Gray Scale

[chris319]

This handy program draws a gray scale for adjusting your monitor.

Code: Select all

InitSprite(): InitKeyboard()
#screenWd = 1365: #screenHt = 768
OpenWindow(0,0,0, #screenWd, #screenHt, #NULL$,#PB_Window_BorderLess)
AddKeyboardShortcut(0, #PB_Shortcut_Escape, #PB_Shortcut_Escape) ;"ESCAPE" KEY TO QUIT PROGRAM

StartDrawing(WindowOutput(0))
ShowCursor_(#False) ;HIDE MOUSE POINTER
Box(0,0,#SCREENWD,#SCREENHT,$000000)

#STEPS = 12
For ct = 0 To #STEPS - 1
  lum.f = (ct / #STEPS) * 255
  Box(ct * (#screenWd / #STEPS), 0, #screenWd / #STEPS, #screenHt, RGB(lum,lum,lum))
Next





















StopDrawing()

Repeat
event = WaitWindowEvent()
  
  If event = #PB_Event_Repaint

  ElseIf event = #PB_Event_Menu ;KEYBOARD INPUT
      menuItem = EventMenu()

      Select menuItem

Case #PB_Shortcut_Escape
;          FreeFont(1): FreeFont(2)
;          If ImageID(0) <> 0: FreeImage(0): CloseWindow(0): End: EndIf ;ESCAPE KEY PRESSED
          End
                    
    EndSelect 
    
EndIf
ForEver

[RichardL]

Hi,
A version that works with multiple screens and takes the R,G,B values all the way to 255.
RichardL

Code: Select all

NumDeskTops = ExamineDesktops()
For n = 0 To NumDeskTops-1
  ScreenWd = DesktopWidth(n) : Debug "Width "+Str(ScreenWd)
  ScreenHt = DesktopHeight(n)
  OpenWindow(n,DesktopX(n),0, ScreenWd, ScreenHt, #Null$,#PB_Window_BorderLess)
  AddKeyboardShortcut(n, #PB_Shortcut_Escape, #PB_Shortcut_Escape) ;"ESCAPE" KEY TO QUIT PROGRAM
  StartDrawing(WindowOutput(n))
    Box(0,0,ScreenWd,ScreenHt,$000000)
    Steps = 16
    X = 0
    Lum.f = 0
    LumStep.f = 255 / (Steps-1)
    XStep = ScreenWd/Steps
    For ct = 1 To Steps
      Debug Str(X)+"  "+Str(Lum)
      Box(X,0,XStep,ScreenHt, RGB(Lum,Lum,Lum))
      Lum + LumStep
      X   + XStep
    Next
  StopDrawing()
Next

Repeat
  event = WaitWindowEvent()
  If event = #PB_Event_Repaint
    
  ElseIf event = #PB_Event_Menu ;KEYBOARD INPUT
    menuItem = EventMenu()
    
    Select menuItem
        
      Case #PB_Shortcut_Escape
        Break
        
    EndSelect 
    
  EndIf
ForEver
End

[IdeasVacuum]

That's good code RichardL - highlighted just how different my monitors are, even though they are the same make and model. Not sure how I'm going to adjust them though........

[luis]

Not sure how I'm going to adjust them though........

Windows 7 and higher have a built in calibration software for gamma and .. in some way... color.
http://www.pcmag.com/article2/0,2817,2414252,00.asp

For gamma (the only thing you can really set quite reliably by just using your eyes and the environment light you are normally exposed) I use this software with good results -> http://quickgamma.de/indexen.html

For color... better buy a cheap hw + sw combination like http://spyder.datacolor.com/display-calibration/ if possible.

[chris319]

This version continues the white bar all the way to the edge of the screen, and repaints if the window was covered (such as closing the debug window).

Code: Select all

Global screenWd, screenHt

Procedure DrawGrayScale()
      StartDrawing(WindowOutput(n))
        Box(0,0,ScreenWd,ScreenHt,$ffffff)
        Steps = 16
        X = 0
        Lum.f = 0
        LumStep.f = 255 / (Steps-1)
        XStep = ScreenWd/Steps
        For ct = 1 To Steps
          Debug Str(X)+"  "+Str(Lum)
          Box(X,0,XStep,ScreenHt, RGB(Lum,Lum,Lum))
          Lum + LumStep
          X   + XStep
        Next
        StopDrawing()
        Debug "Press ESC to exit."
EndProcedure  

