Using Php to create thumbnails

Anon

I would like to be able to have a file upload script on my web page, where a user can upload a image of jpeg or gif format and then have the php script make a thumbnail of that image and store both the thumbnail and original image in a directory. Is this possible and if so which graphic function would i need to use to resize the picture. Also when i mean resize the picture i mean both the pixel size along with the byte size meaning that if i had a 300X200 pixel image that was 40k i want a thumbnail that has dimensions of 100x100 pixels and a byte size much less than 40k

Thanks for your help and time.

ira

Anon

Hi.

I doubt the gd library would be usefull (but check in the doc anyway 😉 ).

If there is no such function available, you can have a look at image magick. This shall let you do what your looking for.

[deleted]

The GD library has "imagecopyresized()"
which is perfect for the job, but it is very basic,
so don't expect DTP quality results. It is enough for most purposes.

Anon

Will imgaecopyresize work with jpeg and gif format. I am using a commercial server not my own so i wont be able to install any software on it.

Thanks.

Ira

[deleted]

imagecopyresized() works with image data.
JPG and PNG are compression formats.
So a more appropriate question would be:
Does the GD library installed on the server accept JPG and PNG.

If it is a recent installation then PNG will be supported. JPG is a different matter, that is an extra bit that the sysadmin has to install.

Ask your sysadmins for more info.

Anon

Sorry about all the messages, but im somewhat confused. Would i be correct by saying that imagecopyresize() will handle any type of image format? If that was true, why would i need to worry about gd.

Thanks.

Ira

Anon

Sorry to sound confusing.

the GD library opens images and de-compresses them from JPG or PNG into
raw data. That raw data-image is resized, and when you save/view the image, it is re-compressed.

So you could use imagecopyresized() on any image format, providing
GD knows how to compress ad uncompress it.