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Get avg color of portion of the screen

 
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infogulch



Joined: 27 Mar 2008
Posts: 130
Location: KC, MO
PostPosted: Thu Jul 17, 2008 3:41 pm    Post subject: Get avg color of portion of the screen Reply with quote
i need to get the average color of a portion of the screen, and i don't want to do a PixelGetColor as that takes a long time (think 50x50 px portion is 2500 pixels) so i thought i'd use Gdi+ to capture a portion of the screen, and perhaps blur it 100% to find the average. (there's probably a better way)

this uses tic's Gdip_ lib. it can be found Here

this is just a test script and it CRASHES ahk, so don't run it as is. Razz i ultimately want to wrap it in a function that maybe returns the color found in hex?

Code:

SetWorkingDir, %A_ScriptDir%

;my desktop is the most colorful part of my computer, give me time to switch to it :P
MsgBox, Ready?

If !pToken := Gdip_Startup()
{
   MsgBox, 48, gdiplus error!, Gdiplus failed to start. Please ensure you have gdiplus on your system
   ExitApp
}

Y1 := 0
Y2 := 50

Loop 5
{ ;loop to get 5 different portions of the screen

   ;construct the coordinates
   X1 := ( A_Index - 1 ) * 50
   X2 := A_Index * 50
   Coord = %X1%|%Y1%|%X2%|%Y2%
   
   pBitmap := Gdip_BitmapFromScreen(Coord)   ; get a 50x50 px square at the coord
   G := Gdip_GraphicsFromImage(pBitmap)   ; this is where i think i've gone wrong
   ;blur it 100% to make it one color - i.e. get the average (i think)
   Gdip_BlurBitmap(G, 100)               ; because this crashes the script!!

   StringReplace, Coord, Coord, |, ., All
   Gdip_SaveBitmapToFile(pBitmap, "BlurredScr_" Coord "_.bmp") ;save the image w/ coord in filename

; The bitmap can be deleted
   Gdip_DisposeImage(pBitmap)
; The graphics may now be deleted
   Gdip_DeleteGraphics(G)
}

; ...and gdi+ may now be shutdown
Gdip_Shutdown(pToken)
ExitApp



Thanks for your help Very Happy
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tic



Joined: 22 Apr 2007
Posts: 1355
PostPosted: Thu Jul 17, 2008 4:49 pm    Post subject: Reply with quote
An interesting challenge.....look at my response on the Gdi+ thread, and hopefully you like the script. ask if you dont understand how ive done anything, as im sure it could be a bit confusing Smile
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tic



Joined: 22 Apr 2007
Posts: 1355
PostPosted: Thu Jul 17, 2008 5:06 pm    Post subject: Reply with quote
Mmmm I've done some testing, and it doesn't appear to take the average with the way I have used. I think I could write another way, but it would require machine code to do it fast enough (although the c++ function would be very short)
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infogulch



Joined: 27 Mar 2008
Posts: 130
Location: KC, MO
PostPosted: Thu Jul 17, 2008 6:28 pm    Post subject: Reply with quote
thanks! i'll take a look Smile ( link to Gdi+ post )
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infogulch



Joined: 27 Mar 2008
Posts: 130
Location: KC, MO
PostPosted: Fri Jul 18, 2008 9:41 pm    Post subject: Reply with quote
right, it seems like it gets the color of the top left pixel of the selection. pretty neat anyway Wink

i was wondering about the GetPixel function, is the number it returns relevant/useable by ahk directly, or just gdi+? i noticed it returns ARGB (var) , but the number of digits are different for different colors, e.g. black is -16777216 and white is -1. (i think)

i've done some research, so i think i've got a general idea of how you're doing it. ( lol, yeah right Razz ) but an explaniation of variable prefixes would really help. (like the "p" in "pBitmap") looking thru the lib i saw p, h, maybe w? i guess i'm wanting to know what the functions return, and what ahk is dealing with.

i would really appreciate a solution to the average color. it's too bad you'd have to go to c++ to get it done, but speed is really a priority, oh well. i hope it's not too much trouble for you. Confused Smile

thanks agian for your help Very Happy
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