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ofn-scroll-layer
#1
A small script to generate animations by shifting a layer.

[Image: TNn94Sm.gif]

ofn-scroll-layer is available here. Please read the HTML doc and its magnificent example.
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#2
First again :-)
[Image: url]]
I was unable to configure the script correctly; I haven't read the manual yet, I just read it quickly.  Blush

So I didn't know how to limit it to 60 layers, and the script generated an infinite number of layers.  Sad 

I had to work around the situation manually. But ok, it was just to try the script.  Rolleyes

Sunday night or Monday, I will have time to experiment with the script again. à bientôt
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#3
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.
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#4
Added support for tiled layers, which can reduce the size of the animation.
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#5
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.
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#6
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).
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#7
[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]]

►With Gimp 2.10.18 Samj Portable
[Image: o6OxjTV.gif]


Attached Files
.xcf   ScrollLayerBase.xcf (Size: 670.17 KB / Downloads: 44)
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#8
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
14a498cd0891c46775ddc1f538111aa9  07-Bubbles-Hang.tga
211d1cd0e80f57ceb8f61bacd525c91f  20-Bubbles-Good.tga
222cbc680d1721821baadefae4125da8  08-Bubbles-Hang.tga
2277462fd382d3b5f958759c81cfe991  23-Bubbles-Hang.tga
22b82ca4f07f70bb6e4f54c03c4a0af0  22-Bubbles-Hang.tga
25d86d9b715ec0a51eacd6ac88ddfeb4  19-Bubbles-Good.tga
25eaac3f2c64e3d288ea3a4aa2bb04b3  16-Bubbles-Good.tga
28668af46bc1500e3c2a2dc155898fd3  18-Bubbles-Good.tga
3aa4363ad8574fcf0ff37515365364c9  06-Bubbles-Hang.tga
3fea529f6ddbf97b70c6b2b42fb538e3  03-Bubbles-Good.tga
4044e71b8a4c944eaa3f559cd889f43a  05-Bubbles-Hang.tga
44627b1c64a6d7f53c76623760939816  06-Bubbles-Good.tga
4f27f0055600bf7a405ec74c7514cf14  10-Bubbles-Hang.tga
5495126d0eaf5f0261e8cc5adf71b275  27-Bubbles-Hang.tga
5a7a40de36d62d8ecc4bd3d0d3cbaf75  25-Bubbles-Hang.tga
5fe3e6240132d1cad6c607b1320c3862  28-Bubbles-Good.tga
602b1c1adb7f7a801dcfe57f7205602c  23-Bubbles-Good.tga
6352efd8e1a04084fb1198fbb6d42226  21-Bubbles-Good.tga
71dc847b20fbd1a98407e7b77352be24  26-Bubbles-Good.tga
784d430f1281a38239711ed46d12bf15  01-Bubbles-Good.tga
7a5225d5446b896fc8ab682c2de1a2ba  13-Bubbles-Good.tga
80a23d8a245af40f7943d6bd5e66c8dc  12-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  01-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  02-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  03-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  14-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  15-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  16-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  17-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  18-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  29-Bubbles-Hang.tga
82b06ae8bfa37a0c3cbfc34e5c75a64b  30-Bubbles-Hang.tga
83ca2c93ce356566c222a11da678bf4d  17-Bubbles-Good.tga
84ffdb2d336c31e6b572c4f3c481248e  08-Bubbles-Good.tga
89b9f28ab1d42c4e1e6faf448f2c52b5  21-Bubbles-Hang.tga
89c1bb5a2e62a1b61c83e55e36b11e7e  29-Bubbles-Good.tga
8a3563aab091466e89b3cb4bca958fbc  15-Bubbles-Good.tga
8dd10c57464fb43a6d82769e7464f451  14-Bubbles-Good.tga
8e9fa09ea20dcdc6f7184067ac9ca20f  26-Bubbles-Hang.tga
93a124d77710a832278b9ad7e6f58a54  27-Bubbles-Good.tga
99bb216a0b47e27e3ed85e9528e974c6  22-Bubbles-Good.tga
9ef8723e92cd2f2259e46fd2f213e518  24-Bubbles-Hang.tga
b67178f5cf6703d56e68a5590582445d  11-Bubbles-Good.tga
b87fdc07fcf0b3300a953f468a41cdbd  09-Bubbles-Good.tga
be62c80f378ff1c6bac5b5d4f63e3eed  12-Bubbles-Good.tga
c0308625397211d689a6123e1c53481a  30-Bubbles-Good.tga
c1b58be3d9423a1248e1df7a285f08e9  04-Bubbles-Good.tga
c5c1a9fe6e30e9eba7c3921791956864  02-Bubbles-Good.tga
c7052aa6d96d59c4e85cf0291aea7663  13-Bubbles-Hang.tga
d0db97ecbdf742fc13e4f63e709cb979  19-Bubbles-Hang.tga
d17f0b67e8d82dbebf1ff8d1f6c06db7  28-Bubbles-Hang.tga
d43d58cd973e39ef4e29734d629fae7d  07-Bubbles-Good.tga
e11f28f3b91daa8536fdad36c68fa8be  05-Bubbles-Good.tga
e1d7e0dccd9e66d01cd4a737b6861559  24-Bubbles-Good.tga
e2d27aeae44653280dbb03f9a01a0632  04-Bubbles-Hang.tga
f2c363c2ab875b2038877cca87d3fb97  20-Bubbles-Hang.tga
f7f2bc2c35f0f6f863c5ffe065f8ad82  25-Bubbles-Good.tga
fabe2134607ee1de35ac3c70c55f3473  11-Bubbles-Hang.tga
ff1a4d1ffc951ca8475fa6696507d750  10-Bubbles-Good.tga
So you have several clusters of files where the image is the same which is why you have this choppy  animation. To be accurate you have two 5-frames breaks:
  • 14-15-16-17-18
  • 29-30-01-02-03
They are spaced exactly 15 frames apart...  

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)?
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#9
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

.xcf   ScrollLayerReady.xcf (Size: 670.03 KB / Downloads: 52) - Scroll-layer With 2.10.12


.xcf   ScrollLayerReady21018.xcf (Size: 669.98 KB / Downloads: 58) - 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:

Code:
...
So you have several clusters of files where the image is the same which is why you have this choppy  animation. To be accurate you have two 5-frames breaks:
  • 14-15-16-17-18
  • 29-30-01-02-03
They are spaced exactly 15 frames apart...  

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)?
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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#10
The problem is visible as soon as your generate the scroll. The identical frames reinforce their image  and there are also visible gaps in the "smear".

   
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