Problem with Thermal images using Tomas123's script

[sebastianbarria]

Hi everyone.
I'm new in this forum.

I'm trying to process thermal images using Tomas123's script posted originally on exiftool's forum.
For years, everything works fine... but yesterday there was a set of images that doesn't process correctly.

I've been debugging and it seems that the IR image is not being well generated, since the rawThermalImage inside the original file is in TIFF format and not in PNG.
Even the script itself has an IF to verify if it's PNG or TIFF format, the final result is a flat image with the last color of the palette on each pixel.

It looks to be something with the convert command, but I'm not that expert and I'm not what could be wrong.
I know the image are ok, because when I open it on BFIC software, it looks fine.

In case someone could help me, I'm attaching the files:
IRX_0001.jpg (original thermal image)
flir.zip (Tomas123 original php script)

Thanks a lot!