imagecolorat
A way to get each time an answer :
<?php
function imagegetcolor($im, $r, $g, $b) {
$c=imagecolorexact($im, $r, $g, $b);
if ($c!=-1) return $c;
$c=imagecolorallocate($im, $r, $g, $b);
if ($c!=-1) return $c;
return imagecolorclosest($im, $r, $g, $b);
}
?>
If the *exact* color is found in the image, it will be returned. If we don't have the exact color, we try to allocate it. If we can't allocate it, we return the closest color in the image.
imagecolorclosest
(PHP 4, PHP 5)
imagecolorclosest — Ανακτείστε το δείκτη του πιο κοντινού, στο προσδιορισμένο, χρώματος
Περιγραφή
int imagecolorclosest
( resource $image
, int $red
, int $green
, int $blue
)
Επιστρέφει το δείκτη του χρώματος της παλέττας της εικόνας, που είναι το πιο "κοντινό" στην προσδιορισμένη RGB τιμή.
Η "απόσταση" μεταξύ του επιθυμητού χρώματος και κάθε χρώματος στην παλέττα υπολογίζεται σαν οι RGB τιμές να αντιπροσώπευαν σημεία τρισδιάστατου χώρου.
Ανατρέξτε επίσης στην imagecolorexact().
add a note
User Contributed Notesimagecolorclosest
MagicalTux at FF dot st
28-Jun-2005 06:22
28-Jun-2005 06:22
Vikrant Korde <vakorde at hotmail dot com>
11-Oct-2003 08:10
11-Oct-2003 08:10
This functuion is useful when you are dealing with previously present images like .png, .jpg, etc. You can use this function for writing a text on the image.
For me the function imagecolorallocate() was returning the -1 value. after lot of RnD and site search i found a function use of imagecolorclosest(). This solved my problem of writing the text on the image with customised color.
Actually previously it was writing on the image but the color was not distinct. It was using the same color as of that background image.
The following code segment was fine with me.
header ("Content-type: image/jpeg");
$im = imagecreatefromjpeg("BlankButton.jpg");
$white = imageColorClosest($im, 255,255,255);
// this is for TTF fonts
imagettftext ($im, 20, 0, 16, 30, $white, "/usr/X11R6/lib/X11/fonts/TTF/luximb.ttf", "Vikrant");
//this is for notmal font
imagestring($im, 4, 0,0,"Korde", $white);
imagejpeg($im,"",150);
imagedestroy ($im);