The code and .DLLs are here, just copy-paste all the scripts and .DLLs into your Powder Toy folder.

To use, press 'j' to start, and then enter the file name and the frame rate of the GIF.

To end it, press control-j. Once you've made it, you have to restart TPT to make another.

There's supposed to be a GIF above this text, but it's not showing up for me. I'll fix that soon. 

Version:

     1.0:

     First created

     1.5:

     Allow for multiple gifs to be recorded in one session without restart

     Removed unneeded code

Planned in next version:

     Better GUI, more customizable features

     Allow multiple recordings without having to restart

     Looping

Current version of script:

require 'gd'

gif = gif or {}

local im = gd.createTrueColor(610, 380)

local scnum = 0

local capt

function gif.control(a, b, c, d)
    if a == 'j' and not(c == 64) then
        capt = true
        gif.current = tpt.input('GIF name', 'Enter the GIF filename here.') .. '.gif'
        gif.speed = 100 / tonumber(tpt.input('GIF Speed', 'In FPS', '30'))
        im:gifAnimBegin(gif.current, false, 10000)
        tpt.register_step(gif.capture)
    elseif a == 'j' and c == 64 then
        capt = nil
        im:gifAnimEnd(gif.current)
        tpt.unregister_step(gif.capture)
    end
end

tpt.register_keypress(gif.control)

function gif.capture()
    if capt then
        tpt.screenshot()
        im, errstr = gd.createFromPng(("screenshot_%06d"):format(scnum) .. '.png')
        if im then im:gifAnimAdd(gif.current, true, 0, 0, gif.speed, gd.DISPOSAL_NONE) end
        os.remove(("screenshot_%06d"):format(scnum) .. '.png')
        scnum = scnum + 1
    end
end


I don't really care about errstr being global, although your second suggestion actually makes sense.

Meh. This works exactly the same.

And why are you always hypercritical of my scripts? THere are much worse ones out there, and mine, while not written as well as they could be, actually work quite well.