Colors not matching: au3info vs. pixelgetcolor()

[cag8f]

I'm using the Autoit Windows Information Tool to determine the pixel coordinate ($X, $Y) and color hex value (lime green, 0x00FF00). But when I then run a simple Autoit script to confirm this:

hex(PixelGetColor($X, $Y)

I am met with a different color hex value (0000DD00).  Shouldn't the 2 hex values match?  If so, am I doing something wrong?

I found this old post describing a similar issue.  

'?do=embed' frameborder='0' data-embedContent>>

I tried to follow the recommendations but encountered a problem.  I made sure that the Coord Mode in AutoItInfo was set to 'screen,' but I couldn't find where to set Opt("PixelCoordMode", ?). It doesn't appear to be in the User Options or Global Options files.

Thanks in advance.

[JLogan3o13]

Just out of curiosity, what is the end result once you get the hex value (e.g. what are you trying to manipulate)? There is likely (almost always) and easier way to accomplish what you're after than having to resort to matchin pixel colors.

[cag8f]

The colors, and use of Autoit to determine those colors, are the end result.  I'm teaching an introductory programming class to high school students and wanted to do this as a lesson.  But this is behavior I can't explain, so I'd like to understand what is happening before the lesson.

[JohnOne]

Is Window info tool in absolute or window or client mode?

[cag8f]

I tried all 3 and get the same results with each.

[JohnOne]

Does this give you all the same colour?

$y = 0

For $x = 0 To @DesktopWidth Step 10
    ConsoleWrite("0x" & Hex(PixelGetColor($x, $y), 6) & @LF)
    $y += 8
Next

[cag8f]

No it does not.

edit:  should it have?

Edited August 11, 2014 by cag8f

[JohnOne]

It's possible but doubtful.

My guess is there is more to your code and it's calculation of x and y, and that is where your problem lies.

Or perhaps you have some weird DPI setting.

[Malkey]

...

I found this old post describing a similar issue.  

 

'?do=embed' frameborder='0' data-embedContent>>

 

I tried to follow the recommendations but encountered a problem.  I made sure that the Coord Mode in AutoItInfo was set to 'screen,' but I couldn't find where to set Opt("PixelCoordMode", ?). It doesn't appear to be in the User Options or Global Options files.

 

Thanks in advance.

To be put near the top of your script, below any include files.

Opt("PixelCoordMode", 1) ;1=absolute, 0=relative, 2=client

[cag8f]

@Malkey, thank you.  I added that code though, but with the same results.  

@JohnOne.  Thanks for your help.

>> My guess is there is more to your code and it's calculation of x and y, and that is where your problem lies.

For testing purposes, I've reduced my code down to one line:

ConsoleWrite(hex(PixelGetColor($X,$Y), 6) & @CR)

Anyone else have any ideas why this is happening?

[BrewManNH]

I can't duplicate your issue, I tested with a pixel on the desktop background, and one inside the browser window. PixelGetColor was returning the same value as the info tool.

[cag8f]

OK thanks for that info.  The difference in colors is very small:  00FF00, 00DD00.  So perhaps:

1. AU3info does uses a slightly different algorithm than pixelgetcolor() when calculating colors.  Highly unlikely, and maybe not even possible.

or 

2.  Since the colors are shades of themselves (lime green), they could be neighboring pixels.  So perhaps the coordinate systems between my AU3info and pixelgetcolor() are slightly off.  I will try to troubleshoot that more, perhaps by checking the coordinates/colors of the corner pixels.  I'll post back here if anyone's interested.  

[Malkey]

Using this example,  I get the same mouse position and color on the tool tip as is on AU3info.

HotKeySet("{ESC}", "Terminate")
Local $aMPos

While 1
    $aMPos = MouseGetPos()
    ToolTip($aMPos[0] & ", " & $aMPos[1] & @LF & "0x" & Hex(PixelGetColor($aMPos[0], $aMPos[1]), 6))
    Sleep(10)
WEnd


Func Terminate()
    Exit 0
EndFunc   ;==>Terminate

Edit:Added Sleep.

Note: When the screen changes color without the mouse moving, I found the tool tip changes but the Au3Info color does not change until the mouse is moved.

Edited August 12, 2014 by Malkey

[cag8f]

OK resolved for now.  User error I guess.  I had set 

Opt("PixelCoordMode", 0)

Instead of 

Opt("PixelCoordMode", 1)

Making that change gives me consistent colors.  Thanks for everyone's help!

[JohnOne]

It is still strange, by default PixelCoordMode has always been 1 for me.

[Nitrolord]

On 8/11/2014 at 11:54 AM, cag8f said:

I'm using the Autoit Windows Information Tool to determine the pixel coordinate ($X, $Y) and color hex value (lime green, 0x00FF00). But when I then run a simple Autoit script to confirm this:

hex(PixelGetColor($X, $Y)

I am met with a different color hex value (0000DD00).  Shouldn't the 2 hex values match?  If so, am I doing something wrong?

I found this old post describing a similar issue.  

'?do=embed' frameborder='0' data-embedContent>>

I tried to follow the recommendations but encountered a problem.  I made sure that the Coord Mode in AutoItInfo was set to 'screen,' but I couldn't find where to set Opt("PixelCoordMode", ?). It doesn't appear to be in the User Options or Global Options files.

Thanks in advance.

I know this post is old but if your still wondering and for others who are still looking for the solution Check out my post.

 

Edited January 2, 2017 by Nitrolord