Comments on: Batch image manipulation using Python and GIMP

By: Erik Pistelli

Erik Pistelli — Mon, 23 Mar 2020 11:48:49 +0000

In reply to george.

Hey George,
it expects a float and not an integer. Just write the following instead:
img.layers[0].opacity=50.0
Don’t forget the .0, otherwise it will interpret it as an int.
Kind regards
Erik

By: george

george — Sun, 22 Mar 2020 18:30:13 +0000

tried it, it did not work? what did i do wrong?
Thanks’
GIMP 2.8.4 Python Console
Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]
>>> img=gimp.image_list()[0]
>>> img.layers[0].opacity=50
Traceback (most recent call last):
File “”, line 1, in
TypeError: type mismatch

By: Trish Carlson

Trish Carlson — Wed, 30 Jan 2019 00:01:55 +0000

Since I went to Linux, code is so visible, Python looks OK since I should get a language started. That comment about Lisp made me laugh, saw some elsewhere. Love the Gimp, hmm batches.

By: dpistelli

dpistelli — Tue, 11 Sep 2018 20:37:53 +0000

In reply to G. Hello G, glad it was useful. Many thanks for the information!

By: G

Tue, 11 Sep 2018 12:43:41 +0000

Thanks, that’s great – helped to fill in some handy pieces.
To add/retain transparency you add an alpha channel to a layer:
pdb.gimp_layer_add_alpha(timage.layers[0])
Otherwise, transparent pixels are filled with black or the background color.

By: dpistelli

dpistelli — Fri, 31 Aug 2018 20:32:11 +0000

In reply to tonyweb. Thank you tony, it's a small thing, but, as you said, it might be useful someday :)

By: tonyweb

tonyweb — Fri, 31 Aug 2018 12:18:23 +0000

Thank you Daniel for sharing your findings 🙂

I know almost nothing about python but, yes, it’s used pretty everywhere … so I should start taking a look at it seriously. 🙂

Thanks for the skeleton code … it might be useful whenever I had to use GIMP 😉

Best Regards,
Tony