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Bug #56134 imagick_transformrgb does not work with ImageMagick 5.5.7
Submitted: 2004-07-16 05:25 UTC Modified: 2013-12-03 11:38 UTC
From: k at ailis dot de Assigned:
Status: Not a bug Package: imagick (PECL)
PHP Version: 4.3.3 OS: Debian GNU/Linux 3.0
Private report: No CVE-ID: None
 [2004-07-16 05:25 UTC] k at ailis dot de
The imagick_transformrgb function is not working with ImageMagick (at least not with 5.5.7). If I want to convert a CMYK JPEG into RGB it simply does nothing. The result is still a CMYK JPEG. But with GraphicsMagick (1.1.2) it works.

Instead ImageMagick's SetImageColorSpace function works so it may be useful to switch to this function. But this function does not work with GraphicsMagick 1.1.2 (Compiles fine but results in a segfault). So a compiler switch may be needed.

SetImageColorSpace has exactly the same syntax as the TransformRGB function.

I'm not fit enough in API issues of ImageMagick/GraphicsMagick so I have no idea if it is a good thing to have a imagick_transformrgb() function which calls the ImageMagick's SetImageColorSpace function. Maybe it's better to have a imagick_setcolorspace function (which would be intuitiv because there is already an imagick_getcolorspace function).

Reproduce code:
$handle = imagick_readimage('cmyk.jpeg');

imagick_transformrgb($handle, IMAGICK_COLORSPACE_RGB);

imagick_writeimage($handle, 'rgb.jpeg');

Expected result:
A rgb.jpeg with RGB colorspace

Actual result:
A rgb.jpeg with untouched CMYK colorspace


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 [2004-12-30 16:56 UTC] bondu at iowalab dot com
Perlmagick has the same problem:

Adding a method for imagemagick's Transformcolorspace should fix this.   The sentax is the same as TransformRGBImage

something like:
PHP_FUNCTION( imagick_transformcolorspace )
        zval*      handle_id ;          /* the handle identifier coming from
                                           the PHP environment */
        long       colorspace ;         /* the colorspace to transform the
                                           image to */
        imagick_t* handle ;             /* the actual imagick_t struct for the
                                           handle */
        if ( zend_parse_parameters( ZEND_NUM_ARGS() TSRMLS_CC, "rl",
                        &handle_id, &colorspace ) == FAILURE )
                return ;
        handle = _php_imagick_get_handle_struct_from_list( &handle_id TSRMLS_CC ) ;
        if ( !handle )
                php_error( E_WARNING, "%s(): handle is invalid",
                           get_active_function_name( TSRMLS_C ) ) ;
                RETURN_FALSE ;
        _php_imagick_clear_errors( handle ) ;
        TransformColorspace( handle->image, ( ColorspaceType )colorspace ) ;
        if ( _php_imagick_is_error( handle ) )
                RETURN_FALSE ;
        RETURN_TRUE ;
 [2013-12-03 11:38 UTC]
-Status: Open +Status: Not a bug
 [2013-12-03 11:38 UTC]
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