Question

Make different size and format of pictures of a unknown format picture

Asked by: lemontree

Dear All,
   I now have a problem that I need to make a picture (may be a JPG, GIF, TIF or unknown format) to be cut in different size and different format under some requirements.
   For example, now
1. a user choose a picture(don't know the format)
2. he upload the picture to the server by clicking a button
3. then we need to make the picture to be some formats
   a. JPG (fixed size)
   b. Unknown format (unknown size) [The format is decided by the user]

How can I do this?

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Asked On
2002-02-22 at 20:02:09ID20270107
Tags

format

,

unknown

Topic

PHP Scripting Language

Participating Experts
3
Points
300
Comments
9

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Answers

 

by: andrivPosted on 2002-02-22 at 20:31:14ID: 6820552

You need to use the GD library, free software for manipulating images and PHP's image functions. You can find the GD library's home page from www.boutell.com/gd or www.cdrom.com/pub/png.

I don't know if it will handle all files but I know it works with jpeg, gif and png.

 

by: dkjariwalaPosted on 2002-02-22 at 23:02:18ID: 6820681

Hello,
 
GD doesnt support GIF format due to copy right issues.
The current stable version (1.8.4) creates PNG, JPEG and WBMP formats.

Also, resizing using GD reduces the image quality and you don't have tight control over the manipulation.

Though it can be good choice if you want to deal with those types cause PHP has built in support for GD.

That's why I would suggest you to go for Imagemagick.

http://www.imagemagick.org/

It supports more than 68 formats. Check
http://www.imagemagick.org/www/formats.html

Also, not only you can convert the image , you can also mogrify, montage, composite, or identify the image. Check the homepage for more information.

Only thing is PHP doesn't have built in support for it and you would have to use system or exec function to call the imagemagick program.

Thought I highly recommend using Imagemagick !!

JD

 

by: BatalfPosted on 2002-02-23 at 06:13:23ID: 6820897

I also recommend ImageMagick.

Here's an example of how I used ImageMagick

Step 1 :
/* Generate the name of the file you want to convert
to. Extension is important for the convert-tool */
$newFile = "nameofnewfile.jpg";

/*use GetImageSize to get the width and height of your uploaded file.*/



$size = getimagesize($uploadedFile)
$width = $size[0];


/* Getting size of the converted image relativ to
original - percentage */

$convertedSize = (200 / $width)*100;

/*
// Now we should call the convert executable file.
// ImageMagick will now convert the $uploadedFile to a
// converted file;
// $path = the relative path from where we're standing to
// where convert is located.
*/


exec("$path/convert geometry $convertedSize% $uploadedFile $newFile);

Then you could use the  $newFile instead of $uploadedFile

Hopefully this could help you!

Batalf

 

by: BatalfPosted on 2002-02-23 at 06:13:53ID: 6820898

exec("$path/convert geometry $convertedSize% $uploadedFile $newFile);

should be

exec("$path/convert -geometry $convertedSize% $uploadedFile $newFile);

 

by: lemontreePosted on 2002-02-24 at 17:09:33ID: 6823428

Dear All,
    Thank you for supporting me, I now trying to write the program, but I think I need some time
    ^_^

 

by: lemontreePosted on 2002-02-24 at 17:47:02ID: 6823483

Is that need config for Unix and Linus?

 

by: dkjariwalaPosted on 2002-02-24 at 20:27:01ID: 6823732

20120131-EE-VQP-002

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