arelfreectat
New Member
OK i thought i understood this function but i have a complete mental block on this one.I wanted to create cropped thumbnails of size 75x75 from photos that are 800x536.the imagecopyresampled function has 10 possible parameters. i first tried this:\[code\]// Starting point of crop $tlx = floor(($width / 2) - ($new_width / 2)); //finds halfway point of big image and subtracts half of thumb. $tly = floor(($height / 2) - ($new_height / 2)); //gets centre of image to be cropped.imagecopyresampled($tmp_img,$img,0,0,$tlx,$tly,$new_width,$new_height,$orig_width,$orig_height);\[/code\]this finds either side of the halfway mark on the large image and crops it out. or so i thought. but it actuall crops a bit of the picture and leaves the right hand side and bottom in black (presumably from the imagecreatetruecolor earlier.so i found a way to do what i want but i want you to explain how it is working.i now have:\[code\]//Create thumbnails. $new_width = 75; //pixels. $new_height = 75; if($width > $height) $biggest_side = $width; else $biggest_side = $height; //The crop size will be half that of the largest side $crop_percent = .5; $crop_width = $biggest_side*$crop_percent; $crop_height = $biggest_side*$crop_percent; $c1 = array("x"=>($width-$crop_width)/2, "y"=>($height-$crop_height)/2); //Create new image with new dimensions to hold thumb $tmp_img = imagecreatetruecolor($new_width,$new_height); //Copy and resample original image into new image. imagecopyresampled($tmp_img,$img,0,0,$c1['x'],$c1['y'],$new_width,$new_height,$crop_width,$crop_height);\[/code\]it's doing it perfectly, shrinking the image and then cropping out the middle, but my maths isn't very sharp and also i think it's definitely that i don't fully understand the imagecopyresampled function.can someone walk me through it? parameter by parameter. especially the last two. originally i entered the width and height of the original image, but this enters 400 and 400 (half of the longest side). sorry for the rant. hope my mind understands this soon 
Alex
Alex