How can I get the color of a screen pixel THROUGH ADB

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I need to get the color information of a specific point on screen of my android phone.

Is there a way to do that through ADB?

I am now using the build-in command screencap to capture the whole screen and then read the color of the specific point. However, it is too slow.

I will post an answer to my own question. The answer maybe device-specified (nexus7 2013), and you can adjust it to your own devices.

1.Firstly, I find out that the command screencap screen.png is quite slow because it take most of its time converting to png file type. So, to save time, the first step is dump screen to a raw data file. adb shell screencap screen.dump

2.Check the file size. My screen resolution is 1920*1200, and the file size is 9216012 byte. Noticing that 9216012=1920*1200*4+12, I guess the data file use 4 byte to store every pixel information, and use another 12 byte to do some mystery staff. Just do some more screencaps and I find the 12 byte at the head of each file are the same. So, the additional 12 byte is at the head of the data file.

3.Now, things are simple by using dd and hd. Assuming that I want to get the color at (x,y): let offset=1200*$y+$x+3 dd if='screen.dump' bs=4 count=1 skip=$offset 2>/dev/null | hd

I get output like 00000000: 4b 73 61 ff s 21e sum 21e The 4b 73 61 ff is my answer.

How can I get the color of a screen pixel THROUGH ADB, I need to get the color information of a specific point on screen of my android phone. Is there a way to do that through ADB? I am now using the build-in� Finally, you’ll need to enter a single command to get the built-in screen recorder working. After you’ve entered the command, the feature will be live on your device. adb shell settings put

If your phone is rooted and you know its framebuffer format you could use dd and hd (hexdump) to get the pixel representation directly from the framebuffer file:

adb shell "dd if=/dev/graphics/fb0 bs=<bytes per pixel> count=1 skip=<pixel offset> 2>/dev/null | hd"

Usually <bytes per pixel> = 4 and <pixel offset> = Y * width + X but it could be different on your phone.

How can I get the color of a screen pixel THROUGH ADB, I need to get the color information of a specific point on screen of my android phone. Is there a way to do that through ADB? I am now using the build-in� Google eventually added display color options, and for the most part, the complaints stopped. With the Pixel 3 and Pixel 3 XL, the displays are nearly perfect. However, you can still adjust the

Based on previous accepted answer, i wrote a SH function able to calculate buffer and etc to work out of the box on my phone.

usage:

GetColorAtPixel X Y

GIST : https://gist.github.com/ThomazPom/d5a6d74acdec5889fabcb0effe67a160

widthheight=$(wm size | sed "s/.* //")
width=$(($(echo $widthheight | sed "s/x.*//g" )+0))
height=$(($(echo $widthheight | sed "s/.*x//g" )+0))
GetColorAtPixel () {
    x=$1;y=$2;
    rm ./screen.dump 2> /dev/null
    screencap screen.dump
    screenshot_size=$(($(wc -c < ./screen.dump)+0));
    buffer_size=$(($screenshot_size/($width*height)))
    let offset=$width*$y+$x+3
    color=$(dd if="screen.dump" bs=$buffer_size count=1 skip=$offset 2>/dev/null | hd | grep -Eo "([0-9A-F]{2} )" |sed "s/[^0-9A-F]*\$//g" | sed ':a;N;$!ba;s/\n//g' |cut -c3-8)
    echo $color;
}

And an alternative version, (the first one does not work for me when i embed it in an sh file for some unkown default hexdump behaviour issue)

widthheight=$(wm size | sed "s/.* //")
width=$(($(echo $widthheight | sed "s/x.*//g" )+0))
height=$(($(echo $widthheight | sed "s/.*x//g" )+0))
GetColorAtPixel () {
        x=$1;y=$2;
        rm ./screen.dump 2> /dev/null
        screencap screen.dump
        screenshot_size=$(($(wc -c < ./screen.dump)+0));
        buffer_size=$(($screenshot_size/($width*height)))
        let offset=$width*$y+$x+3

        color=$(dd if="screen.dump" bs=$buffer_size count=1 skip=$offset 2>/dev/null | /system/xbin/hd | awk '{ print toupper($0) }' | grep -Eo "([0-9A-F]{2})+" | sed ':a;N;$!ba;s/\n//g' | cut -c9-14 )
        echo $color;
}

Get pixel color, How can I get a pixel color on screen using adb? I wish to get it directly not through screen capture, thanks! Sign in to reply. 7/20/16 FeoniX4YoonA. I have tried� Automatically adjust your screen's color temperature to the light around you. Smooth Display (Pixel 4 only) Improve scrolling and animations across most apps. Screen saver Set a screen saver to show photos, colorful backgrounds, and more while your phone is charging. Learn how to u se screen savers. Lock screen display. Lock screen: Choose how

ADB Debug - Possible to determine the color of the screen?, Bitmaps stored by adb screencap are normal rgb bitmaps. You can literally calculate the offset of a given pixel within the file using a simple formula, and read the 3 byte rgb value directly. Or you could just use an adaptation of the Palette library used to determine the main colour(s) of an image. adb get-serialno. Displays the adb instance serial number string with the device. adb get-state. Shows the status of the device. adb wait-for-device. This command is used to program delay before the next command is issued. It executes when the device is online but it can be programmed to wait till another process is done. adb start-server

Pixel Perfect!, Start Pixel Perfect; Get familiar with the tools; Add an overlay image Pixel Perfect is a tool built into Android Device Monitor that displays a magnified Android Studio might show a Disable adb integration dialog because only Its color information and X/Y coordinates appear at the bottom of the pane. Sorry to tell you screencap just a simple command, only accept few arguments, but none of them can save time for you, here is the -h help output. $ adb shell screencap -h usage: screencap [-hp] [-d display-id] [FILENAME] -h: this message -p: save the file as a png. -d: specify the display id to capture, default 0.

How to enable Android's built-in screen recorder on Google Pixel, Google Pixel smartphones have a little-known screen recorder baked Next, you'll need to have a computer nearby with support for ADB commands. Blur, more � What color do you want Google to use on the next Pixel? Ok so I'm trying to get a little more advanced here and one of the things i want to learn how to do is get pixel color or data from a certain position on the screen. I have searched a lot but it seems most people want to do this in c or c++. Im making a program that scans a location on the screen for a certain color.

Comments
  • Nice solution, but why i can't perform the command when i add "| hd" to the end on the phone, but i can perform it when executing from adb.exe console? What does "| hd" do?
  • hd or hexdump is used to display the binary data. For example, you has "123" in a text file, and hd THE-FILE gets 31 32 33. What's your command?
  • hi, I don't understand the coordinate well, why $y is multiply by 1200 but not 1920?
  • What does 4b 73 61 ff translate too? RGB colors? Why 4 bytes?
  • Replying to myself. It's Red, Green, Blue, Alpha, in this order.
  • I type adb shell "dd if=/dev/graphics/fb0 bs=4 count=1 skip=1000 2>/dev/null | hd", It returns Usage: hd [-b base] [-c count] [-r delay] file. Seems that the 'hd' is executed in my bash shell rather than the adb shell. I try the following: I So
  • most likely you don't have root so dd does not produce any output for hd to process
  • I try the following: adb shell su dd if=/dev/graphics/fb0 bs=4 count=1 skip=1000 2>/dev/null | hd It returns something like 00000000: 00 00 00 00 s 0 sum 0
  • Those 4 bytes 00 00 00 00 is the data you are looking for.
  • i got C6 7A 25 62 , how to change the value to RGB?