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Viewing Issue Simple Details
ID Category Type Reproducibility Date Submitted Last Update
0000714 [In-Portal CMS] Other feature request always 2010-04-26 07:54 2010-08-31 14:13
Reporter Dmitry View Status public  
Assigned To alex
Priority normal Resolution open  
Status needs work      
Summary 0000714: Add ability to generate "Rounded" and "Grayscale" images
Description Improve our current Image helper (already powerful tool) and teach new things like create new version of the image:

- Rounded
- Grayscale
Additional Information 1. Converting to Rounded
======================
function imageRoundedCopyResampled(&$dstimg, &$srcimg, $dstx, $dsty,
$srcx,
                                   $srcy, $dstw, $dsth, $srcw, $srch,
$radius) {
    # Resize the Source Image
    $srcResized = imagecreatetruecolor($dstw, $dsth);
    imagecopyresampled($srcResized, $srcimg, 0, 0, $srcx, $srcy,
                       $dstw, $dsth, $srcw, $srch);
    # Copy the Body without corners
    imagecopy($dstimg, $srcResized, $dstx+$radius, $dsty,
              $radius, 0, $dstw-($radius*2), $dsth);
    imagecopy($dstimg, $srcResized, $dstx, $dsty+$radius,
              0, $radius, $dstw, $dsth-($radius*2));
    # Create a list of iterations; array(array(X1, X2, CenterX,
CenterY), ...)
    # Iterations in order are: Top-Left, Top-Right, Bottom-Left,
Bottom-Right
    $iterations = array(
        array(0, 0, $radius, $radius),
        array($dstw-$radius, 0, $dstw-$radius, $radius),
        array(0, $dsth-$radius, $radius, $dsth-$radius),
        array($dstw-$radius, $dsth-$radius, $dstw-$radius, $dsth-
$radius)
    );
    # Loop through each corner 'iteration'
    foreach($iterations as $iteration) {
        list($x1,$y1,$cx,$cy) = $iteration;
        for ($y=$y1; $y<=$y1+$radius; $y++) {
            for ($x=$x1; $x<=$x1+$radius; $x++) {
                # If length (X,Y)->(CX,CY) is less then radius draw
the point
                $length = sqrt(pow(($cx - $x), 2) + pow(($cy - $y),
2));
                if ($length < $radius) {
                    imagecopy($dstimg, $srcResized, $x+$dstx, $y+
$dsty,
                              $x, $y, 1, 1);
                }
            }
        }
    }
}

could be a better solution, which does this:

   - draws white square based on source image dimensions
   - cuts circle from the midle
   - places original image under prepared image so only image part, that fits the hole is visible

This approach will use standard GD function, like "imagefilledellipse" and
so on.


2. Converting to Grayscale
======================
$source_file = "test_image.jpg";
$im = ImageCreateFromJpeg($source_file);
$imgw = imagesx($im);
$imgh = imagesy($im);
for ($i=0; $i<$imgw; $i++)
{
        for ($j=0; $j<$imgh; $j++)
        {
                // get the rgb value for current pixel
                $rgb = ImageColorAt($im, $i, $j);
                // extract each value for r, g, b
                $rr = ($rgb >> 16) & 0xFF;
                $gg = ($rgb >> 8) & 0xFF;
                $bb = $rgb & 0xFF;
                // get the Value from the RGB value
                $g = round(($rr + $gg + $bb) / 3);
                // grayscale values have r=g=b=g
                $val = imagecolorallocate($im, $g, $g, $g);
                // set the gray value
                imagesetpixel ($im, $i, $j, $val);
        }
}

header('Content-type: image/jpeg');
imagejpeg($im);

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