[TYPO3-english] typo3 + imagemagick + scaling of alpha transparent pngs

[David Bruchmann]

----- Ursprüngliche Nachricht -----
Von:        horace grant <horace3d at gmail.com>
Gesendet:   Freitag, 20. August 2010 16:46:44
An:         TYPO3 English <typo3-english at lists.typo3.org>
Betreff:    Re: [TYPO3-english] typo3 + imagemagick + scaling of alpha 
transparent pngs

> i don't use any special typoscript for scaling images. i mean the
> standard content element image scaling behaviour of typo3.
>
> i noticed that my hoster seems to use graphicsmagick:
>
>
>
> Current configuration
>
> GraphicsMagick enabled:
>      1
> GraphicsMagick path:
>      /usr/bin/ (1.1.11)
> GraphicsMagick path/LZW:
>      /usr/bin/ (6.3.7)
> Version 5/GraphicsMagick flag:
>      gm
>
> GDLib enabled:
>      1
> GDLib using PNG:
>
> IM5 effects enabled:
>      -1 (Blurring/Sharpening with IM 5+)
> Freetype DPI:
>      96 (Should be 96 for Freetype 2)
> Mask invert:
>      0 (Should be set for some IM versions approx. 5.4+)
>
> File Formats:
>      gif,jpg,jpeg,tif,tiff,bmp,pcx,tga,png,pdf,ai
>
>
>
> could this be the reason? all the other image manipulation features
> work great though.
>
> i can't post an example of the images since my client probably
> wouldn't like that. but they look kind of distorted (like the rows and
> columns of pixels get messed up because the alpha byte gets
> interpreted wrongly) and the resulting transparency is 0/1
> transparency instead of alpha transparency.
>

Hi Horace,

ok, here are my settings for IM:

$TYPO3_CONF_VARS['GFX']["im"] = '1';
$TYPO3_CONF_VARS["GFX"]["im_negate_mask"] = '1';
$TYPO3_CONF_VARS["GFX"]["im_imvMaskState"] = '0';
$TYPO3_CONF_VARS["GFX"]["im_v5effects"]='1';
$TYPO3_CONF_VARS["GFX"]["im_combine_filename"] = 'composite';
$TYPO3_CONF_VARS["GFX"]["im_version_5"] = '1';
$TYPO3_CONF_VARS["GFX"]["im_path"] = 'N:\ImageMagick-6.3.7-Q16\\';
$TYPO3_CONF_VARS["GFX"]["im_path_lzw"] = 'N:\ImageMagick-6.3.7-Q16\\';

$TYPO3_CONF_VARS["GFX"]["im_jpg_quality"] = '96';
$TYPO3_CONF_VARS["GFX"]["TTFdpi"] = '96';
$TYPO3_CONF_VARS["GFX"]["gdlib_png"] = '1';
$TYPO3_CONF_VARS["GFX"]["gdlib_2"]='1';
$TYPO3_CONF_VARS["GFX"]["im_mask_temp_ext_gif"] = '0';
$TYPO3_CONF_VARS["GFX"]["thumbnails_png"] = '1';

Just saw the post from Jigal that alpha-transparency still doesn't work 
in TYPO3 but I'd try to set at least the last 6 lines too, suppose it 
will improve your results in general.

Greets,
David