Getting and using binary image data from ImageMagick

[Chuck Anderson]

I am trying to use ImageMagick to create thumbnails on the fly - without
having to save the image to a file.

I have gotten it to work by using passthru($cmd, $retval), but I want to
use something else that will give me the complete output returned as a
string that I can convert to a GD lib image resource so I can verify the
operation worked before sending the Content-type header for the image.

This works:
---------------------------------------------------------
// $photo = path to image file
$cmd = "convert.ex e -size 250x250 \"$photo\"" .
' -resize 125x125' .
' -strip' .
' -unsharp 0.2x0.6+1.0' .
' -quality 87 JPG:-';

header("Content-type: image/jpeg");
passthru($cmd, $retval);
---------------------------------------------------------

Using this, the resized image is displayed in my browser.

However, I would rather get the binary output from ImageMagick into a
variable and then test retval (or use some other method) to determine if
the operation was successful.

I've tried shell_exec ...
$output = shell_exec($cmd );
.... but the data in $output appears truncated (ÿØÿà�JFIF� ,,ï¿½ï¿½Ã¿Ã›ï¿ ½C�
- is all there is ). ??

Has anyone done anything like this? Any suggestions?

--
*************** **************
Chuck Anderson • Boulder, CO

http://www.CycleTourist.com

*************** **************

[petersprc]

Re: Getting and using binary image data from ImageMagick

You can use this code, but change the command:

http://groups.google.com/group/comp.lang.php/browse_thread/thread/add9df907a8fb755/58cf2cff276c5003?rnum=1#58cf2cff276c5003

That will only print the header if the command starts generating good
output.

By the way, for a generic resize script with more options and file
caching, use:

http://phpthumb.sourceforge.net/

On Jul 19, 1:30 am, Chuck Anderson <websiteaddr... @seemy.sigwrote :

I am trying to use ImageMagick to create thumbnails on the fly - without
having to save the image to a file.
>
I have gotten it to work by using passthru($cmd, $retval), but I want to
use something else that will give me the complete output returned as a
string that I can convert to a GD lib image resource so I can verify the
operation worked before sending the Content-type header for the image.
>
This works:
---------------------------------------------------------
// $photo = path to image file
$cmd = "convert.ex e -size 250x250 \"$photo\"" .
' -resize 125x125' .
' -strip' .
' -unsharp 0.2x0.6+1.0' .
' -quality 87 JPG:-';
>
header("Content-type: image/jpeg");
passthru($cmd, $retval);
---------------------------------------------------------
>
Using this, the resized image is displayed in my browser.
>
However, I would rather get the binary output from ImageMagick into a
variable and then test retval (or use some other method) to determine if
the operation was successful.
>
I've tried shell_exec ...
$output = shell_exec($cmd );
... but the data in $output appears truncated (ÿØÿà?JFIF? ,,??ÿÛ?C?
- is all there is ). ??
>
Has anyone done anything like this? Any suggestions?
>
--
*************** **************
Chuck Anderson · Boulder, CO

http://www.CycleTourist.com

*************** **************

[Chuck Anderson]

Re: Getting and using binary image data from ImageMagick

petersprc wrote:

You can use this code, but change the command:
>

http://groups.google.com/group/comp.lang.php/browse_thread/thread/add9df907a8fb755/58cf2cff276c5003?rnum=1#58cf2cff276c5003

>
That will only print the header if the command starts generating good
output.
>

Thanks. (I take it that's yours.) It'll take me a little while to wrap
my head around that, but I will.

By the way, for a generic resize script with more options and file
caching, use:
>

http://phpthumb.sourceforge.net/

>

Some things I like doing myself, but that sure is a robust,
all-encompassing thumbnail generator. I think it does, too much.

Thanks,
Chuck

On Jul 19, 1:30 am, Chuck Anderson <websiteaddr... @seemy.sigwrote :
>

>I am trying to use ImageMagick to create thumbnails on the fly - without
>having to save the image to a file.
>>
>I have gotten it to work by using passthru($cmd, $retval), but I want to
>use something else that will give me the complete output returned as a
>string that I can convert to a GD lib image resource so I can verify the
>operation worked before sending the Content-type header for the image.
>>
>This works:
>---------------------------------------------------------
>// $photo = path to image file
>$cmd = "convert.ex e -size 250x250 \"$photo\"" .
> ' -resize 125x125' .
> ' -strip' .
> ' -unsharp 0.2x0.6+1.0' .
> ' -quality 87 JPG:-';
>>
>header("Conten t-type: image/jpeg");
>passthru($cm d, $retval);
>---------------------------------------------------------
>>
>Using this, the resized image is displayed in my browser.
>>
>However, I would rather get the binary output from ImageMagick into a
>variable and then test retval (or use some other method) to determine if
>the operation was successful.
>>
>I've tried shell_exec ...
>$output = shell_exec($cmd );
>... but the data in $output appears truncated (ÿØÿà?JFIF? ,,??ÿÛ?C?
>- is all there is ). ??
>>
>Has anyone done anything like this? Any suggestions?
>>
>--
>************** ***************
> Chuck Anderson · Boulder, CO
> http://www.CycleTourist.com
>************** ***************
>>

>
>
>

--
*************** **************
Chuck Anderson • Boulder, CO

http://www.CycleTourist.com

Everyone's journey should be different,
so that we all are enriched
in new and endless ways
*************** **************