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.