Imagick results in negative image while using imagick::profileImage - php

Question

I m using PHP's Imagick extension to manipulate images. Following are my code
try{
$sourceimg=dirname(__FILE__)."\\source.jpg";
$destinationimg=dirname(__FILE__)."\\source_cmyk.tiff";
$im=new Imagick();
$im->setResolution(300,300);
$im->readImage($sourceimg);
$im->setImageColorSpace(imagick::COLORSPACE_CMYK);
$im->stripImage();
$cmykprofile=#file_get_contents("C:\\USWebUncoated.icc");
$im->profileImage("icm",$cmykprofile);
$im->setImageDepth(8);
$im->setImageUnits(1); //0=undefined, 1=pixelsperInch, 2=PixelsPerCentimeter
$im->setResolution(300,300); //set output resolution to 300 dpi
$im->setImageCompressionQuality(100);
$im->writeImage($destinationimg);
}catch(ImagickException $e){
echo $e->getMessage();
}
The problem i m having is the code negates the original Image. This issue occurs only if i use $im->profileImage. What will be the cause for this? And how to solve this issue? The profile i m using is cmyk color profile that i downloaded from http://www.adobe.com/support/downloads/detail.jsp?ftpID=3680
Any help will be highly appreciated.
Thanks

Answer 1

If you're using images with specialized color profiles or non-RGB images (e.g. CMYK JPEG), you should convert them to sRGB first.
With striping profile you strip ICC color profile as well. Most browsers display your stripped image with gamma 2.2 (default), which differs from CMYK.
Solution of your problem is in user contributed note here: http://www.php.net/manual/en/imagick.setimagecolorspace.php