PIL and line drawing

[Leonard J. Reder]

Hello,

I am using PIL to annotate some images with lines. I could not
find anyway to make the line that is drawn from the ImageDraw object
thicker. Does anyone have a suggestion or solution for solving this
without to much hacking?

Thanks for any replies,

Len
--
=============== =============== =====
Leonard J. Reder
Home office email : re***@ieee.org
Lab email : re***@jpl.nasa. gov
Lab web page : http://reder.jpl.nasa.gov
=============== =============== =====

[Fredrik Lundh]

Leonard J. Reder wrote:

I am using PIL to annotate some images with lines. I could not
find anyway to make the line that is drawn from the ImageDraw object
thicker. Does anyone have a suggestion or solution for solving this
without to much hacking?
if you have 1.1.5, you can use the width option to control
the line width. see:

http://effbot.org/imagingbook/imagedraw.htm
Thanks for any replies,

tip: you may get quicker/better responses if you use the
image-sig mailing list (if you're using a newsreader, point
it to gmane.comp.pyth on.image)

</F>

[rzed]

"Fredrik Lundh" <fr*****@python ware.com> wrote in
news:ma******** *************** **************@ python.org:

Leonard J. Reder wrote:

I am using PIL to annotate some images with lines. I could not
find anyway to make the line that is drawn from the ImageDraw
object thicker. Does anyone have a suggestion or solution for
solving this without to much hacking?
if you have 1.1.5, you can use the width option to control
the line width. see:

I'm glad to see that addition. I was surprised to see that 'width'
is actually doubled in the resulting line, though. I suppose the
code adds and subtracts the specified width from the specified
coordinate point(?). I'd love to see width added to arc, circles,
etc., though if it is, I'd much prefer that it not be centered on
the coordinate point, but added only to the outer edge (or
subtracted from the inner edge); it would make placement much
easier, I'd think.

At the moment, whenever I need to generate thick-lined circles and
rectangles, I have to create a second image of the desired color,
then another mask image to contain a black rectangle (say) of the
required outer size, then within that a white rectangle of the
inner size, then use that mask to paste the color onto the original
image. The results are satisfactory, but the method seems clunky at
best. Maybe there's a better way. Even if this were the exact
method used, I'd rather see it automated in C than manually done in
Python.
http://effbot.org/imagingbook/imagedraw.htm

Thanks for any replies,

tip: you may get quicker/better responses if you use the
image-sig mailing list (if you're using a newsreader, point
it to gmane.comp.pyth on.image)

--
rzed

[Fredrik Lundh]

"rzed" <je***@comics.c om> wrote:

if you have 1.1.5, you can use the width option to control
the line width. see:

I'm glad to see that addition. I was surprised to see that 'width'
is actually doubled in the resulting line, though. I suppose the
code adds and subtracts the specified width from the specified
coordinate point(?).

hmm. that sure sounds a lot like a bug I though I had fixed.

</F>

[rzed]

"Fredrik Lundh" <fr*****@python ware.com> wrote in
news:ma******** *************** **************@ python.org:

"rzed" <je***@comics.c om> wrote:

> if you have 1.1.5, you can use the width option to control
> the line width. see:

I'm glad to see that addition. I was surprised to see that
'width' is actually doubled in the resulting line, though. I
suppose the code adds and subtracts the specified width from
the specified coordinate point(?).

hmm. that sure sounds a lot like a bug I though I had fixed.

Ah, I see that I was using VERSION = "1.1.5b1" which I have now
upgraded to 1.1.5. Retesting ... nope, same thing. Specifying a
width of 10, I get a line of width 20. ImageDraw shows:

# $Id: ImageDraw.py 2134 2004-10-06 08:55:20Z fredrik $

--
rzed