I've been trying to make this work for long hours now, I got to the point
where I could composite two images. However I'm currently having trouble
with (1)"reading multiple images", then individually (2)"compositing them on
different canvases" and then (3)"writing them as the same name as the
orginal images". Also, (4)"How do you center the original image on the
canvas?" I tried using DrawSetGravity(), but I just didn't know how to get
an image centered rather than a line of text.
Another thing that I tried was exec() to execute imagick commands. The code
was much shorter than the PHP magickwand code. (5)"Is it more convenient to
just execute commands through exec()?". It's odd that I don't have more
control over the images with PHP magickwand functions than with Imagick
command line, because for example, it is much easier to just center the
original image on the canvas just by including the parameter, "-gravity
center".
Here is the "main" flow of the current program:
1. Read an original image
2. Create a 640x480 white canvas
3. Composite original image on to the canvas
4. Write the composited image on to a jpeg file.
code:
<?php
// Get the image
$mgk_wnd1 = NewMagickWand();
MagickReadImage($mgk_wnd1, "1.gif");
// MagickReadImages($mgk_wnd1, glob("*.gif"));
// Normalization
MagickNormalizeImage($mgk_wnd1);
// MagickGetNumberImages($mgk_wnd1);
// Create a white 640x480 jpeg canvas
$mgk_wnd2 = NewMagickWand();
MagickNewImage($mgk_wnd2, 640, 480, "white");
MagickSetformat($mgk_wnd2, "jpg");
// Set offsets x and y
$x_offset = 100;
$y_offset = 100;
// Composite both original image and the canvas
MagickCompositeImage($mgk_wnd2, $mgk_wnd1, MW_OverCompositeOp, $x_offset,
$y_offset);
// Enhance image
MagickEnhanceImage($mgk_wnd2);
// Write the image to a file
MagickWriteImage($mgk_wnd2, "image.jpg");
// Clean up wands
if($mgk_wnd1 && $mgk_wnd2) {
$mgk_wnd1 = DestroyMagickWand($mgk_wnd1);
$mgk_wnd2 = DestroyMagickWand($mgk_wnd2);
}
/*
// use a variable for command line contents
$cmd1 = "convert -size 640x480 xc: white canvas3.jpg";
exec($cmd1);
$cmd2 = "composite -gravity center \*.gif canvas3.jpg \*.gif";
exec($cmd2);
*/
?>
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