how to convert a bitmap file to an array ?

[stef]

hello

I can find all kind of procedures to convert an array to a bitmap
(wxPython, PIL),
but I can't find the reverse,
either
- convert a bitmap to an array
or
- read a bitmap file to an array

thanks,
Stef Mientki

 

[Stefan Sonnenberg-Carstens]

hello

I can find all kind of procedures to convert an array to a bitmap
(wxPython, PIL),
but I can't find the reverse,
either
- convert a bitmap to an array
or
- read a bitmap file to an array

thanks,
Stef Mientki

Take a look at the "struct" module.
There you fill find pack/unpack, which can do what you need.

 

[Diez B. Roggisch]

hello

I can find all kind of procedures to convert an array to a bitmap
(wxPython, PIL),
but I can't find the reverse,
either
- convert a bitmap to an array
or
- read a bitmap file to an array

Not true for PIL, Image.getdata and Image.putdata are your friends.

Diez

 

[stef]

Take a look at the "struct" module.
There you fill find pack/unpack, which can do what you need.

thanks Stefan,

but using struct, I need to know how a bitmap file is build,
I don't know that (and I rather don't want to know that ;-)

Any better solutions (I'm a spoiled Delphi user ;-)

cheers,
Stef Mientki

 

[stef]

stef wrote:



Not true for PIL, Image.getdata and Image.putdata are your friends.

thanks Diez,
I really overlooked that.

cheers,
Stef Mientki

 

[Steve Holden]

thanks Stefan,

but using struct, I need to know how a bitmap file is build,
I don't know that (and I rather don't want to know that ;-)

Any better solutions (I'm a spoiled Delphi user ;-)

I can offer the code below, but I can't guarantee you won't need to play
with it. You can almost certainly ignire the fonty bits!

def _setupContext(memory, font=None, color=None):
if font:
memory.SetFont(font)
else:
memory.SetFont(wx.NullFont)
if color:
memory.SetTextForeground(wx.Colour(*color))

def write( text, bitmap, pos=(0,0), font=None, color=None):
"""Simple write into a bitmap doesn't do any checking."""
memory = wx.MemoryDC()
_setupContext(memory, font, color)
memory.SelectObject(bitmap)
width, height = memory.GetTextExtent(text)
try:
memory.DrawText(text, pos[0],pos[1],)
finally:
memory.SelectObject(wx.NullBitmap)
return width

def bitmapToPil(bitmap):
return imageToPil(bitmapToImage(bitmap))

def bitmapToImage(bitmap):
return wx.ImageFromBitmap(bitmap)


def pilToBitmap(pil):
return imageToBitmap(pilToImage(pil))

def pilToImage(pil):
image = wx.EmptyImage(pil.size[0], pil.size[1])
image.SetData(pil.convert('RGB').tostring())
return image

def imageToPil(image):
pil = Image.new('RGB', (image.GetWidth(), image.GetHeight()))
pil.fromstring(image.GetData())
return pil

def imageToBitmap(image):
return image.ConvertToBitmap()


regards
Steve
--
Steve Holden +1 571 484 6266 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://del.icio.us/steve.holden
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