PHP is not limited to creating just HTML output. It can also be
used to create and manipulate image files in a variety of different
image formats, including gif, png, jpg, wbmp, and xpm. Even more
convenient, PHP can output image streams directly to a browser. You
will need to compile PHP with the GD library of image functions for
this to work. GD and PHP may also require other libraries, depending
on which image formats you want to work with.
You can use the image functions in PHP to get the size of
TIFF and JPEG2000 images.
With the exif extension, you are able
to work with information stored in headers of
JPEG and TIFF images. This way you can
read meta data generated by digital cameras. The exif
functions do not require the GD library.
Read the requirements section about how to expand image capabilities
to read, write and modify images. To read meta data of pictures
taken by digital cameras you need the above mentioned