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Bug #58747 setImageChannelDepth does not work
Submitted: 2009-07-02 09:14 UTC Modified: 2009-07-24 08:47 UTC
From: me at reso dot od dot ua Assigned:
Status: Not a bug Package: imagick (PECL)
PHP Version: 5.2.9 OS: Ubuntu 8.04
Private report: No CVE-ID: None
 [2009-07-02 09:14 UTC] me at reso dot od dot ua
setImageChannelDepth seems to have no effect on the image. I 
have also tried converting the image to grayscale with $img-
>setImageColorspace(imagick::COLORSPACE_GRAY); but it had no 
effect either.

Reproduce code:

$img = new Imagick("./test.jpg");
$img->setImageChannelDepth(imagick::CHANNEL_RED, 0);
$img->setImageChannelDepth(imagick::CHANNEL_GREEN, 0);
header("Content-type: image/jpeg");
echo $img;



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 [2009-07-02 09:16 UTC]
What are you trying to achieve? Create grayscale image?
 [2009-07-02 09:24 UTC] me at reso dot od dot ua
There are two different things, really:

1) By distracting red and green channel I wanted to work 
only with the blue one. The strange thing is that it did 
work on the older versions of imagick.

2) With setImageColorspace(imagick::COLORSPACE_GRAY); I 
wanted to create a grayscale image to use it with clutImage. 
getImageColorspace reports that the colorspace is GRAY, but 
still displays and RGB image.
 [2009-07-02 18:15 UTC]
Can you specify your ImageMagick version as well?
 [2009-07-02 18:27 UTC] me at reso dot od dot ua
ImageMagick 6.5.3-10 2009-06-23 Q16 OpenMP compiled with GCC 
 [2009-07-24 08:47 UTC]
Sorry, but your problem does not imply a bug in PECL itself.  For a
list of more appropriate places to ask for help using PECL, please
visit as this bug system is not the
appropriate forum for asking support questions. 

Thank you for your interest in PECL.
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