Re: cropping an image script

Hi, Friday, March 14, 2003, 2:07:28 AM, you wrote: AR> In the following php script, the function takes the original file and crops AR> to the destination file. AR> I've ran the script using a .png file and a .jpg file. AR> The .png works fine whereas the .jpeg file returns only part of the image AR> along with a blue rectangle. AR> For instance - where the original image is a 200 x 300 jpeg called: AR> 1_data.jpeg AR> and the destination iamge is 75x75 called: AR> 2_data.jpeg AR> and starting at the x,y coordinates of 0,0 - the script returns a 75x 75 AR> file but only a sliver of the .jpg image is within the 75x75 blue square. AR> Any help will be of assistance. AR> Thank you. AR> Tony Ritter AR> ........................................................ AR> The following is the php cropping script (with author credit): AR> <? AR> // AR> // image crop fuction ..... Duck@obala.net AR> // info at http://obala.net/en AR> // AR> // Yes the proses could be executed with imagecopyresized build-in function AR> // but with this function you get the idea of how an image color set is AR> constructed AR> // AR> // $cropX = source starting X AR> // $cropY = source starting Y AR> // $cropW = crop weigth AR> // $cropH = crop heigh AR> // $source = source filename AR> // $destination = destination filename AR> // $type = image type AR> function AR> im_crop($cropX,$cropY,$cropH,$cropW,$source,$destination,$type='jpeg') { AR> // switch known types and open source image AR> switch ($type) { AR> case 'wbmp': $sim = ImageCreateFromWBMP($source); break; AR> case 'gif': $sim = ImageCreateFromGIF($source); break; AR> case 'png': $sim = ImageCreateFromPNG($source); break; AR> default: $sim = ImageCreateFromJPEG($source); break; AR> } AR> // create the destination image AR> $dim = imagecreate($cropW, $cropH); AR> // pass trought pixles of source image AR> for ( $i=$cropY; $i<($cropY+$cropH); $i++ ) { AR> for ( $j=$cropX; $j<($cropX+$cropW); $j++ ) { AR> // get RGB color info about a pixel in the source image AR> $color = imagecolorsforindex($sim, imagecolorat($sim, $j, $i)); AR> // insert the color in the color index of the new image AR> $index = ImageColorAllocate($dim, $color['red'], AR> $color['green'], $color['blue']); AR> // plots a pixel in the new image with that color AR> imagesetpixel($dim, $j-$cropX, $i-$cropY, $index); AR> } AR> } AR> // whe dont need the sorce image anymore AR> imagedestroy($sim); AR> // switch known types and save AR> switch ($type) { AR> case 'wbmp': ImageWBMP($dim, $destination); break; AR> case 'gif': ImageGIF($dim, $destination); break; AR> case 'png': ImagePNG($dim, $destination); break; AR> default: ImageJPEG($dim, $destination); break; AR> } AR> // free the used space of the source image AR> imagedestroy($dim); AR> } AR> // example AR> im_crop(0,0,75,75,'1_data.jpeg','2_data.jpeg','jpeg'); ?>> With jpegs you need to use $im2 = imagecreatetruecolor($x,$y) and just write the pixel back using imagesetpixel($im, $x, $y, $p); like this: $im =imagecreatefromjpeg($filename); $dim = imagecreatetruecolor($cropW, $cropH); for ( $i=$cropY; $i<($cropY+$cropH); $i++ ) { for ( $j=$cropX; $j<($cropX+$cropW); $j++ ) { $pixel = imagecolorat($im, $x, $y); imagesetpixel($dim, $j-$cropX, $i-$cropY, $pixel); } } As it is true colour no need to use indexes. -- regards, Tom