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ofn-scroll-layer
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A small script to generate animations by shifting a layer.
![[Image: TNn94Sm.gif]](https://i.imgur.com/TNn94Sm.gif) ofn-scroll-layer is available here. Please read the HTML doc and its magnificent example. 
First again :-)
![[Image: url]]](https://i.imgur.com/d68vYMt.gif[/url]) I was unable to configure the script correctly; I haven't read the manual yet, I just read it quickly.  So I didn't know how to limit it to 60 layers, and the script generated an infinite number of layers.  I had to work around the situation manually. But ok, it was just to try the script.  Sunday night or Monday, I will have time to experiment with the script again. à bientôt
04-18-2020, 12:16 AM
The manual explains in detail why in some cases you get a huge number of copies. That number of copies has to be a common multiple of the H and V cycles, and the H and V cycles are each a common multiple of the step and the layer dimension. So with random number things can get big.
04-18-2020, 10:29 AM
Added support for tiled layers, which can reduce the size of the animation.
04-23-2020, 06:52 PM
I was playing with this script and as much as I tried different configurations, the result was always a non-constant animation.
I varied the number of steps, created a seamless layer, etc. I always got an oscillating gif, as if it stuck in some parts. So I saved the .xcf and decided to check with version 2.10.18 and voilà. In summary, at least with my Samj portable version 2.10.12 I was unable to generate results with continuous transitions and without bumps. With version Samj's Portable 2.10.18 I didn't have a single problem of this type.
04-23-2020, 08:11 PM
There should be no jumps if your layer is seamless, and I don't thing the Gimp version comes into play. Otherwise please share the XCF (before the animation is generated).
05-04-2020, 04:15 PM
[attachment=4316 Wrote:Ofnuts pid='17813' dateline='1587672701']There should be no jumps if your layer is seamless, and I don't thing the Gimp version comes into play. Otherwise please share the XCF (before the animation is generated).►With Gimp 2.10.12 Samj Portable ![[Image: url]]](https://i.imgur.com/fVTatvQ.gif[/url]) ►With Gimp 2.10.18 Samj Portable ![[Image: o6OxjTV.gif]](https://i.imgur.com/o6OxjTV.gif)
Taking both pictures, exporting all layers as TGA (PNG includes a timestamp so identical images would produce different files), then taking the MD5 of each file for easy comparison:
Code: 0981e9b9c99ce32ba7f0fa516792240a 09-Bubbles-Hang.tga
And of course, I find these identical frames in the pre-animation version your posted. But I still have a very hard time believing that this would be due to the version of Gimp... Do you have the same problem with different steps (-4,-5,-6,-12)?
I used the same .xcf to generate both animations.
After applying the scroll-layer + interleave layers and generating the animation 01 (Gimp 2.10.12), I opened the .xcf in Gimp 2.10.18, deleted the layers created with the scroll-layers in gimp 2.10.12 and created new layers this time using the scroll-layer with gimp 2.10.18 and then applying the interleave layers. In common both versions had two initial layers: 001 copy Base 
ScrollLayerReady.xcf (Size: 670.03 KB / Downloads: 239)
- Scroll-layer With 2.10.12
ScrollLayerReady21018.xcf (Size: 669.98 KB / Downloads: 235)
- Scroll-layer With 2.10.18(05-04-2020, 08:59 PM)Ofnuts Wrote: Taking both pictures, exporting all layers as TGA (PNG includes a timestamp so identical images would produce different files), then taking the MD5 of each file for easy comparison:Sorry, I don't understand what steps that would be (-4, -5, -6, -12). (Some minutes after...) Oops ... do you say steps in the scroll-layer script? (horizontal and vertical) I haven't touched it again for maybe 10 days, but vaguely I remember that I tried several steps and usually always gave this problem, but I have a vague reminder that when the number of layers was quite large I didn't notice the oscillation (dysrhythmia / jumping ) in the animation. |
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