PureBasic Forums - English

Posted: **Sun Apr 01, 2018 11:02 pm**

Hello everybody,

Is there any way to create larger than 32000px height Image... I need to create 150000-200000 pixel height photos...
Any tricks to do this?

Thaks!

Posted: **Mon Apr 02, 2018 12:02 am**

arma wrote:Is there any way to create larger than 32000px height Image... I need to create 150000-200000 pixel height photos

A picture that size in 32 bits per pixel would require over a Terabyte of memory

Perhaps there may be some useful information in these links regarding this common problem:

http://www.purebasic.fr/english/viewtop ... 13&t=66710
http://www.purebasic.fr/english/viewtop ... 13&t=66050
http://www.purebasic.fr/english/viewtop ... 13&t=58655
http://www.purebasic.fr/english/viewtop ... 13&t=57438
http://www.purebasic.fr/english/viewtop ... 12&t=56288

Posted: **Mon Apr 02, 2018 9:04 pm**

No no you did missunderstand me, I need 150000-200000pixel in one direction,
for example 1024x200000. or 200000x800, etc.
Then it costs memory around 1GB of RAM. Also I dont have memory problem,
I have 128GB RAM. But i need to create that kind of resulation photos... If possible.
If NOT, i find external solutions. But that solutions makes my program runs slower

Posted: **Tue Apr 03, 2018 11:37 am**

You can create an image at large scale as long as it fit in less than 2 GB.

Just disable debugger around canvas or image creation:

Code: Select all

#maxH=100000; Change size here

Procedure DrawSomething()
  StartDrawing(CanvasOutput(2))
    LineXY(0, 0, 800, #maxH, #Red)
  StopDrawing()
EndProcedure
Procedure ClrSomething()
    StartDrawing(CanvasOutput(2))
    Box(0, 0, 800, #maxH, #White)
  StopDrawing()

EndProcedure


OpenWindow(1, 10, 10, 1024, 758, "")
DisableDebugger
hScrollArea=ScrollAreaGadget(1, 0, 0, 824, WindowHeight(1), 800, #maxH)
hCanvas=CanvasGadget(2, 0, 0, 800, #maxH)
CloseGadgetList()
EnableDebugger
Debug hCanvas
Debug hScrollArea
If hCanvas
  ButtonGadget(3, 900, 10, 48, 24, "Draw")
  ButtonGadget(4, 900, 50, 48, 24, "Clear")
  BindGadgetEvent(3, @DrawSomething())
  BindGadgetEvent(4, @ClrSomething())
EndIf
Repeat
  Event=WaitWindowEvent()
Until Event=#PB_Event_CloseWindow

The limiting factor here is the CanvasGadget.
It can't be larger than 32768 in either direction.

Be carefull at the upper end of canvas/image size.
The handle starts to be unreliable as indicator for a successful created canvas/image when it approches the maximum usable memory.

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