And draws white diagonal line across the image send the header

❑ Interlace and manipulate pixels

❑ Handle PostScript files

Before we look at the functions exposed by the API, we will take a quick look at some of the basic concepts we need to understand before we look at individual functions.

Each image is referred to by an integer identifier, similar to file and database handles. This identifier is returned when the image is opened, and we will pass it into all subsequent function calls which will work on the image.

// Create a new image, of size 100 x 100 pixels $im = ImageCreate(100, 100); // Allocate the colors for the image $black = ImageColorAllocate($im, 0, 0, 0); // background color $white = ImageColorAllocate($im, 255, 255, 255);

// Destroy the image after we are done ImageDestroy($im); ?>

Don't worry about the exact details of each function for the moment; we will look at all the PHP image functions in more detail in the next sections. It is only important to understand the basic principles to follow the rest of the chapter.

The first functions we will look at are those provided for creating, copying and deleting images, and for reading or setting properties of the entire image, such as its height and width.

ImageCreate

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