how do I split animated gif frames into individual gif files

[JinxsDad]

I need to split GOES EAST satellite imagery (the loop) animated gifs into
individual frames that my JStrack users (regardless of platform) can run
using a pure Tcl/Tk alternative to Img. I seem to remember hos to do
this, two decades and two cancers ago, but not anymore.

I do remember that it was fairly simple, but that's it. I don't even
remember where to start. I DO remember that once I had the individual
frames, I used a while loop with sleep to create the proper frame rate
for cycling through the gif frames.

Any assistance in help my cancer nuked brain remember how I split those
gifs without Img, please let me know.

Thanks,
--jim

[Harald Oehlmann]

Dear Jim,
thank you for the question.
You have the -index option to get a particular image from an animated gif.
So:
image create photo myphoto -file ani.gif -format "gif -index 1"

Will return the 2nd image in the gif file.

Remark that with Tk 9.0, you get the animation parameters in the
metadata property.

Thake care,
Harald

Post by JinxsDad
I need to split GOES EAST satellite imagery (the loop) animated gifs into
individual frames that my JStrack users (regardless of platform) can run
using a pure Tcl/Tk alternative to Img. I seem to remember hos to do
this, two decades and two cancers ago, but not anymore.
I do remember that it was fairly simple, but that's it. I don't even
remember where to start. I DO remember that once I had the individual
frames, I used a while loop with sleep to create the proper frame rate
for cycling through the gif frames.
Any assistance in help my cancer nuked brain remember how I split those
gifs without Img, please let me know.
Thanks,
--jim

[JinxsDad]

Post by JinxsDad
I need to split GOES EAST satellite imagery (the loop) animated gifs into
individual frames that my JStrack users (regardless of platform) can run
using a pure Tcl/Tk alternative to Img.

A new search string slipped past my chemobrain this morning:
"animated gif tcl/tk". It worked. I found anigif.tcl by
Ryan Casey at https://cardtable.sourceforge.net/tcltk/

It looks like a simple package I can just slip right into JStrack
(with credit, obviously). And it will work---I just finished
testing it. All I need to do is get the actual size of the image
from GOES EAST and set the height/width of the label widget it
uses to the satellite image's dimensions.

So thanks anyways, but this seems to have solved itself once
chemobrain let one get away. :-)

Thanks,
--jim