Generate thumbnail

SiMZ

Hi,

I want to generate thumbnail of an image. Obviously setting the image width and height is causing distortion.

Need to know the new width and height of the image at runtime and put that in the <img> tag to resize it.

Please help me to do this.

Thanks

mcgruff

If I remember rightly there's a sample bi-cubic resampler function in the php user manual.

axo

WAH! bad idea! 😃

$size = getimagesize("mypic.jpg") would give you an array:

$size[0] is it's width, $size[1] is the height. rtfm to know more of it.

but generating a thumbnail doesn't mean to take a 20 KB picture and showing it at a width of 80 and a height of 60, 'cause it will still be the size of 20 KB ... think of it!

you'll need the gd-library to generate and store a real thumbnail of a picture. use the search function for this.

cya
axo

Weedpacket

Originally posted by axo
WAH! bad idea! 😃

It's for those who don't have GD2 and want to emulate imagecopyresampled 🙂

Geologics

axo,

Thanks for the hint on thumbnails.

Indeed, you are correct that the width and height will be the same as the original image. However if the width of the thumbnail is going to be constant, a quick mental arithmetic exercise completes the thumbnail image.

$size = getimagesize("mypic.jpg"); // gives the image height and width

$myHeight=300*$size[1]/$size[0]; // assumes all thumnails will be 300 px wide

You can then insert the image:

Works a treat!

Once again, my thanks.