在 PHP 中合并图像 - GIF 和 JPG
我正在尝试合并两个图像 - 一个GIF图像与一个较小的JPG图像。输出应该是GIF。
问题是GIF图像颜色保持正确,但JPG图像的颜色发生了变化。
GIF 图像只有 256 色(8 位),但是有没有办法使合并后的图像成为真彩色资源,稍后可以将其转换为 8 位 GIF 用于输出?
Issue solved.
我更新了代码。这是工作正常的解决方案:
<?php
header('Content-Type: image/gif');
$gif_address = 'file.gif';
$jpg_address = 'file.jpg';
$image1 = imagecreatefromgif($gif_address);
$image2 = imagecreatefromjpeg($jpg_address);
$merged_image = imagecreatetruecolor(800, 800);
imagecopymerge($merged_image, $image1, 0, 0, 0, 0, 800, 800, 100);
imagecopymerge($merged_image, $image2, 0, 0, 0, 0, 500, 500, 100);
imagegif($merged_image);
imagedestroy($image1);
imagedestroy($image2);
imagedestroy($merged_image);
?>
I am trying to merge two images - a GIF image with a smaller JPG image. The output should be GIF.
The issue is that GIF image colors remain correct, but the colors of the JPG image are altered.
The GIF image has only 256 colors (8-bit), but is there a way to make the merged image to be a true-color resource which later can be converted to a 8-bit GIF for output?
Issue solved.
I updated the code. Here is the solution which works fine:
<?php
header('Content-Type: image/gif');
$gif_address = 'file.gif';
$jpg_address = 'file.jpg';
$image1 = imagecreatefromgif($gif_address);
$image2 = imagecreatefromjpeg($jpg_address);
$merged_image = imagecreatetruecolor(800, 800);
imagecopymerge($merged_image, $image1, 0, 0, 0, 0, 800, 800, 100);
imagecopymerge($merged_image, $image2, 0, 0, 0, 0, 500, 500, 100);
imagegif($merged_image);
imagedestroy($image1);
imagedestroy($image2);
imagedestroy($merged_image);
?>
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根据你的解释(一些代码会有所帮助),我猜测你正在将 jpeg 合并到 gif 上。我想说最简单的方法是使用 imageCreateTrueColor 创建所需大小的新图像,然后使用 imagecopy 将 GIF 复制到该新图像中。将 jpg 合并到此上,稍后您可以将真彩色图像转换为 gif。
如果我错过了一些您当前正在做的示例代码可能会有所帮助。
From your explanation (some code would help), i would hazard a guess you are merging the jpeg onto the gif. Id say the easiest way is to use imageCreateTrueColor to create a new image the size you need then use imagecopy to copy the GIF into this new image. Merge the jpg onto this and then at a later date you can covert the true colour image to a gif.
If im missing something a bit of example code of what you are currently doing might help.