|
I'm writing a
small wxPython application that performs a hue rotation on all graphics
and CSS files in a website template. It successfully displays and
saves PNG files with transparency, but cannot save GIF files with
transparency from wxPython, so I'm trying to save a transparent GIF
from PIL, so far without success. The hue rotation works, the code
saves the GIF in a file, but the GIF's pixels that should be
transparent come out black. This is a PIL question because I'm converting a wx.Image to a PIL.Image and using PIL to save the GIF. I've read and tested nearly everything about this question I can turn up on Google and my code still doesn't work. Could someone here recommend a fix to my attached working sample code (probably to line 39 or 41)? Thank you! Tim Black |
#Boa:Frame:Frame1 import wx import PIL from PIL import Image
def create(parent):
return Frame1(parent)
[wxID_FRAME1] = [wx.NewId() for _init_ctrls in range(1)]
class Frame1(wx.Frame):
def _init_ctrls(self, prnt):
wx.Frame.__init__(self, style=wx.DEFAULT_FRAME_STYLE, name='',
parent=prnt, title='Frame1', pos=wx.Point(-1, -1), id=wxID_FRAME1,
size=wx.Size(-1, -1))
def __init__(self, parent):
self._init_ctrls(parent)
wxim = wx.Image('logo.gif')
bmp = wxim.ConvertToBitmap() # emulates necessary conversion in larger
program
wxim = bmp.ConvertToImage()
## wxim.ConvertAlphaToMask() # allows transparency to display
## wxim.InitAlpha() # later in wx.BitmapButton
wxim.RotateHue(0.4)
imageData = wxim.GetData()
## print imageData
if wxim.HasAlpha(): # GIF files don't create an alpha channel, so this
section is for reference
print 'has alpha'
alpha = wxim.GetAlphaData()
i = 0
newImageData = ''
for alphaVal in alpha: # map alpha values into RGB imageData to
create RGBA newImageData
i = i + 3
newImageData = newImageData + str(imageData[i-3:i]) +
str(alphaVal)
imagePIL = PIL.Image.fromstring('RGBA', (wxim.GetWidth(),
wxim.GetHeight()), newImageData)
imagePIL = imagePIL.convert('RGB') # because PIL.Image can't
convert RGBA -> P
else:
imagePIL = PIL.Image.fromstring('RGB', (wxim.GetWidth(),
wxim.GetHeight()), imageData)
imagePIL = imagePIL.convert("P", dither=Image.NONE,
palette=Image.ADAPTIVE) # prevent dithering
imagePIL.info["transparency"] = 0
## print imagePIL.info, imagePIL.mode
imagePIL.save('logo2.gif', transparency=0)
if __name__ == '__main__':
app = wx.PySimpleApp()
wx.InitAllImageHandlers()
frame = create(None)
## frame.Show()
##
## app.MainLoop()
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