Fastest way to tint an image with PIL

[Dan Moskowitz]

Hi,

I'm using PIL to tint and composite images together. Here's how I'm
currently tinting images, it's really slow and I know there's got to
be a better way:

def TintImage( im, tintColor ):
tint = (tintColor[0]/255.0, tintColor[1]/255.0, tintColor[2]/255.0,
tintColor[3]/255.0)
pix = im.load()
for x in xrange( im.size[0] ):
for y in xrange( im.size[1] ):
c = pix[x,y]
pix[x,y] = (int(c[0]*tint[0]), int(c[1]*tint[1]),
int(c[2]*tint[2]), c[3])

I thought maybe there's a way to do it using the transform method, but
I haven't figure it out yet. Anyone?

Thanks
-Dan

[Peter Otten]

Dan Moskowitz wrote:

I'm using PIL to tint and composite images together. Here's how I'm
currently tinting images, it's really slow and I know there's got to
be a better way:

def TintImage( im, tintColor ):
tint = (tintColor[0]/255.0, tintColor[1]/255.0, tintColor[2]/255.0,
tintColor[3]/255.0)
pix = im.load()
for x in xrange( im.size[0] ):
for y in xrange( im.size[1] ):
c = pix[x,y]
pix[x,y] = (int(c[0]*tint[0]), int(c[1]*tint[1]),
int(c[2]*tint[2]), c[3])

I thought maybe there's a way to do it using the transform method, but
I haven't figure it out yet. Anyone?

Too lazy to read the manual? How about

def tint_image(im, color):
color_map = []
for component in color:
color_map.extend(int(component/255.0*i) for i in range(256))
return im.point(color_map)

Peter

[Marc 'BlackJack' Rintsch]

On Thu, 06 Nov 2008 13:08:59 -0800, Dan Moskowitz wrote:

I'm using PIL to tint and composite images together. Here's how I'm
currently tinting images, it's really slow and I know there's got to be
a better way:

def TintImage( im, tintColor ):
tint = (tintColor[0]/255.0, tintColor[1]/255.0, tintColor

[2]/255.0,

tintColor[3]/255.0)
pix = im.load()
for x in xrange( im.size[0] ):
for y in xrange( im.size[1] ):
c = pix[x,y]
pix[x,y] = (int(c[0]*tint[0]), int(c[1]*tint[1]),
int(c[2]*tint[2]), c[3])

I thought maybe there's a way to do it using the transform method, but I
haven't figure it out yet. Anyone?

from PIL import Image, ImageChops

def tint_image(image, tint_color):
return ImageChops.multiply(image,
Image.new('RGB', image.size, tint_color))

Ciao,
Marc 'BlackJack' Rintsch