On Fri, Nov 9, 2012 at 1:56 PM, Lorgach wrote:

In order to cut down on time, and also to gain experience I decided to modify some of the scripts that were written by experienced Python programmers to see what effects I could produce on various images. However, I have found that when I make even minor changes to a script and save the changed script to the ‘plug-ins’ folder under a new name, it will not show up in the Gimp Drop Down Menu specified in the script. I would like to know if anyone else has come across this snag and, if so, what is the cause or if there is a solution.

You'll need to restart GIMP for it to pick up a new plug-in. Once it appears you can edit it, as long as the menu item hasn't changed.

The "proc_name" must be unique - this is defined in the "register" function.

If there's a syntax error, the plug-in won't load.

Start GIMP in a command terminal to catch start-up errors.

Chris

On 11/09/2012 08:56 PM, Lorgach wrote:

Hi,

I’m trying to introduce myself to programming in Python for Gimp, however I’m having difficulty in trying to run some scripts and I’m hoping that some of the more knowledgeable members on the Forum will be able to give me some assistance.

In order to cut down on time, and also to gain experience I decided to modify some of the scripts that were written by experienced Python programmers to see what effects I could produce on various images. However, I have found that when I make even minor changes to a script and save the changed script to the ‘plug-ins’ folder under a new name, it will not show up in the Gimp Drop Down Menu specified in the script. I would like to know if anyone else has come across this snag and, if so, what is the cause or if there is a solution. Is there some kind of compiled code associated with a Python script when it has been saved under a ‘Name.py’ or when it has been run in Gimp that prevents it from being capable of being changed or edited.

I am using Gimp 2.8, Windows XP and the Komodo editor to make the changes.

Any help would be appreciated.

Python is very picky about indentation (tabs are not equivalent to spaces) so editing of working code by newcomers usually elicits syntax errors, and these errors make the plugin registration fail. They can be displayed using gimp-console but there is an even faster way: in a commant prompt, outside of Gimp, execute:

python the_plugin.py

The worst syntax errors will be displayed then. If you go as far as getting:

from gimpfu import * ImportError: No module named gimpfu

then the syntax is somewhat correct and you can expect the script to run enough to register.

On Fri, 9 Nov 2012 15:15:45 -0600, Chris Mohler wrote:

Start GIMP in a command terminal to catch start-up errors.

That doesn't work on Windows, but modifying the shortcut to pass --verbose to gimp-2.8.exe will bring up a console.

On 11/12/2012 02:13 AM, Lorgach wrote:

Thanks a lot for the sugestions guys, I'll probably keep pluging away at trying to get some working code as time permits as I'm interested in learning Python. I was hoping that I'd be able to easily modify some script so that I could maybe build two working plug-ins that would speed up the editing of Gifs for me. Ofnuts ... I use your 'Mirror Layers' plug-in and find it a great help. It was this script that I was hoping to be able to modify so that I could build both a 'Delete Every 2nd Layer' and also a 'Delete All Layers from a specific one' plug-ins which would give me a nice editing suite along with the 'Mirror Layers' for editing Gifs that are processed from videos as there's usually a lot more frames downloaded than are necessary.

Contact me directly (I'm on Gimforums/Gimptalk/Gimpchat) if you need help adapting my scripts (or explain me more in detail what you need).

I have tried out the 'AnimStack' plugin but found that it dosen't perform the Delete functions very well or else I'm just not using it correctly.

Hi, the author of AnimStack here. I would wager the latter option is correct, since it clearly does perform the delete functions, and people other than myself are using it for this specific purpose (i.e. https://sites.google.com/site/taumox/making-animated-gif-image-from-a-video-scene)

Have you watched the video tutorial for this feature? http://www.youtube.com/watch?v=49FGgONSduM&t=7m40s

P.S. Consider learning Scheme/Script-Fu as it's much easier to develop/debug GIMP scripts in it.

On Sun, Nov 11, 2012 at 7:13 PM, Lorgach wrote:

Thanks a lot for the sugestions guys, I'll probably keep pluging away at trying to get some working code as time permits as I'm interested in learning Python.

With one image open, try:

Filters->Python-Fu->Console

Enter:

my_img = gimp.image_list()[0]

Then:

dir(my_img)

Also:

dir(gimp)

I usually have the console open before or during writing a plug-in so I can mess around first. The other window I have open is Help->Procedure Browser.

HTH,
Chris

I had difficulty getting the [delete] tag to work properly... it deletes the first two layers and then every second layer after that.

This is because every layer that has an animstack action tag on it is deleted after processing, this is not something unique to [delete] tag. This is because tagged layers are basically commands, and after being executed they are not needed anymore.

I found that by inserting a duplicate layer of Layer 1 and then changing the name of this to [delete] and then running 'Process AnimStack Tags' I got the desired result of leaving the first one and then deleting every second layer in the list after that.

The intended use-case was that a new empty layer is created tagged with [delete] and placed right before the first layer that is supposed to be deleted. But your way is fine too.