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#!/usr/bin/python
import StringIO
import gtk
from PIL import Image, ImageFilter
def image_to_pixbuf(image):
# this one handles transparency, unlike the default example in the pygtk FAQ
# this is also from the pygtk FAQ
IS_RGBA = image.mode=='RGBA'
return gtk.gdk.pixbuf_new_from_data(
image.tostring(), # data
gtk.gdk.COLORSPACE_RGB, # color mode
IS_RGBA, # has alpha
8, # bits
image.size[0], # width
image.size[1], # height
(IS_RGBA and 4 or 3) * image.size[0] # rowstride
)
def image_to_pixbuf_no_transparency(image):
fd = StringIO.StringIO()
image.save(fd, "ppm")
contents = fd.getvalue()
fd.close()
loader = gtk.gdk.PixbufLoader("pnm")
loader.write(contents, len(contents))
pixbuf = loader.get_pixbuf()
loader.close()
return pixbuf
def pixbuf_to_image(pb):
assert(pb.get_colorspace() == gtk.gdk.COLORSPACE_RGB)
dimensions = pb.get_width(), pb.get_height()
stride = pb.get_rowstride()
pixels = pb.get_pixels()
mode = pb.get_has_alpha() and "RGBA" or "RGB"
image = Image.frombuffer(mode, dimensions, pixels,
"raw", mode, stride, 1)
if mode == "RGB":
# convert to having an alpha value, so that the image can
# act as a mask in the drop shadow paste
image = image.convert("RGBA")
return image
class DropShadow():
"""
Adds a gaussian blur drop shadow to a PIL image.
Caches backgrounds of particular sizes for improved performance.
Backgrounds can be made transparent.
Modification of code from Kevin Schluff and Matimus
License: Python license
See:
http://code.activestate.com/recipes/474116/ (r2)
http://bytes.com/topic/python/answers/606952-pil-paste-image-top-other-dropshadow
"""
def __init__(self, offset=(5,5), background_color=0xffffff, shadow = (0x44, 0x44, 0x44, 0xff),
border=8, iterations=3, trim_border=False):
"""
offset - Offset of the shadow from the image as an (x,y) tuple. Can be
positive or negative.
background_color - Background colour behind the image.
shadow - Shadow colour (darkness).
border - Width of the border around the image. This must be wide
enough to account for the blurring of the shadow.
trim_border - If true, the border will only be created on the
sides it needs to be (i.e. only on two sides)
iterations - Number of times to apply the filter. More iterations
produce a more blurred shadow, but increase processing time.
To make backgrounds transparent, ensure the alpha value of the shadow color is the
same as the background color, e.g. if background_color is 0xffffff, shadow's alpha should be 0xff
The image must be in RGBA format.
"""
self.backgrounds = {}
self.offset = offset
self.background_color = background_color
self.shadow = shadow
self.border = border
self.trim_border = trim_border
self.iterations = iterations
if self.offset[0] < 0 or not self.trim_border:
self.left_spacing = self.border
else:
self.left_spacing = 0
if self.offset[1] < 0 or not self.trim_border:
self.top_spacing = self.border
else:
self.top_spacing = 0
def dropShadow(self, image):
"""
image - The image to overlay on top of the shadow.
"""
dimensions = (image.size[0], image.size[1])
if not dimensions in self.backgrounds:
# Create the backdrop image -- a box in the background colour with a
# shadow on it.
if self.trim_border:
totalWidth = image.size[0] + abs(self.offset[0]) + self.border
totalHeight = image.size[1] + abs(self.offset[1]) + self.border
else:
totalWidth = image.size[0] + abs(self.offset[0]) + 2 * self.border
totalHeight = image.size[1] + abs(self.offset[1]) + 2 * self.border
back = Image.new("RGBA", (totalWidth, totalHeight), self.background_color)
# Place the shadow, taking into account the offset from the image
if self.offset[0] > 0 and self.trim_border:
shadowLeft = max(self.offset[0], 0)
else:
shadowLeft = self.border + max(self.offset[0], 0)
if self.offset[1] > 0 and self.trim_border:
shadowTop = max(self.offset[1], 0)
else:
shadowTop = self.border + max(self.offset[1], 0)
back.paste(self.shadow, [shadowLeft, shadowTop, shadowLeft + image.size[0],
shadowTop + image.size[1]] )
# Apply the filter to blur the edges of the shadow. Since a small kernel
# is used, the filter must be applied repeatedly to get a decent blur.
n = 0
while n < self.iterations:
back = back.filter(ImageFilter.BLUR)
n += 1
self.backgrounds[dimensions] = back
# Paste the input image onto the shadow backdrop
imageLeft = self.left_spacing - min(self.offset[0], 0)
imageTop = self.top_spacing - min(self.offset[1], 0)
back = self.backgrounds[dimensions].copy()
back.paste(image, (imageLeft, imageTop), image)
return back
if __name__ == "__main__":
import sys
import os
import common
# create another file with a drop shadow
f = sys.argv[1]
image = Image.open(f)
image.thumbnail((60,36), Image.ANTIALIAS)
image2 = image.copy()
path, name = os.path.split(f)
name, ext = os.path.splitext(name)
#image = dropShadow(image, shadow = (0x44, 0x44, 0x44, 0xff))
dropShadow = DropShadow(offset=(3,3), shadow = (0x34, 0x34, 0x34, 0xff), border=6)
image = dropShadow.dropShadow(image)
image2 = dropShadow.dropShadow(image2)
nf = os.path.join(path, "%s_small_shadow%s" % (name, ext))
nf2 = os.path.join(path, "%s_small_shadow2%s" % (name, ext))
image.save(nf)
image2.save(nf2)
print "wrote %s , %s" % (nf, nf2)
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