PureBasic Forums - English

Posted: **Wed Jun 11, 2003 12:08 am**

Hi,

Iv never done nothing with images in PB, so maybe my questiosn are to basic.

1.- I want to save one image in the imagegadget as bmp

2.- I want to get every pixel on the imagegadget in a array

3.- Im trying to change the color of a image (my question 2 is about this). The image is black and white and maybe i want to do it green and white or red and white etc.
Its some kind of gradient (in fact is a type of 3d button) and i want to change the colors of the 'gradient'.
I do this same thing a time ago in VB using an array to read every pixel on the image and changing for its equivalent on a different gradient.

Can anybody imagine an easier way?

Thanks in advance:P

Posted: **Wed Jun 11, 2003 12:25 am**

I don't know if this is the best way, but that's how I would do it:

Code: Select all

Procedure ChangeGradient(ImageID)
  result = 0
  GetObject_(ImageID, SizeOf(BITMAP), bm.BITMAP)
  bmih.BITMAPINFOHEADER
  bmih\biSize = SizeOf(BITMAPINFOHEADER)
  bmih\biWidth = bm\bmWidth
  bmih\biHeight = bm\bmHeight
  bmih\biPlanes = 1
  bmih\biBitCount = 32
  bmih\biCompression = #BI_RGB
  ImageBits = AllocateMemory(0, bm\bmWidth*bmih\biHeight*4)
  hDC = GetDC_(WindowID())
  If GetDIBits_(hDC, ImageID, 0, bmih\biHeight, ImageBits, bmih, 0)
    BMPSeeker = ImageBits
    For i=0 To bmih\biHeight-1
      For t=0 To bmih\biWidth-1
        RGBColour = PeekL(BMPSeeker)
        ; Do your colour stuff here
        ; Example: exchange red and green values
        RGBColour = ((RGBColour&$FF)<<16)|(RGBColour&$FF00)|((RGBColour&$FF0000)>>16)
        ;
        PokeL(BMPSeeker, RGBColour)
        BMPSeeker+4
      Next t
    Next i
    result = SetDIBits_(hDC, ImageID, 0, bmih\biHeight, ImageBits, bmih, 0)
  EndIf
  ReleaseDC_(WindowID(), hDC)
  FreeMemory(0)
  ProcedureReturn result
EndProcedure

Posted: **Wed Jun 11, 2003 5:25 am**

Thanks El_Choni, i will test it

PureBasic Forums - English

2 begginers question about images (want to save as bmp and

2 begginers question about images (want to save as bmp and