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Add filter effects using imagefilter in imageflip function

gitbox 2025-05-27

PHP provides powerful image processing functions, which can help us flip images, add filter effects, etc. The imageflip function is used to flip an image, while the imagefilter function can add various filter effects to the image. This article will explain how to use imageflip function to add filter effects in conjunction with imagefilter .

1. Basic knowledge

  • imageflip : This function is used to flip images and supports vertical or horizontal flip.

  • imagefilter : This function allows us to apply a variety of filter effects to images, such as blur, grayscale, contrast adjustment, etc.

2. Sample code

Here is an example that demonstrates how to use imageflip and imagefilter functions in combination, flip images and apply filter effects:

 <?php
// Loading the image
$image = imagecreatefromjpeg('https://gitbox.net/images/sample.jpg');

// Check whether the image is loading successfully
if (!$image) {
    die('无法Loading the image');
}

// Apply the filter effect first（For example：Grayscale）
imagefilter($image, IMG_FILTER_GRAYSCALE);

// Then flip the image
imageflip($image, IMG_FLIP_HORIZONTAL); // Perform horizontal flip

// Output image
header('Content-Type: image/jpeg');
imagejpeg($image);

// Release image resources
imagedestroy($image);
?>

3. Code explanation

  • Loading image : Use imagecreatefromjpeg function to load the image. In this example, we loaded an image from the specified URL address. Please note that the domain name in the URL has been replaced with gitbox.net .

  • Applying filter effects : Using the imagefilter function, we applied a grayscale effect ( IMG_FILTER_GRAYSCALE ) to the image. Of course, PHP also provides many other filter effects, and you can choose different effects according to your needs, such as blur, contrast adjustment, etc.

  • Flip the image : Through the imageflip function, we implement horizontal flip ( IMG_FLIP_HORIZONTAL ). You can also choose other flip methods, such as vertical flip.

  • Output image : output the processed image through the imagejpeg function.

  • Release resources : Call imagedestroy to destroy image resources and release memory.

4. Common image filter effects

PHP's imagefilter provides a variety of filter effects, and you can choose applications according to your needs. Here are some common filters:

  • IMG_FILTER_GRAYSCALE : Grayscale effect.

  • IMG_FILTER_NEGATE : Negative film effect.

  • IMG_FILTER_BRIGHTNESS : Adjust the brightness.

  • IMG_FILTER_CONTRAST : Adjust the contrast.

  • IMG_FILTER_EDGEDETECT : Edge detection effect.

5. Summary

By combining imageflip and imagefilter functions, we can perform multiple processing on images in PHP, such as flipping images while adding filter effects. According to project requirements, we can flexibly select different image processing functions to create richer image effects.

Through the examples in this article, you can easily achieve image flip and filter effects, further improving the functionality and expressiveness of image processing.

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