php thumbnail creation

marc2003 · 9 May 2007 at 13:43

i have a script that resizes images but the quality of the thumbnail isn't as good as those i've seen around on other sites. do other image uploaders use php or do they use something else?

edit: links removed. it's been fixed below.

Sic · 9 May 2007 at 13:46

i'm assuming you're outputting using imagejpeg/imagegif/imagepng?

bool imagejpeg ( resource $image [, string $filename [, int $quality]] )

last argument can be between 0 (being worst quality, small files) and 100 (best quality, large files)

marc2003 · 9 May 2007 at 14:02

yup, i am using imagejpeg. just tried changing it to 100 and still no better. not that it matters at all, i was just wondering how other sites do it better?

Dj_Jestar · 9 May 2007 at 14:08

"Native" PHP functions rely on the GD library to compile the new images, one assumes they have a better library for it. I do not know of any such library.

marc2003 · 9 May 2007 at 14:19

ah ok. cheers.

Beansprout · 9 May 2007 at 14:28

I can't tell the difference between those examples :/

But have a look at imagecopyresampled() and also the Imagemagick system

Augmented · 9 May 2007 at 14:30

Beansprout said:
imagecopyresampled()

I'd go with that too - changing from imagecopyresized will stop (reduce) the aliasing appearing in those thumbnails.

marc2003 · 9 May 2007 at 14:33

good stuff. that's done the trick.