如何在不损失图像质量的情况下从JPG中删除exif?

我有一个PHP照片共享应用程序，其中使用ImageMagick将用户上传的图像调整为各种缩略图格式.

I have a PHP photo sharing application in which user-uploaded images are resized into various thumb formats using ImageMagick.

作为一种看似智能"的方式来节省文件大小，我从这些大拇指上剥离了exif信息，如下所示:

As a seemingly "smart" way to save on file size, I am stripping exif info from these thumbs as follow:

$imagick = new Imagick($image);
$imagick->stripImage();
$imagick->writeImage($image);

这有效.它确实删除了EXIF信息，其中30KB的大拇指节省了12KB，而变成18KB.在单个页面上显示许多这样的拇指时，可节省大量资金.

This works. It does remove the EXIF info, where a thumbs of 30KB saves 12KB and becomes 18KB. A significant saving when showing many of such thumbs on a single page.

但是，问题是它工作得太好了.与未剥离的图像相比，所产生的图像似乎丢失了许多颜色信息，并且看起来平坦".

The problem however is that it works a little too well. The resulting images seem to lose a lot of color information and look "flat" compared to their non-stripped versions.

根据我到目前为止的研究，我的理论是以下一项或两项是正确的:

Based on my research so far, my theory is that one or both of the following is true:

• Imagick在剥离过程中会丢弃必要的颜色配置文件信息
• Imagick保存后会重新压缩图像，从而导致图像质量下降

不管造成问题的原因是什么，我都在寻找一种删除EXIF信息的方式，该方式不会影响图像质量或颜色本身.

Regardless of the cause of the problem, I'm looking for a way to remove EXIF information in such a way that it does not affect the image quality or color itself.

这有可能吗?

更新:

根据Gerald Schneider的回答，我尝试在将图像剥离"之前将质量设置强制为100％:

Based on Gerald Schneider's answer, I tried enforcing the quality setting to 100% prior to "stripping" the image:

$imagick = new Imagick($image);
$imagick->setCompression(imagick::COMPRESSION_JPEG);
$imagick->setCompressionQuality(100);
$imagick->stripImage();
$imagick->writeImage($image);

不幸的是，问题仍然存在.下面是示例输出，尽管将质量设置为100％，但图像仍会变平.

Unfortunately, the problem remains. Below is example output where despite setting the quality to 100%, images are still flattened.