PixelGetColor isn't working on a specific computer

[endtro]

Hello, there!

For whatever reason PixelGetColor isn't working properly on my new Laptop. I did found out what's wrong, but don't understand why it's happening. So, it seems that AutoIt is analyzing the screen as if it's upscaled and/or has a weird offset.

Here's a script that I used for testing purposes:

F8 saves the mouse position, F9 saves the color of a pixel where F8 was pressed. After that I just wave the cursor around the screen, and if the color under the cursor matches the saved one, it plays the sound.

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#include <MsgBoxConstants.au3>

HotKeySet("{F8}", "GetPosition")
HotKeySet("{F9}", "GetColor")

Global $gPos0, $gPos1, $gColor

While True
   Local $pos = MouseGetPos()
   If Hex(PixelGetColor($pos[0], $pos[1])) == $gColor Then
      SoundPlay ("C:\Windows\Media\Speech Misrecognition.wav")
   EndIf
Sleep(500)
WEnd

Func GetPosition()
   $mPos = MouseGetPos()
   $gPos0 = $mPos[0]
   $gPos1 = $mPos[1]
   MsgBox(0, "", $gPos0 & ", " & $gPos1)
EndFunc

Func GetColor()
   $gColor = Hex(PixelGetColor($gPos0, $gPos1))
   MsgBox(0, "", $gColor)
EndFunc

 

Also, here's the kind of paint images I used for testing. It turned out that PixelGetColor detects the green color in the area marked by the orange rectangle, not where it actually is.

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I'd really appreciate if anyone helps me with this nonsense. Thanks!

[Melba23]

endtro,

Welcome to the AutoIt forums.

This is no doubt a matter of a different display scaling on the affected computer. There are plenty of threads about this on the forum if you search.

M23

[endtro]

  On 3/31/2021 at 8:08 PM, Melba23 said:

This is no doubt a matter of a different display scaling on the affected computer. There are plenty of threads about this on the forum if you search.

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Hey, thanks for a quick reply!

So I did looks around the forum and the most I could get is to multiply my PixelGetColor coordinates by the scale factor. I did a bit of testing and unfortunately it doesn't seem like it's gonna work pixel perfect which is an issue for me.

 

#include <WinAPIGdi.au3>

Global $scale = _WinAPI_EnumDisplaySettings('', $ENUM_CURRENT_SETTINGS)[0] / @DesktopWidth

ConsoleWrite("Scale = " & _WinAPI_EnumDisplaySettings('', $ENUM_CURRENT_SETTINGS)[0] & " / " & @DesktopWidth & " = " & $scale & @CRLF)

Found this bit of code above by Malkey and tried to use it like this:

PixelGetColor($pos[0] * $scale, $pos[1] * $scale)

It does work for the most part, but not accurate enough. I tried to round the coordinates up and down as well but to no avail.

 

Any other advises?

I don't mean no disrespect, but do you know if AutoHotKey have this kind of an issue?

 

[Jos]

  On 3/31/2021 at 9:17 PM, endtro said:

but do you know if AutoHotKey have this kind of an issue?

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Understand you don't mean to disrespect ...but this is not the smartest question in these forums and would advice you to go there.  

[rednaxela]

I had the same inssue and i decided make pixelsearch very small areas searching the same colors. That solved the problem of multiple computers.

[endtro]

  On 4/1/2021 at 3:01 AM, rednaxela said:

I had the same inssue and i decided make pixelsearch very small areas searching the same colors. That solved the problem of multiple computers.

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That's actually a great idea! I've only noticed it occasionally skipping horizontal lines of pixels. I'm gonna have to check if it also skips vertical lines. Maybe I'll be able to get away with scanning 1x3 areas around the mouse cursor.

Thanks!

[NIKHILSKYNET]

DllCall("User32.dll", "bool", "SetProcessDPIAware")

 

This fixed the Problem For me when Display scaling is not 100%