How to ensure an image is a truecolor image using the imageistruecolor() function in PHP?

imageistruecolor() is an inbuilt function in PHP that is used to check if a given image is a true-color image or not. In a true-color image, each pixel is specified by the RGB (Red, Green, and Blue) color values.

Syntax

bool imageistruecolor(resource $image)

Parameters

imageistruecolor() takes a single parameter, $image. It holds the image.

Return Values

imageistruecolor() returns True if the given image is true-color or else, it returns False if the image is not a true-color image.

Example 1

<?php    // Create an image instance with a true-color image using    //imagecreatefrompng() function.    $img = imagecreatefrompng('C:\xampp\htdocs\Images\img44.png');    // Checked if the image is true-color    $istruecolor = imageistruecolor($img);    // Show the output image to the browser    if($istruecolor) {       echo "The given input image is true-color";    } ?>

Output

// Input RGB image

// Resultant Output

The given input image is true-color.

Example 2

<?php    // Create an image instance with a true-color image using    //imagecreatefrompng() function.    $img = imagecreatefrompng('C:\xampp\htdocs\Gray.png');        // Checked if the image is true-color    $istruecolor = imageistruecolor($img);       // Show the output image to the browser    if($istruecolor) {       echo "The given input image is not a true-color";    } ?>

Output

// An input gray color image.

// Output

The given input image is not a true-color image.