The processed file has likely been re-imported, but you won't see it if the Lightroom Filmstrip is set to 'Previous Import' (which Lightroom sets this way after you import images from your camera).
If 'Previous Import' shows above the Filmstrip, right-click on it and select All Photographs instead.
You can then click in the Folder where the source images are, if you want to avoid showing your entire catalog after choosing 'All Photographs'.
This error message is normally returned when the location of the photos you selected in Lightroom for export has changed since the time you added these photos to your library.
So, please check whether you had not moved the files of the photos you tried to export. If this is the case, then remove the photos from your Lightroom library and re-import them again. The export to Photomatix Pro will then work normally.
This requires downloading and installing Photomatix Pro as detailed in the installation instructions for the plugin.
If the "Export to Photomatix Pro..." item does not show under "File > Plug-in Extras", this could be due to an installation issue or because Lightroom is looking for plugins somewhere other than where you installed it. The latter could happen if Lightroom was installed by a different user account than the one used to install Photomatix Pro for example, but might also depend on other factors specific to your Lightroom installation.
You can solve the issue by following these steps to install the plugin manually:
Mac OS X: Photomatix.lrplugin zip file for Mac
and unzip the downloaded file if not done automatically.
To use a color space other than the default Adobe RGB color space, please proceed as follows:
The Photomatix Plugin's dialog will then show. The Plugin will export in the color space you have specified on the Export dialog in step 3.
Yes, the Lightroom Plugin included in the current version of Photomatix Pro works fine in Lightroom CC and Lightroom 6.
The installation location of plug-ins did not change between Lightroom 5 and Lightroom CC / 6, which means you should not need to do anything to have the Photomatix Plugin work in Lightroom CC / 6.
Note, though, that if you uninstalled Lightroom 5 and this resulted in removing your Lightroom Plug-ins folder, then you would need to re-install the Photomatix Plugin in this case. The installation instructions are detailed here.
The TIFF files exported by Lightroom to Photomatix Pro are temporary files. They are saved under a folder of your temporary directory, and then deleted by Photomatix Pro once it has processed them.
The default conversion of a raw file to DNG does not change the "raw" nature of the file. For Photomatix, a DNG file is still a raw file, and Photomatix will need to convert it before HDR processing.
The RAW conversion in Photomatix is slower and much less sophisticated than the conversion/rendering done in Lightroom. This is why it is better to have Lightroom convert the DNG files to TIFF when exporting to Photomatix rather than letting Photomatix do the conversion itself. In fact, the main benefit of using the Photomatix Plugin for Lightroom is precisely the ability to have Lightroom automatically convert the raw/dng files to TIFF prior to processing in Photomatix.
Yes, the Photomatix Plugin for Lightroom works fine in Lightroom run in 64-bit mode.
The simplest way is to just download and install Photomatix Pro for Windows again, making sure that the box "Yes, install the Lightroom Plugin" is checked during the installation process.
Re-installing Photomatix Pro will do no harm, but we still recommend that you first uninstall Photomatix Pro (by using the control panel) before installing again. Note that you will have to close Photomatix in case it is open when you are re-installing it, otherwise the installation will report an error.
If you prefer to install the Plugin alone, then you can do this by installing the Plugin manually.
The current version of the Plugin is supposed to work in Lightroom 1.3 and 1.4, but with the automatic reimport option disabled as this only works with Lightroom 2.