Description:
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imagick::cropThumbnailImage() doesn't resize and crop to the specified size

I'm using the sample image "sunset" provided with windows XP (in My Images) for this code.

When using imagick::cropThumbnailImage(170, 120) the generated image is 160 x 120

Note this is not the case with all the images i have tested.
If I calculate the crop dimensions with php and use imagick::resizeImage() and imagick::cropImage() I'm getting an image of image is 170 x 120

Thanks


Reproduce code:
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$crop1 = new imagick( 'Imagick/sunset.jpg' );
$crop1->cropThumbnailImage( 170, 120 );
$crop1->writeImage( "Imagick/crop_sunset.jpg" );

$crop2 = new imagick( 'Imagick/sunset.jpg' );
$width=170;
$height=120;
//offset calculation
$srcWidth = $crop2->getImageWidth ();
$srcHeight = $crop2->getImageHeight ();
$scaleRatio = max ( $width / $srcWidth, $height / $srcHeight );
$scaleWidth = round ( $srcWidth * $scaleRatio );
$scaleHeight = round ( $srcHeight * $scaleRatio );
$cropOffsetX = ($scaleWidth > $width) ? round ( ($scaleWidth - $width) / 2 ) : 0;
$cropOffsetY = ($scaleHeight > $height) ? round ( ($scaleHeight - $height) / 2 ) : 0;
$cropDimentions = array ($width, $height );
$cropPosition = array ($cropOffsetX, $cropOffsetY );
//resize and crop
$crop2->resizeImage ( $scaleWidth, $scaleHeight, imagick::FILTER_UNDEFINED, 1, true );
$crop2->cropImage ( $cropDimentions [0], $cropDimentions [1], $cropPosition [0], $cropPosition [1] );
$crop2->writeImage( "Imagick/crop2_sunset.jpg" );

Expected result:
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crop1 ouput an image of size 160 x 120

crop2 output an image of size 170 x 120