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 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gimp in Ubuntu. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/884145/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp