Are there any PHP libraries or functions that can help with detecting and converting color modes in JPEG images?

Detecting and converting color modes in JPEG images can be achieved using the PHP GD library. By using functions like imagecreatefromjpeg() to create a GD image resource from a JPEG file, and imagecolorat() to get the color of a pixel, you can determine the color mode of the image. To convert the color mode, you can use functions like imagefilter() to apply color transformations.

// Load a JPEG image
$image = imagecreatefromjpeg('image.jpg');

// Get the color of a pixel at a specific location
$pixelColor = imagecolorat($image, 10, 10);

// Convert the color mode of the image
imagefilter($image, IMG_FILTER_GRAYSCALE);

// Save the converted image
imagejpeg($image, 'converted_image.jpg');

// Free up memory
imagedestroy($image);