Question

[HOW TO] resize bmp image

Asked by: jhilden

on my site a user selets a picture to upload and a thumbnail is created from that picture.  I am using the following functions:

$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($image);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

this works perfectly when the uploaded file is a jpg, but when the file is a bmp it fails.  

I've tried using the "imageCreateFromWBMP" function but that doesn't seem to work either.

Is there a built in function that I can use to resize bmp files?  I'm sure the solution for this problem isn't too tough but I can't find it anywhere.

Thanks in advance.

Jay

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Asked On
2005-02-01 at 08:26:02ID21297039
Tags

bmp

,

resize

Topic

PHP and Databases

Participating Experts
3
Points
125
Comments
7

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Answers

 

by: wgordyPosted on 2005-02-01 at 09:22:54ID: 13194835

It's just another create function for bitmaps. That's the only thing that would change. You might want to try converting the bmps into jpegs since bmps are not web supported, but I don't know what your goal is.

http://netpbm.sourceforge.net/

That's a library for conversions of images using GD in PHP.

Good luck.

This article can help you too.

http://gvtulder.f2o.org/articles/gd-library/

 

by: jhildenPosted on 2005-02-01 at 09:39:52ID: 13195021

my site lets users upload pictures and view them in an album (just like dotphoto.com and all those).

 I am fine with converting bmps to jpgs but I haven't seen a function for that.  I'll check that library, if there is one that you know works well feel free to post it.

 

by: matt_mcswainPosted on 2005-02-01 at 19:52:01ID: 13199775

Have you tried imagecreatefromgif and imagecopyresized functions instead of imagecopyresampled?
http://us2.php.net/manual/en/function.imagecopyresized.php

 

by: jhildenPosted on 2005-02-02 at 18:15:35ID: 13210222

I've tried both of those with no avail.  Any other suggestions?

 

by: matt_mcswainPosted on 2005-02-02 at 21:52:44ID: 13211073

Hmm, it was worth a shot.
I would be shocked if this didn't work though.
You'll have to install ImageMagick, if you don't already have it, but it's better anyway.
-->http://www.imagemagick.org/

$dir = '.';
if ($dp = opendir($dir)) {
     echo '<table>';
     while (($file = readdir($dp)) !== false) {
          if (strchr($file,'.') == '.bmp' && !strstr($file,'thumb_')) {
                $thumb_name = 'thumb_'.$file.'.bmp';
            echo '<tr><td><img src="'.$file.'"></td>';
            list($width, $height) = getimagesize($file);
            $newheight = 100;
            $newwidth = (int) (($width*100)/$height);
                $command = 'convert.exe -sample '. $newwidth.'x'.$newheight.' "'.$file.'" "'. $thumb_name.'"';
                exec($command);
            echo '<td><img src="'.$thumb_name.'"></td></tr>';
             }
        } echo '</table>';
    closedir($dp);
}

This script scans current directory for .bmp files and create thumbnails and displays side-by-side w/ original

 

by: kshitij_ahujaPosted on 2006-01-08 at 04:09:05ID: 15641333

No comment has been added to this question in more than 21 days,so it is now classified as abandoned..
I will leave the following recommendation for this question in the Cleanup topic area:
[Accept matt_mcswain 's comment]

Any objections should be posted here in the next 4 days. After that time, the question will be closed.

Kshitij Ahuja
EE Cleanup Volunteer

20120131-EE-VQP-002

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