[TYPO3-german] Transparente PNG's

[lixx]

hallo leute!

ich verwende MAMP 1.8.3 und TYPO3 4.3.0 und möchte 24-bit-pngs einfügen. 
allerdings werden mir diese nicht angezeigt. im install-tool gibt es 
auch probleme png-bilder zu lesen. hat damit jemand erfahrung? 
recherchiere seit gestern erfolglos. liegt es an MAMP oder an der config?

$TYPO3_CONF_VARS['GFX']['im'] = '1';	//  Modified or inserted by TYPO3 
Install Tool.
$TYPO3_CONF_VARS['GFX']['im_version_5'] = 'im5';	//  Modified or 
inserted by TYPO3 Install Tool.
$TYPO3_CONF_VARS['GFX']['im_combine_filename'] = 'composite';	// 
Modified or inserted by TYPO3 Install Tool.
$TYPO3_CONF_VARS['GFX']['im_path'] = '/opt/local/bin/';	//  Modified or 
inserted by TYPO3 Install Tool.
$TYPO3_CONF_VARS['GFX']['im_path_lzw'] = '';	//  Modified or inserted by 
TYPO3 Install Tool.
$TYPO3_CONF_VARS['GFX']['gdlib_2'] = '1';	//  Modified or inserted by 
TYPO3 Install Tool.
$TYPO3_CONF_VARS['GFX']['gdlib_png'] = '0';	//  Modified or inserted by 
TYPO3 Install Tool.
$TYPO3_CONF_VARS['GFX']['png_truecolor'] = '1';	//  Modified or inserted 
by TYPO3 Install Tool.

lg arno