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imagecopymergegray (PHP 4 >= 4.0.6, PHP 5) imagecopymergegray -- 用灰度拷贝并合并图像的一部分 说明int imagecopymergegray ( resource dst_im, resource src_im, int dst_x, int dst_y, int src_x, int src_y, int src_w, int src_h, int pct)
将 src_im 图像中坐标从
src_x，src_y
开始，宽度为 src_w，高度为 src_h
的一部分拷贝到
dst_im 图像中坐标为
dst_x 和 dst_y
的位置上。两图像将根据 pct
来决定合并程度，其值范围从 0 到 100。当 pct = 0
时，实际上什么也没做，当为 100 时本函数和 imagecopy() 完全一样。
本函数和 imagecopymerge()
完全一样只除了合并时通过在拷贝操作前将目标像素转换为灰度级来保留了原色度。
 add a note
User Contributed Notes
imagecopymergegray
mail at laeubi dot de
09-Oct-2003 03:45
This function don't work properly for me on trucolerimages (have not tried
yet for other types) it jsut produce a part-grayscale image, and some color
get mesed up.
I found a workaround here:
http://www.phpbuilder.com/columns/cash20030526.php3?page=2
[quote]
Advanced
Image Editing Under the GD Library
Colorizing
Colorizing images is
fairly easy to do. The easiest way to colorize an image is fairly simple to
grasp. Create an image of the same dimensions and fill that image with the
color you want to change it to. This new image is then placed on top of the
older image, giving it a colorized look.
<?php
function
imagecolorize(&$im,&$col,$pct) {
// Get the image's width
$im_w = imagesx($im);
// Get the image's height
$im_h = imagesy($im);
// Set a pixel with the color, so we can get
it easily
$setpixel = imagesetpixel($im,$im_w,0,$col);
//
Get the color
$index = imagecolorat($im,$im_w,0);
// Find
the color in the index
$rgb = imagecolorsforindex($im,$index);
// Get the red value
$r = $rgb["red"];
//
Get the green value
$g = $rgb["green"];
// Get
the blue value
$b = $rgb["blue"];
// Create the
layover
$layover = imagecreate($im_w,$im_h);
// Allocate
the color on this image
$color =
imagecolorallocate($layover,$r,$g,$b);
// Fill the image with the
new color (this really isn't needed)
$fill =
imagefill($layover,0,0,$color);
// Merge the layover on top of the
older image
$merge =
imagecopymerge($im,$layover,0,0,0,0,$im_w,$im_h,$pct);
imagedestroy($layover); // Destroy the layover
}
?>
If
we use a blue layover RGB(0,0,255), we get this
result:
[/quote]
if you use black or gray, its not perfekt, but
better than nothing ;)
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imagecopymerge
