A PHP script to downsample the image resolution

[bukaida]

Can anybody provide any php script which can print the resolution of the selected image(Tiff, jpeg i.e. mainly scanned image) and can be used to downsample the resolution according to user's choice?

 

[kalpik]

Have a look at *www.phpit.net/article/image-manipulation-php-gd-part2/

 

[Sukhdeep Singh]

Check this out, it will surely help you
*vikjavev.no/highslide/#examples

 

[tuxfan]

Have a look at *in2.php.net/gd

 

[bukaida]

Does the GD library supports Tiff format? No where it is mentioned clearly.Also in my gd info is----

GD Version: bundled (2.0.28 compatible)
FreeType Support: Enabled
FreeType Linkage: Enabled
T1Lib Support: Disabled
GIF Read Support: Enabled
GIF Create Support: Enabled
JPG Support: Enabled
PNG Support: Enabled
WBMP Support: Enabled
XBM Support: Enabled
JIS-mapped Japanese Font Support: Disabled

Will it do or I have to change something?Tiff support is mainly required.
Also downsampling here mentioned are all about reducing the size, but I want to reduce the resolution(i.e from 600 DPI to 300 DPI or something like that).Please help.