The lines cause all images with the extension jpeg, jpg, gif, png or webp to be sent to a PHP file called image-resizer.php. The name of the PHP file can be changed, but must then also be in the ...

Figure 3: Transparency Another feature similar to transparency are alpha-channels. Alpha-channels allow you to set the opacity of pixels in your image to a range from 0 to 255. What this does is ...

For example, it is possible to hide PHP code inside an image file and still have it appear to be an image. When the image is opened, it also executes the code hidden in the file. The file could ...