TYPO3 Core

This works in TYPO3 core's standard tt_content element, but usually gets miss-configured for the custom records. You need to specify rtehtmlarea_images in the softref configuration. Sample:

    'exclude' => 1,
    'label' => 'LLL:EXT:ed_travel/Resources/Private/Language/locallang_db.xlf:tx_edtravel_domain_model_poi.description',
    'config' => array(
        'type' => 'text',
        'cols' => 40,
        'rows' => 15,
        'eval' => 'trim',
        'wizards' => array(
            'RTE' => array(
                'icon' => 'wizard_rte2.gif',
                'notNewRecords'=> 1,
                'RTEonly' => 1,
                'script' => 'wizard_rte.php',
                'title' => 'LLL:EXT:cms/locallang_ttc.:bodytext.W.RTE',
                'type' => 'script'
            )
        ),
        'softref' => 'rtehtmlarea_images,typolink_tag,images,email[subst],url',
    ),

There's one bug though, when you try to delete an image which is referenced in RTE, the list of records which reference it will not display the ones with references from RTE:

I will push patch to gerrit tomorrow...

Patch set 1 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/32412

Applied in changeset e26961c87c9cca07b7fa7c2b0a924e06dc9a09aa.