ImageCopyResized(dest, src, dx, dy, sx, sy, dw, dh, sw, sh);
ImageCopyResampled(dest, src, dx, dy, sx, sy, dw, dh, sw, sh);
來看一個例子，我們將這個圖縮小四倍：<?php
$src = ImageCreateFromJPEG('php.jpg');
$width = ImageSx($src);
$height = ImageSy($src);
$x = $width/2; $y = $height/2;
$dst = ImageCreateTrueColor($x,$y);
ImageCopyResized($dst,$src,0,0,0,0,$x,$y,$width,$height);
//ImageCopyResampled($dst,$src,0,0,0,0,$x,$y,$width,$height);
header('Content-Type: image/jpeg');
ImageJPEG($dst,'',100);
?>
原圖：
使用ImageCopyResized()函數產生的結果：
使用ImageCopyResampled()函數產生的結果：
很明顯可以看到兩個函數產生的映像效果是不一樣的，ImageCopyResampled()函數產生的結果比較平滑，效果較好。
順便貼一個效果，用ASCII表示映像。ImageColorAt()有一個很有趣的用處，它可以迴圈檢查
映像中的每一個像素的顏色，然後對該顏色資料進行操作。原始碼：
<html><body bgcolor="#000000" style="line-height:6pt"> <?php
$im = imagecreatefromjpeg('test1.jpg');
$dx = imagesx($im);
$dy = imagesy($im);
for($y = 0; $y < $dy; $y++) {
for($x=0; $x < $dx; $x++) {
$col = imagecolorat($im, $x, $y);
$rgb = imagecolorsforindex($im,$col);
printf('<font color=#%02x%02x%02x>*</font>',
$rgb['red'],$rgb['green'],$rgb['blue']);
}
echo "<br>\n";
}
imagedestroy($im);
?>
</body></html> 很有趣吧，呵呵..
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