[cross-platform] Gimp python plugin to bring image near OCS color resolution

[alkis]

I've hacked this plugin this evening

https://github.com/alexalkis/palette_amigaOCS

Only tested on linux.

[Vousti]

A better tool already exists...

http://mrsebe.bplaced.net/blog/wordpress/?page_id=374

[alkis]

Any sample image that demonstrates that? Or was it a faith statement?

[Amiga1992]

I guess both things are different. This script does not do HAM stuff (HAM is not straight bitplane conversion), but it's a handy way for people who use GIMP to convert images to Amiga-friendly formats.

Personally I use a combination of tools. XnView also does a decent job of color reduction with different dithering and exporting to IFF. It'sa good, cross-platform option, super fast and with a small footprint.

[alkis]

It's handy to have in a paint program cause you can do modifications to fix things. Anyways, I needed an approximation of how it would look in OCS.

[Vousti]

ham_convert does much more than just HAM stuff. Just check the link and don't make prejudicious comments. And last but not least, try the software yourself!

[alkis]

Huh? What prejudicious comments? It was a honest question, do you have a sample image that shows what you are stating or are you saying something on faith?

[Vousti]

Originally Posted by alkis

Huh? What prejudicious comments? It was a honest question, do you have a sample image that shows what you are stating or are you saying something on faith?

I have tested the software and the results were convincing.
It's Java software so few people may not want to use it.

You should try the software yourself, I'm not going to generate any previews...

[alkis]

Ok, I'll try it. Thanks for the link, btw.

[Vousti]

Atkinson dithering is probably the best. Palette generation modes 0-7 will help remove color artifacts.

[malko]

Does anyone managed to make it working with Gimp 2.8 on Windows ?
Tried in both plug-in folders* but nothing appears in the menu EVEN if I can see the filename when the application start...

*edit -> settings -> folders -> plug-in,
%USERPROFILE%\.gimp-2.8\plug-ins
%ProgramFiles%\GIMP2\lib\gimp\2.0\plug-ins

[alkis]

Originally Posted by malko

Does anyone managed to make it working with Gimp 2.8 on Windows ?
Tried in both plug-in folders* but nothing appears in the menu EVEN if I can see the filename when the application start...

*edit -> settings -> folders -> plug-in,
%USERPROFILE%\.gimp-2.8\plug-ins
%ProgramFiles%\GIMP2\lib\gimp\2.0\plug-ins

Hmmm, works for me on clean 2.8.22 install if I copy the .py file in C:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins

(Windows 10/64 bit)

[alkis]

Originally Posted by malko

Does anyone managed to make it working with Gimp 2.8 on Windows ?
Tried in both plug-in folders* but nothing appears in the menu EVEN if I can see the filename when the application start...

*edit -> settings -> folders -> plug-in,
%USERPROFILE%\.gimp-2.8\plug-ins
%ProgramFiles%\GIMP2\lib\gimp\2.0\plug-ins

Hmm, can you edit with a text editor the script and change (near the bottom of the file)
menu="<Image>/Filters/Render"
to
menu="<Image>/Filtres/Rendu"

Second hmm, try changing it to cause it wouldn't make any sense to go with the first replacement
menu=N_("<Image>/Filters/Render")

[malko]

Originally Posted by alkis

Hmm, can you edit with a text editor the script and change (near the bottom of the file)

menu="<Image>/Filters/Render"
to
menu="<Image>/Filtres/Rendu"

Second hmm, try changing it to cause it wouldn't make any sense to go with the first replacement

menu=N_("<Image>/Filters/Render")

I opened the file with Programmer's Notepad (has a syntax add-in for python).
A search on "Filters/" returned only one occurrence in line 970 !
Line 970 ? I thought your script was smaller....
So I had a look again in github. Script has 122 lines... So what happened ???

After looking a bit I understood what happened.
When downloading your file, I right-clicked on the palette_amigaOCS.py file to "save as...". Bad idea .
So I deleted the file on my system and clicked on "Clone or download" in github, got the zip file and extracted it.

Now the palette_amigaOCS.py on my system has 122 lines .
Ok re-loaded Gimp... drum roll... No, no entry in Filter/Render menu .

Changed the entry as proposed :
menu=N_("<Image>/Filters/Render") -> menu=N_("<Image>/Filtres/Rendu"))
Re-loaded Gimp... drum roll... No, no entry in Filter/Render menu BUT a new menu "Filtres" is present and has a "Rendu" sub-menu . (see first thumbnail)

I then opened another Gimp plug-in to see how the menu line is written. I opened the file foggify.py . It is written as : menu="<Image>/Filters/Render/Clouds",.
So I changed the menu line as : menu="<Image>/Filters/Render" (in English) and re-loaded Gimp... drum roll... No, still not here
Tried the option to re-load the scripts-fu... waited 15 seconds... drum roll... YES !!! finally it's here ! . And stay there each time I launch Gimp . (see second thumbnail)

So to sum up on my config (French Gimp) for your plug-in to be displayed where you expected it : "/Filters/Render" has to be kept in English, no "N_(" notation, and re-load of the script-fu used.

With all of this, I still haven't tested your plug-in... !

Edit: When re-reading my post I noticed a misprint in the screenshot... Who will see it ?

[alkis]

cool, thanks for all the combinations you tried!

Updated the plugin on repository, according to feedback!

[malko]

You are welcome

PS: If you have a Gimp plug-in to create Amiga Icons, it's with pleasure

[malko]

Just a feedback to say that the plug-in is also working with latest GIMP (2.10.18)

[malko]

Still works with latest GIMP 2.10.32.

[rothers]

Do you plan to add HAM support? It would very much help me with my HAM game.

[alkis]

Originally Posted by rothers

Do you plan to add HAM support? It would very much help me with my HAM game.

Ham needs other kind of logic from current implementation. I'll look into it, but no promises.