uploading a JPEG and saving as non-progressive

lindajames

hi everyone, i am new to this forum

i need a script that will let me upload jpeg files onto my webspace in the "/upload" folder

but after uploading the file, the script needs to use GD or something to open it and save it in a non-progressive format in the "/upload/edited" folder

can anyone please help me out on this.

many thanx in advanced for any help

cheers
linda

bradgrafelman

Look at using functions such as [man]imagecreatefromjpeg/man and then [man]imagejpeg/man.

I don't know if it automatically turns on interlacing if you create from a Progressive JPEG, but a sure way to save it as non-progessive would be to force interlacing off:

$im = imagecreatefromjpeg('upload/'.$filename.'.jpg');
imageinterlace($im, 0);
imagejpeg($im, 'upload/edited/'.$filename.'.jpg', 100);

or something similar.

lindajames

any chance of anyone giving me a sample code? as i dont know much about php

bradgrafelman

Did you not notice the PHP code in my previous post?!

That is an example. The only differences would be to change the paths and filename variables to suit your specific site structure...

EDIT: There are almost always examples in the manual pages too, either from PHP.net or the user submitted comments. Try my example code, and if you can't get it to work, check out the manual page for the functions I used (I linked them in my previous post).

lindajames

thanx bradgrafelman,

that works fine, but can you tell me how i can upload a jpeg file and then carry out the GD force interlacing off, and then possibly delete the .jpg file that was uploaded into the upload folder, because the new version of that file will be saved in upload/edited.

cheers

bradgrafelman

Do you already know how to handle file uploads? If so, once you submit the form, you could use code like this:

if(!empty($_FILES['myFile']['tmp_name'])) {
    $im = imagecreatefromjpeg(ini_get('upload_tmp_dir').$_FILES['myFile']['tmp_name'])
    imageinterlace($im, 0);
    imagejpeg($_SERVER['DOCUMENT_ROOT'].'/upload/'.$_FILES['myFile']['name'], 100);
    unlink(ini_get('upload_tmp_dir').$_FILES['myFile']['tmp_name']);
}

NOTE: I haven't tested the above script. Also, you should change '/upload/' to the appropriate directory.

lindajames

thanx for your help bradgrafelman, but unfortunately i don't know how to handle uploads :o i was hoping someone would help me from uploading the file all the way to converting it to non-progessive and saving it in "upload/edited" and then deleting the one that was originally uploaded to the "/upload" folder because a edited copy has been placed in edited anyway.

your help would be very much appreciated.

thanx in advanced.

cheers

bradgrafelman

Oh, ok. Well, try this:

<?PHP
if(!empty($_FILES['myFile']['tmp_name'])) { 
	if($_FILES['myFile']['type'] != 'image/pjpeg') die('Invalid file type. Go back and try again.'.$_FILES['myFile']['type']);

$im = imagecreatefromjpeg($_FILES['myFile']['tmp_name']);
imageinterlace($im, 0); 
imagejpeg($im, $_SERVER['DOCUMENT_ROOT'].'/upload/'.$_FILES['myFile']['name'], 100); 
unlink($_FILES['myFile']['tmp_name']); 
} else {

// No file was uploaded; display form for uploading

?>

<form method=POST action="<?=$_SERVER['PHP_SELF'];?>" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="1048576">
File to upload: <input type="file" name="myFile"><br><input type="submit" value="Upload"></form>

<?PHP
}
?>

NOTE: I noticed some errors in the code I previously posted. If you use my code, use the code in my latest post.