Overlaying image from string.

[s0l1dsnak3123]

Hi there, I have almost successfully overlayed an image from a string onto an image dynamically retrieved from a database, and making white in the overlay image transparent. One problem though: the resulting image has a little white halo as seen below.

 

 

No matter what I've tried, I have not been able to get rid of those damn white halos... Here is the code I am using:

 

function WatermarkImage( $CanvasImage, $WatermarkImageLink /* MUST BE PNG */, $SaveFilePath, $Opacity = 10, $Quality = 75 )
    {
            // create true color canvas image:
            $canvas_src = @imagecreatefromjpeg( $CanvasImage ) or $canvas_src = @imagecreatefrompng( $CanvasImage ) or // or PNG Image
            // or GIF Image
            $canvas_src = @imagecreatefromgif( $CanvasImage );
            $canvas_w = imagesx( $canvas_src );
            $canvas_h = imagesy( $canvas_src );
            $canvas_img = imagecreatetruecolor( $canvas_w, $canvas_h );
            imagecopy( $canvas_img, $canvas_src, 0, 0, 0, 0, $canvas_w, $canvas_h );
            // no longer needed
            imagedestroy( $canvas_src );

            // create true color overlay image:
            $overlay_src = imagecreatefromstring( $WatermarkImageLink );
            $overlay_w = imagesx( $overlay_src );
            $overlay_h = imagesy( $overlay_src );

            $overlay_img = imagecreatetruecolor( $overlay_w, $overlay_h );
            imagecopy( $overlay_img, $overlay_src, 0, 0, 0, 0, $overlay_w, $overlay_h );
            // no longer needed
            imagedestroy( $overlay_src );

            //imagealphablending( $overlay_img, false );
            // setup transparent color (pick one):
            $black = imagecolorallocate( $overlay_img, 0x00, 0x00, 0x00 );
            $white = imagecolorallocate( $overlay_img, 0xFF, 0xFF, 0xFF );
            $white_close = imagecolorclosest( $overlay_img, 0xFF, 0xFF, 0xFF );
            $magenta = imagecolorallocate( $overlay_img, 0xFF, 0x00, 0xFF );
            
            // and use it here:
            imagecolortransparent( $overlay_img, $white );
            // Attempt to get rid of near-whites
            imagecolortransparent( $overlay_img, $white_close );
            imagesavealpha( $overlay_img, true );
            imagealphablending( $overlay_img, false );
            // copy and merge the overlay image and the canvas image:
            imagecopymerge( $canvas_img, $overlay_img, 0, 0, 0, 0, $overlay_w, $overlay_h, $Opacity );

            // The text to draw
            $text = 'Copyright (c) ' . date(Y) . ' Space Web Design. All rights reserved.';
            // Replace path by your own font path
            //$font = imageloadfont('./gdf_fonts/trisk.gdf');
            $font = imageloadfont( './gdf_fonts/' . IMAGE_FONT );
            //$font = imageloadfont('./gdf_fonts/courier8.gdf');
            //$font = imageloadfont('./gdf_fonts/checkbook.gdf');
            //$font = 2;

            imagestring($canvas_img, $font, 10, $canvas_h-18, 'Copyright (c) ' . date(Y) . ' ' . COMPANY_COPYRIGHT , $white);
            // output:
            imagejpeg( $canvas_img, $SaveFilePath, $Quality );

            imagedestroy( $overlay_img );
            imagedestroy( $canvas_img );
    }

 

The colour I am using here for transparency is White. The string image is being generated from a flex application and is dynamic (hence the string function - it hasn't been saved, only POSTed).

 

Please help me... I've been trying to correct this for hours with no luck.  :-\

 

Thanks in advance,

John.