I have tested this example and can confirm this behaviour. I'll make an
upstream bug report. Thank you for reporting this bug to Ubuntu!

** Changed in: gimp (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/884145

Title:
  Gimp destroyes image file when trying to save as .tif with jpeg
  compression

Status in “gimp” package in Ubuntu:
  Confirmed

Bug description:
  To reproduce the bug follow these steps

  1. Start Gimp and open the example-before.tif with LZW compression attached 
below
  2. Go to Image -> Mode -> Indexed, choose "Generate optimum palette -> 
Maximum number of colors", change the value from 256 to 16 and hit "Convert" 
button
  3. Go to File -> Save, replace the file and change compression to jpeg
  4. Now a message appears saying:
  TIFF image Message
  PhotometricInterpretation 3 not allowed for JPEG
  TIFF image Message
  Failed a scanline write on row 0
  GIMP Message
  Saving '/home/myname/example-after.tif' failed:
  TIFF image plug-in could not save image
  5. The file with the image on the disc now has a size of 8 bytes and cannot 
be opened or viewed anymore (see the example-after.tif attached)

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gimp 2.6.11-2ubuntu4
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Mon Oct 31 10:46:37 2011
  EcryptfsInUse: Yes
  InstallationMedia: Xubuntu 10.10 "Maverick Meerkat" - Release amd64 
(20101008.1)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gimp
  UpgradeStatus: Upgraded to oneiric on 2011-10-14 (16 days ago)

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