Custom G'MIC script not working

Software G'MIC
,
1

Hi again, I’m busy trying to build a custom G’MIC command from a script I used with the custom command box:

# plasma rendering and pixelisation followed by random warp with gamma and hue randomisation and final HSV scaling

-fx_plasma 0.5,0,8,1,0,128,128,128

pixel_x={round(u*7.498+3.501)}
pixel_y={round(u*7.498+3.501)}

-samj_Contours_Gros_Pixels 0.5,10,2,{$pixel_x},{$pixel_y},100,1.25,0,0,15,0,0,22,1

f=5 # iterations
i=1 # warp intensity
m=5 # offset magnitude
s=0.25 # gamma
v=1 # hue

hue_min=0
hue_max=5
sat_min=0.5
sat_max=5
val_min=0
val_max=5

-repeat {$f*sign($f)}

a=(u-0.5)*$i
b=(u-0.5)*$i
c=(u-0.5)*$m*sign($m)
d=(u-0.5)*$m*sign($m)
e={round(u)}
f={round((u*2.98)+0.51)}
g={round((u*33.98)-0.49)}
h=(u-0.5)*$s*200
i=(u-0.5)*$v*200

-fx_warp_by_intensity {$a},{$b},{$c},{$d},{$e},0,{$f},{$g},0
-fx_adjust_colors 0,0,{$h},{$i},0,0

-done

j={$hue_min+(u*($hue_max-$hue_min))}
k={$sat_min+(u*($sat_max-$sat_min))}
l={$val_min+(u*($val_max-$val_min))}

-fx_mix_hsv {$j},0,0,{$k},0,0,{$l},0,0,0,2,0
-fx_warp_by_intensity {$a},{$b},{$c},{$d},{$e},0,{$f},{$g},0

Here is my attempt to turn it into a GUI script; my problem is that it’s not showing up in the commands when I place the file in ~/.config/gmic. How can I make it work?

2

Place that code in a file called .gmic - mind the dot - and store that in /home.
If you still have problems, have a look over here, it shows step by step how to create/replicate gmic filters for use in the g’mic gimp plugin:

1 Like
3

That works, although I would’ve liked to create a custom G’MIC file with a custom filename. Now I keep getting syntax errors on anything that isn’t a comment and the error prevents me from running every single other filter. This is a bug with the interpreter.

4

Would you mind sharing your .gmic file, so we can check what is going on ?
What kind of errors do you get ?
I honestly doubt there is a problem with the interpreter at this point, because this has been working for years with maaaaany other filters.

5

First, the error:


Secondly, the file’s already here.

6

Several errors in your file:

  • You forgot to define the start of the command hyperwarpplus, I added it l.30.
  • Your command hyperwarpplus_preview is useless: it is not referenced anywhere, and as you haven’t the preview splitting options in your argument list, there are no ways it can work. I’ve removed it.
  • Your variables $h and $i were not correctly defined (missing braces). Correct syntax should be probably:
h={(u-0.5)*$s*200}
i={(u-0.5)*$v*200}
  • Putting variables between braces is also useless, so things like {$a},{$b} can be replaced by $a,$b.
  • With default parameters, your variable $f is set to 0, which means that the -repeat {$f*sign($f)} loop doesn’t execute a single iteration, which means that variables $g and $h are not assigned to any values, leading to missing parameters in l.149: -fx_warp_by_intensity {$a},{$b},{$c},{$d},{$e},0,{$f},{$g},0. I’ve then replaced the repeat command by this : -repeat {max(1,$f*sign($f))} to ensure at least one iteration of this loop is done. I don’t know if that is something you expect or not, but in any case, defining non-local variables to a loop only inside a loop is probably not recommended at all.

With all these changes, I get a working filter (that looks a bit strange, but I don’t know what it is supposed to do).
Here is the modified file: #@gmic## File : seriously.gmic# ( G'MIC commands fi - Pastebin.com

and a screenshot of the filter running in the plug-in:

1557×801 119 KB

7

Yeah, I realised that {!$x} means a boolean NOT and the loop broke. Here’s the filter working as it should (with a new name), though I reckon I could add some salt-and-pepper noise to make it even more erratic:

1085×577 178 KB

I’ll also add a channel-locking feature in future though I eventually wish to include it as a community filter by making a pull request. That means I’ll need to save it as a named .gmic file, which didn’t work last time.

8

@Joan_Rake1 Looks interesting. What did you have in mind for this filter? Where are you using it?

9

It’s for general use, though I use it to generate extremely-distorted and ‘raw’ textures in a matter of seconds:

800×600 587 KB

800×600 710 KB

800×600 54.3 KB

Those three are on the default settings (with the exception of the plasma texture rendering been turned on). When applied on other images the results are even messier:

I’m not done yet; I’d like to include blurring in addition to channel-locking.

10

Just save the content of your .gmic file as a new file your_name.gmic and I’ll add it to the gmic-community repository, and register it as a new external filter source. So it will appear for everyone after a filter update.

11

Will do; I’ve added the blurring and moved to using quadtree-based ‘pixelisation’. All I need now is to figure out how to lock channels. Can I use channel names instead of numbers when passing it to the warp command?

12

What does channel-locking means precisely ? You want to apply the filter only on some channels ?
If so, I’d suggest you add a parameter Channel(s) in your parameter list and use command -apply_channels (shortcut -ac), as it is already done for other filters.
Should be as simple as adding:

#@gui : sep = separator(), Channel(s) = choice("All","RGBA [all]","RGB [all]","RGB [red]","RGB [green]","RGB [blue]","RGBA [alpha]","Linear RGB [all]","Linear RGB [red]","Linear RGB [green]","Linear RGB [blue]","YCbCr [luminance]","YCbCr [blue-red chrominances]","YCbCr [blue chrominance]","YCbCr [red chrominance]","YCbCr [green chrominance]","Lab [lightness]","Lab [ab-chrominances]","Lab [a-chrominance]","Lab [b-chrominance]","Lch [ch-chrominances]","Lch [c-chrominance]","Lch [h-chrominance]","HSV [hue]","HSV [saturation]","HSV [value]","HSI [intensity]","HSL [lightness]","CMYK [cyan]","CMYK [magenta]","CMYK [yellow]","CMYK [key]","YIQ [luma]","YIQ [chromas]")
#@gui : Value action = choice("None","Cut","Normalize")

and add a new command like that:


fx_hyperwarpplus :
  -ac "-hyperwarpplus $*",$-2,$-1

(and put this new command as the command to execute for the filter).

13

That’s at the end of the filter; what I want is something that sets the channel option right at the -fx_warp_by_intensity command.

Here’s the command as it stands now.

14

All that from the almost default settings: that is pretty cool. The 3rd image is like a Chinese painting of misty mountains and the river that meanders between them.

15

Yeah, it’s pretty good for extreme abstraction; the blurring produces interesting artistic forms. It’s especially good with creating layer masks:

16

The blue/black boxed artifacts look like a tiling issue in algorithm…

17

That’s the work of a layer mask.

18

I had an error but I figured out that it was due to local variables not being transferred. I have no idea why I was talking about a pull request but here’s the script if you wish to add it.

19

Added in Degradations/

1557×801 712 KB

20

Thanks, I might add some more filters soon. I’ll PM you if I do. For now I’ve tried to fix and update UltraWarp++ but the filter broke again without me editing it: