Leaderboard

Have you tried $im = imagecreatefromjpeg('../images/celule.jpg'); imagefilter($im, IMG_FILTER_GRAYSCALE); imagefilter($im, IMG_FILTER_CONTRAST, -1000); header("Content-type: image/jpeg"); imagejpeg($im); imagedestroy($im); Emulating you matlab example $im = imagecreatefromjpeg('../images/celule.jpg'); imagefilter($im, IMG_FILTER_GRAYSCALE); $white = imagecolorallocate($im, 255,255,255); $black = imagecolorallocate($im, 0,0,0); $w = imagesx($im); $h = imagesy($im); for ($x=0; $x<$w; $x++) { for ($y=0; $y<$h; $y++) { $c = imagecolorat($im, $x, $y); if ($c & 0xFF > 190) // blue component imagesetpixel($im, $x, $y, $white); else imagesetpixel($im, $x, $y, $black); } } header("Content-type: image/jpeg"); imagejpeg($im); imagedestroy($im); Gives an effect like this (top-left corner of image)

And what's the problem? I see some PHP code there which looks like it's on the right path. In fact it already has something to grayscale an image, so I would think that what you need to do is simply modify that to use black and white instead.

the warnings and notices are from php. they have nothing to do with with any framework the site is using for the presentation of information. the glob() is not matching any files and your code should test ( !empty($var) would work) before trying to access any of the results and output an appropriate message if no matching file was found. as to why the glob calls are failing, it would either be due to a problem with the spelling, capitalization, actual path being used, or there are no matching files inside the folders.