    NumDeskTops = ExamineDesktops()
    For n = 0 To NumDeskTops-1
      ScreenWd = DesktopWidth(n) : Debug "Width "+Str(ScreenWd)
      ScreenHt = DesktopHeight(n)
      OpenWindow(n,DesktopX(n),0, ScreenWd, ScreenHt, #NULL$,#PB_Window_BorderLess)
      AddKeyboardShortcut(n, #PB_Shortcut_Escape, #PB_Shortcut_Escape) ;"ESCAPE" KEY TO QUIT PROGRAM
      
DrawGrayScale()
Next

    Repeat
      event = WaitWindowEvent()
      If event = #PB_Event_Repaint
        DrawGrayScale()
        
      ElseIf event = #PB_Event_Menu ;KEYBOARD INPUT
        menuItem = EventMenu()
       
        Select menuItem
           
          Case #PB_Shortcut_Escape
            Break
           
        EndSelect
       
      EndIf
    ForEver
    End

[RichardL]

Hi,
Your procedure DrawGrayScale() needs to have the Window number passed to it...
and then the Repaint will need to provide a Window number (probably all of them!)
Richard

[chris319]

It was intended to occupy the entire display while the user sets his brightness, contrast, etc., not to draw a gray scale in each open window.

Code: Select all

Global screenWd, screenHt

Procedure DrawGrayScale()
      StartDrawing(WindowOutput(0))
        Box(0,0,ScreenWd,ScreenHt,$ffffff)
        Steps = 16
        X = 0
        Lum.f = 0
        LumStep.f = 255 / (Steps-1)
        XStep = ScreenWd/Steps
        For ct = 1 To Steps
          Debug Str(X)+"  "+Str(Lum)
          Box(X,0,XStep,ScreenHt, RGB(Lum,Lum,Lum))
          Lum + LumStep
          X   + XStep
        Next
        Debug "Press ESC to exit"
        StopDrawing()
EndProcedure  

ExamineDesktops()
      ScreenWd = DesktopWidth(0) ;: Debug "Width "+Str(ScreenWd)
      ScreenHt = DesktopHeight(0)
      OpenWindow(0,0,0, ScreenWd,ScreenHt, #NULL$,#PB_Window_BorderLess)
      AddKeyboardShortcut(n, #PB_Shortcut_Escape, #PB_Shortcut_Escape) ;"ESCAPE" KEY TO QUIT PROGRAM
      DrawGrayScale()

    Repeat
      event = WaitWindowEvent()
      If event = #PB_Event_Repaint
        DrawGrayScale()
        
      ElseIf event = #PB_Event_Menu ;KEYBOARD INPUT
        menuItem = EventMenu()
       
        Select menuItem
           
          Case #PB_Shortcut_Escape
            Break
           
        EndSelect
       
      EndIf
    ForEver
    End
    

[chris319]

Not sure how I'm going to adjust them though........

Windows 7 and higher have a built in calibration software for gamma and .. in some way... color.
http://www.pcmag.com/article2/0,2817,2414252,00.asp

For gamma (the only thing you can really set quite reliably by just using your eyes and the environment light you are normally exposed) I use this software with good results -> http://quickgamma.de/indexen.html

For color... better buy a cheap hw + sw combination like http://spyder.datacolor.com/display-calibration/ if possible.

That's fine with just one combination of computer and monitor, such as a laptop. With one computer and several monitors, IMO you're better off setting the computer's gamma to the standard of 2.2, which can be done with QuickGamma, and dealing with gamma issues in hardware for each individual monitor.

[luis]

Good point, I use it with a single monitor per PC.
With multiple monitors connected to a single PC your approach it's probably better and easier to manage (for you and the software running on it).

[IdeasVacuum]

Darn - Avast really really doesn't like QuickGamma V3 (For XP/Vista). Apparently it is a danger to the entire universe, maybe more.

Edit: QuickGamma is effective, but one of my monitors is determined to keep it's independence.

[chris319]

No problem here running Quick Gamma.

In this thread: http://www.purebasic.fr/english/viewtop ... 12&t=59993 I posted a toy program which will allow you to adjust the Windows gamma ramp. You can set it to 2.2 (the Windows de-facto standard) and unless your monitor is grossly off, it should be pretty close. I'm not a fan of these programs where you squint at a pattern on the screen and try to match gray levels. At least with my gamma toy or Quick Gamma you can set the gamma to the known value of 2.2 and adjust your monitor hardware while you squint at circles.

One gripe about the Windows gamma adjuster is that it is not calibrated, i.e. you don't know what value you're setting it to. If it becomes misadjusted you have to squint at dots all over again instead of returning it to a known, repeatable value.