[PHP-NOTES] note 130495 added to imagick.profileimage

Instantiating an image files, and attempting to save them in PNG format using setImageFormat('PNG'), I occasionally encountered
"gd-png: libpng warning: iCCP: profile 'icc': 'CMYK': invalid ICC profile color space".

However, transformimagecolorspace( \Imagick::COLORSPACE_SRGB ) had not effect, because getImageColorspace() did not indicate COLORSPACE_CMYK.

Instead, one has to check for the presence of any ICC profile,  inspect the ICC profile header (offset 16) for the "CMYK" color space tag, and then remove the ICC profile:

$ICC_count = remove_ICC( $image, 'CMYK');

function remove_ICC( \Imagick $image, ?string $colorspace ): int
{
    $icc_count = 0;
    
    foreach ( $image->getImageProfiles( 'icc' ) as $name => $profile ) {
        if ( empty( $colorspace ) or 0 === strcasecmp( $colorspace, substr( $profile, 16, 4 ) ) )
            // Either consider all ICC profiles, or just those matching the color space.
            $icc_count++;
    }
    
    if ( $icc_count > 0 )
        $image->profileImage( 'icc', null );        // Delete any ICC profiles.
        
        return $icc_count;
}
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