Here's a rough resume of how it works: 1. Gnome-screenshot takes real-time screenshots of the…
Nicolas Mailloux
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2
votes
1 answer

Android: How to control e-ink screen while off

My e-book reader (tolino shine 3) allows you to configure what the e-ink display should show when the screen is turned off. How can I do this programatically? I wrote a little app, that turns on wifi every 10 minutes to fetch and display the latest…
Clarenze
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2
votes
4 answers

Convert full color image to three color image for e-ink display

I'd like to be able to automagically convert full color images down to three color (black / red / white) for an e-ink display (Waveshare 7.5"). Right now I'm just letting the screen handle it, but as expected complex images get washed out. Are…
erik
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2
votes
1 answer

Forcing full e-ink refresh on android

I am developing comic reading application on Android devices. I've added many features to make it more user friendly for e-ink devices, but I still face one problem. Upon changing pages ghosting from previous pages can be seen. It is not a problem…
Areinu
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2
votes
1 answer

Do e-ink / e-paper screens work in the RGB, CMYK, or some other colour space?

Do e-ink / e-paper screens work in the RGB, CMYK, or some other colour space? Will we need to support native CMYK displays in the near future? I'm designing a data structure with colour information and want to know whether the colour part ought to…
Simon
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1
vote
1 answer

Waveshare e-ink display - content faded when boxes drawn below

I'm using a Waveshare e-ink display (5x7) attached to a Pi Zero W via a HAT. I'm building the content from top to bottom. As you can see from this photo (apologies for the reflection of the conservatory roof), all is fine up until this point…
Giles Bennett
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1
vote
1 answer

E-Ink Display shows weird behaviour with horizontal lines --> No contrast

My E-Ink display (Waveshare E-Ink, 7.5 inch, Version 1, 640×384) connected to Raspberry Pi Zero W via the e-paper HAT (https://www.waveshare.com/wiki/7.5inch_e-Paper_HAT) shows some content with horizontal lines very weak. Other content is displayed…
remi
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1
vote
0 answers

Waveshare e-Ink 2.9 and Heltec WIFI LoRa 32 V2

I’m trying to connect mit LoRa-ESP32 with an ePaper-Display from Waveshare. Therefore I’m using the GxEPD2 Library, but this does not work (with the library givven by waveshare the display works, but the usage is disgusting...). Know, I don’t know…
SUT
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1
vote
2 answers

Android: draw using fb0 on eink device

I've been looking a lot around, and can't find much of anything clear. The context is I have a stylus-enabled e-ink tablet that I program on for fun, and I'd love to use a native library to read the pen events, and draw directly on the framebuffer.…
Pierre
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1
vote
0 answers

Scaling TextView after wakeup

I created an app which shows a few text lines upon startup. It starts to scale this text up until it fills the screen (DisplayHeight) using setTextSize and a CustomLinearLayout overriding onSizeChanged. This is similar to some "Auto-fit TextView"…
kraftb
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0
votes
0 answers

Pico Pi / Inky - Update screen every hour using MicroPython

brand new to this stuff, this is my first ever touching of anything like this and struggling to know what the terms mean on blog posts and what to google, so thought would hopefully get a clean cut answer. I've got a Pi Pico W and Inky Frame running…
owenmelbz
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0
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0 answers

Is it possible to save a tkinter window widget as an image?

I am trying to use the python tkinter library to create an image from a window widget. I have seen several methods that allow you to use a canvas widget to save an image, but I don't want to use a canvas as I have already created the UI for the…
Ian
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