Hi,

A coupla questions from the newb...

I am trying to write my first python-fu plug-in and I cannot get it to install. Here"s how I am pushing it to the plugins dir:

cp VanDerWalt.py ~/.gimp-2.4/plug-ins/python-fu-vanderwalt.py chmod +x ~/.gimp-2.4/plug-ins/python-fu-vanderwalt.py

Then I look for it under /Filters/Render/ and it is not there.

It"s a color filter that attempts to extract the bluest pixels, like this:

RED, GRN, BLU = 0, 1, 2 bluemask = (image[...,BLU] > 1.4*image[...,GRN]) & \ (image[...,BLU] > 1.4*image[...,RED])
blue_layer = gimp.layer(bluemask, width, height, RGBA_IMAGE, 100, NORMAL_MODE) image.addlayer(blue_layer, 0)

Q1) Is this even close? Q2) can I continue to use numpy (as I was with wx.Python) or do these images have to be treated with scipy?

This is a volunteer project for the International Environmental Data Rescue Org (http://iedro.org), so if somebody wants to help me with it... the script is attached though it has not run yet :-o

It is for converting rasterized weather charts (stripcharts) to vector data for weather modeling.

paul

Thanks very much, Chris.

I am using your file now and made a coupla repairs, afaict. But it still doesnt install. Now I may know why, as running it straight up gives No module named gimpfu!

I am on a Mac. Did the gimp2.4.5...dmg not compile gimpfu? Answer may be: Look for a dot .so file:

find /Applications/Gimp.app/ -name gimpfu\* | grep \.so /Applications/Gimp.app//Contents/Resources/lib/gimp/2.0/python/gimpfu.py /Applications/Gimp.app//Contents/Resources/lib/gimp/2.0/python/gimpfu.pyc /Applications/Gimp.app//Contents/Resources/lib/gimp/2.0/python/gimpfu.pyo == false positive.

What should I do next?

paul ----

% cd /Users/paultaney/gimp/gimp-2.4.7/plug-ins/pygimp/plug-ins % ./python-fu-Vanderwalt.py
Traceback (most recent call last):
File "./python-fu-Vanderwalt.py", line 20, in from gimpfu import * # imports the symbols gimp, pdb, register and main ImportError: No module named gimpfu

----

Then I look for it under /Filters/Render/

and it is not there.

...is still the case. I am also pushing it twice, like: % cp python-fu-vanderwalt.py ~/.gimp-2.4/plug-ins % chmod +x ~/.gimp-2.4/plug-ins/python-fu-vanderwalt.py % cp python-fu-vanderwalt.py ~/gimp/gimp-2.4.7/plug-ins/pygimp/plug-ins % chmod +x ~/gimp/gimp-2.4.7/plug-ins/pygimp/plug-ins/python-fu-vanderwalt.py

RED, GRN, BLU = 0, 1, 2
bluemask = (image[...,BLU] > 1.4*image[...,GRN])

& \

(image[...,BLU] > 1.4*image[...,RED])

blue_layer = gimp.layer(bluemask, width, height,

RGBA_IMAGE, 100, NORMAL_MODE)

image.addlayer(blue_layer, 0)

Q1) Is this even close? Q2) can I continue to use numpy (as I was with

wx.Python) or do these images have to be treated with scipy?

Hi Paul,

I found a few mistakes here and there. The main one is that Python is
very strict about indentation. After that, the "import Interpolate"
line I changed to "from scipy import interpolate as ma" - I'm not sure
if that is correct or not. Lastly, there were some items like
"PF_ITEM("foo", _("foo"),
"foo")" that I changed to
"PF_ITEM("foo",
"foo", "foo")" and also I added
"Vanderwalt" to the end on the plug-in resgistration. Oh yeah - I also added an 'except' in somewhere befor
a "finally"...

So... now it still does not run correctly, but at least it registers
with GIMP :|

BTW - starting GIMP from the command line will show syntax errors in
py-fu scripts.... Also editors like scite and eric (among others)
show indentation problems in Python by default - these are probably in
your repositories.

HTH,
Chris

Thanks very much, Chris.

I am using your file now and made a coupla repairs,

afaict.

But it still doesnt install. Now I may know why, as

running

it straight up gives No module named gimpfu!

AFAIK, you can't run gimp-fu scripts outside of GIMP. There is a
python-fu console (XTNS->Python-Fu->Console) that will allow you to type/paste code in.

When it doesn't register, is there any console output from GIMP?

No, but if I try to import it in the console I get something revealing:

import python-fu-vanderwalt

File "", line 1
import python-fu-vanderwalt
^
SyntaxError: invalid syntax

I would not be suprised if python objects to minus signs in module names, so I have fixed that in my push script:

% cat push.sh cp python-fu-vanderwalt.py ~/.gimp-2.4/plug-ins/python_fu_vanderwalt.py chmod +x ~/.gimp-2.4/plug-ins/python_fu_vanderwalt.py cp python-fu-vanderwalt.py ~/gimp/gimp-2.4.7/plug-ins/pygimp/plug-ins/python_fu_vanderwalt.py chmod +x ~/gimp/gimp-2.4.7/plug-ins/pygimp/plug-ins/python_fu_vanderwalt.py

Still, it does not appear in the Xtns browser or /Filters/Render.

Maybe it has to be Capitalized , as in the script...

Nope. That"s not it; I just tested for that, but it is something REALLY STUPID. Je garantir.

paul

Hi Chris,

It was a versions problem: I am not running my local copy of 2.4.7, I am running the one that the .dmg installed at /Applications/Gimp.app.

Now that I"ve got that straight, I can run new scripts at

/Applications/Gimp.app/Contents/Resources/lib/gimp/2.0/plug-ins

but it will not recognize any installed at ~/.gimp-2.0/plug-ins.

I can live with that.

Sorry about the missing comma; it was late when I added that line. I am running Komodo, so I do see the parser"s hints as a rule.

Thanks again, paul

--- On Mon, 9/22/08, Chris Mohler wrote:

From: Chris Mohler
Subject: Re: [Gimp-developer] newb questions re python-fu To: "paul taney"
Cc: "gimp"
Date: Monday, September 22, 2008, 6:51 PM On Mon, Sep 22, 2008 at 5:41 PM, paul taney wrote:

Thanks very much, Chris.

I am using your file now and made a coupla

repairs,

afaict.

But it still doesnt install. Now I may know

why, as

running

it straight up gives No module named gimpfu!

AFAIK, you can't run gimp-fu scripts outside

of GIMP.

There is a
python-fu console (XTNS->Python-Fu->Console)

that

will allow you to type/paste code in.

When it doesn't register, is there any console

output

from GIMP?

No, but if I try to import it in the console I get

something revealing:

import python-fu-vanderwalt

File "", line 1
import python-fu-vanderwalt
^
SyntaxError: invalid syntax

I would not be suprised if python objects to minus

signs in module names,

so I have fixed that in my push script:

% cat push.sh cp python-fu-vanderwalt.py

~/.gimp-2.4/plug-ins/python_fu_vanderwalt.py

chmod +x ~/.gimp-2.4/plug-ins/python_fu_vanderwalt.py cp python-fu-vanderwalt.py

~/gimp/gimp-2.4.7/plug-ins/pygimp/plug-ins/python_fu_vanderwalt.py

chmod +x

~/gimp/gimp-2.4.7/plug-ins/pygimp/plug-ins/python_fu_vanderwalt.py

Still, it does not appear in the Xtns browser or

/Filters/Render.

Maybe it has to be Capitalized , as in the script...

Nope. That"s not it; I just tested for that, but

it is something

REALLY STUPID. Je garantir.

Hi Paul,

I did not look at it very carefully, but there are still indentation
errors. I recommend opening it in Eric - it will literally show a
"bug" on the line(s) in question. You're also missing a comma on line
92...

Chris

When it doesn't register, is there any console output from GIMP?

Chris

I"ve got things working now and use numpy to convert bluelines to SVG lines or a python tuple that gets written out.

It could be of general interest for vectorizing if it treated a selection.

But I am converting scanned stripcharts, and the ink is blue... One y per x is all I need, and there would be a slick way to do that with numpy; I"m just using a stride for line thinning.

The part I dont understand is this; I pass my bluemask to (Fremlin"s) write_out(drawable, image) as the image, it fails the assertion and does not post...

numpy.array((image*256).round(0),"B")

def write_out(drawable, image): """by John Fremlin"""
byte_image = numpy.array((image*256).round(0),"B") # B is a ubyte width = drawable.width
height = drawable.height
bpp = drawable.bpp
sys.stderr.write("write_out::drawable.width=%i drawable.height=%i drawable.bpp=%i\n" % (width, height, bpp))

pr = drawable.get_pixel_rgn(0, 0, width, height, True) assert(byte_image.size == width * height * bpp) pr[:,:] = byte_image.tostring()

--- On Thu, 9/25/08, David Gowers wrote:

From: David Gowers

Hi Paul,

On Fri, Sep 26, 2008 at 2:19 AM, paul taney wrote:

When it doesn't register, is there any console

output

from GIMP?

Chris

I"ve got things working now and use numpy to

convert bluelines to SVG lines or a python tuple that gets written out.

It could be of general interest for vectorizing if it

treated a selection.

But I am converting scanned stripcharts, and the ink

is blue... One y per x is all I need, and there would be a slick way to do that with numpy; I"m just using a stride for line thinning.

The part I dont understand is this; I pass my bluemask

to (Fremlin"s) write_out(drawable, image) as the image, it fails the assertion and does not post...

numpy.array((image*256).round(0),"B")

Why does he multiply the image by 256 and elsewhere divide image/256?

Which assertion fails?

Line 207: assert(byte_image.size == width * height * bpp) fails, right before the blit.

def write_out(drawable, image):
"""by John Fremlin"""
byte_image =

numpy.array((image*256).round(0),"B") # B is a ubyte

width = drawable.width
height = drawable.height
bpp = drawable.bpp
sys.stderr.write("write_out::drawable.width=%i

drawable.height=%i drawable.bpp=%i\n" % (width, height, bpp))

pr = drawable.get_pixel_rgn(0, 0, width, height,

True)

assert(byte_image.size == width * height * bpp) pr[:,:] = byte_image.tostring() # blit

You are passing an RGB array to this function. Are you certain that
your destination drawable does not have an alpha channel (thus requiring you to pass an RGBA array)?

I have added a test for that, as best I know how; but it still fails at 207.

if drawable.has_alpha: img = gimp.Image(width, height, RGBA_IMAGE) new_layer = gimp.Layer(img, new_layer_name, width, height, RGBA_IMAGE, opacity, NORMAL_MODE) else:
img = gimp.Image(width, height, RGB_IMAGE) new_layer = gimp.Layer(img, new_layer_name, width, height, RGB_IMAGE, opacity, NORMAL_MODE)