file upload size change....

[Kevmaster]

i am building a gallery. i want the user to be able to upload an image to a folder of the gallery. thats done. when the gallery opens, though, it finds the real images and displays them, just setting the width of the image to 125px. is there any way, when a user uploads the image, to change the file size (either in KB or in PX) so as to allow the gallery to view a thumbnail size image and display that while linking to the large image.

this would just help 56k people.

thanks!

(ps: I've done everything but the thumbnail upload)

[rgermain]

I would recommend google for this problem or heck even just search this forum for the same problem. You will find tons of scripts on google and probably many threads that already answer this question.

[Drakla]

If you've got php with the gd or gd2 libraries installed you can sort this out in no time, there have been loads of threads on here about it - This is my own routine for resizing to a jpeg from a png, gif or jpg as input to a limited size, just modify it to your own needs. I think there's enough info there for it to be easily modded

function resize_jpeg($fileName, $newX, $newY, $fixedAspect=0, $quality=50, $outfile='')
{
	$picInf=getimagesize ($fileName);

//this works a treat
if($picInf[0]<=$newX && $picInf[1]<=$newY && $outfile)	//it's already small enough
{
	return move_uploaded_file ( $fileName, $outfile );
}

switch( $picInf['mime'] )
{
	case 'image/gif':
		$im=imagecreatefromgif( $fileName );
		break;
	case 'image/jpeg':
		$im=imagecreatefromjpeg( $fileName );
		break;
	case 'image/png':
		$im=imagecreatefrompng( $fileName ) ;
}

if( @!$im ) return NULL;

if($fixedAspect)	//have to fit in that box, baby
{
	$xRatio=(float) imagesx($im)/$newX;
	$yRatio=(float) imagesy($im)/$newY;

	if( $xRatio > $yRatio )
	{
		$newY=imagesy($im) / $xRatio;			//scale to X
	}
	else
	{
		$newX=imagesx($im) / $yRatio;			//scale to Y
	}
}

$im2=imagecreatetruecolor($newX, $newY);

imagecopyresampled($im2, $im, 0, 0, 0, 0, $newX, $newY, imagesx($im), imagesy($im) );

imagejpeg($im2, $outfile, $quality);

imagedestroy($im);
imagedestroy($im2);

return 1;
}