Question on using GD in PHP to size/resize images

[eholz1]

Hello PHP group,

I am using some php code to check the size of images, and then
resize or determine new dimension for the image. GD seems quite slow.
It takes about 5 seconds (plus or minus) to calulate dimension for 7
jpeg images.

I have a 700mhz processor (Pentium III, remember those??)! with almost
a gb of memory.
Is that the way GD is??? Here is a snippet of the dode I use: I pass
the image from an array to this function:

function imageDimensions ($img) {

//get size create an original image from file above

$orig = imagecreatefromjpeg($img);

if ($orig) {

//get height and width

$orig_x = imagesx($orig);

$orig_y = imagesy($orig);

$pic_size[0] = $orig_x; //width

$pic_size[1] = $orig_y; //height
if ($orig_x 799) {

$image_x = 800;
}else{
$image_x = $orig_x;
}

// $thumb_x = $_REQUEST['thumb_x'];

$image_y = round(($orig_y * $image_x) / $orig_x);

// $thumb_y = round(($orig_y * $thumb_x) / $orig_x);

$pic_size[2] = $image_y;

$pic_size[3] = $image_x;

return $pic_size;

//echo("Image width: " . $orig_x . ". Image height: " . $orig_y);

} else {

echo 'No Image!';

}

}
I am open to any suggestions on improving my "code" as it were!

Thanks for a good group,
eholz1

[Curtis]

If you're trying to make thumbnails, you should actually resample the
images, otherwise, your web page will take a while to load, even if you
change the dimensions in the image tag.

See: http://php.net/manual/en/function.im...yresampled.php

On Jan 5, 10:01 pm, "eholz1" <[e-mail]:

Hello PHP group,

I am using some php code to check the size of images, and then
resize or determine new dimension for the image. GD seems quite slow.
It takes about 5 seconds (plus or minus) to calulate dimension for 7
jpeg images.

I have a 700mhz processor (Pentium III, remember those??)! with almost
a gb of memory.
Is that the way GD is??? Here is a snippet of the dode I use: I pass
the image from an array to this function:

function imageDimensions ($img) {

//get size create an original image from file above

$orig = imagecreatefromjpeg($img);

if ($orig) {

//get height and width

$orig_x = imagesx($orig);

$orig_y = imagesy($orig);

$pic_size[0] = $orig_x; //width

$pic_size[1] = $orig_y; //height
if ($orig_x 799) {

$image_x = 800;
}else{
$image_x = $orig_x;
}

// $thumb_x = $_REQUEST['thumb_x'];

$image_y = round(($orig_y * $image_x) / $orig_x);

// $thumb_y = round(($orig_y * $thumb_x) / $orig_x);

$pic_size[2] = $image_y;

$pic_size[3] = $image_x;

return $pic_size;

//echo("Image width: " . $orig_x . ". Image height: " . $orig_y);

} else {echo 'No Image!';

}
}I am open to any suggestions on improving my "code" as it were!

Thanks for a good group,
eholz1

[Geoff Berrow]

Message-ID: <11**********************@v33g2000cwv.googlegroups .comfrom
eholz1 contained the following:

>I am using some php code to check the size of images, and then
resize or determine new dimension for the image. GD seems quite slow.
It takes about 5 seconds (plus or minus) to calulate dimension for 7
jpeg images.

You don't need GD to get image sizes
http://uk2.php.net/manual/en/function.getimagesize.php

--
Geoff Berrow (put thecat out to email)
It's only Usenet, no one dies.
My opinions, not the committee's, mine.
Simple RFDs http://www.ckdog.co.uk/rfdmaker/

[Michael Austin]

Geoff Berrow wrote:

Message-ID: <11**********************@v33g2000cwv.googlegroups .comfrom
eholz1 contained the following:

>>I am using some php code to check the size of images, and then
resize or determine new dimension for the image. GD seems quite slow.
It takes about 5 seconds (plus or minus) to calulate dimension for 7
jpeg images.

You don't need GD to get image sizes
http://uk2.php.net/manual/en/function.getimagesize.php

if you are doing thumbnails you need neither.

<a href='<?php echo $path ?>'>
<img src='<?php echo $imagelist[$i] ?>' width='50' height='50' class='thumb'>

I found this in a php script called imagebrowser.php (a google search should
locate it...)

--
Michael Austin.
Database Consultant

[Jerry Stuckle]

Michael Austin wrote:

Geoff Berrow wrote:

>Message-ID: <11**********************@v33g2000cwv.googlegroups .comfrom
eholz1 contained the following:

>>I am using some php code to check the size of images, and then
resize or determine new dimension for the image. GD seems quite slow.
It takes about 5 seconds (plus or minus) to calulate dimension for 7
jpeg images.

You don't need GD to get image sizes
http://uk2.php.net/manual/en/function.getimagesize.php

if you are doing thumbnails you need neither.

<a href='<?php echo $path ?>'>
<img src='<?php echo $imagelist[$i] ?>' width='50' height='50'
class='thumb'>

I found this in a php script called imagebrowser.php (a google search
should locate it...)

And this is exactly what yous should NOT do. It causes the entire
(large) image to load, then be resized by the browser.

It is much better to create thumbnails and send an image of the
appropriate size. Depending on the original image size, the size
difference is enormous. For instance, if the original image size is
500x500, your thumbnail may be as much as 99% smaller than the original.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attglobal.net
==================

[eholz1]

Hello Curtis and the others,

This is exactly what I needed. I am doing some testing with images,
etc. My plan is to read/check a
given image file, and load its name, size, filetype, etc into a
database, and display the image (via a thumbnail link, etc). So the
link to the php stuff is very useful, and all i need at this point is
to get image data, and do not need to process image yet (like make a
thumbnail, resize image to browser size (maybe 900 x 600, etc).

Thanks again,

eholz1,

Curtis wrote:

If you're trying to make thumbnails, you should actually resample the
images, otherwise, your web page will take a while to load, even if you
change the dimensions in the image tag.

See: http://php.net/manual/en/function.im...yresampled.php

On Jan 5, 10:01 pm, "eholz1" <[e-mail]:

Hello PHP group,

I am using some php code to check the size of images, and then
resize or determine new dimension for the image. GD seems quite slow.
It takes about 5 seconds (plus or minus) to calulate dimension for 7
jpeg images.

I have a 700mhz processor (Pentium III, remember those??)! with almost
a gb of memory.
Is that the way GD is??? Here is a snippet of the dode I use: I pass
the image from an array to this function:

function imageDimensions ($img) {

//get size create an original image from file above

$orig = imagecreatefromjpeg($img);

if ($orig) {

//get height and width

$orig_x = imagesx($orig);

$orig_y = imagesy($orig);

$pic_size[0] = $orig_x; //width

$pic_size[1] = $orig_y; //height
if ($orig_x 799) {

$image_x = 800;
}else{
$image_x = $orig_x;
}

// $thumb_x = $_REQUEST['thumb_x'];

$image_y = round(($orig_y * $image_x) / $orig_x);

// $thumb_y = round(($orig_y * $thumb_x) / $orig_x);

$pic_size[2] = $image_y;

$pic_size[3] = $image_x;

return $pic_size;

//echo("Image width: " . $orig_x . ". Image height: " . $orig_y);

} else {echo 'No Image!';

}
}I am open to any suggestions on improving my "code" as it were!

Thanks for a good group,
eholz1

[eholz1]

Hello Jerry,

I love your posts!!!

Thanks,

ehozl1
Jerry Stuckle wrote:

Michael Austin wrote:

Geoff Berrow wrote:

Message-ID: <11**********************@v33g2000cwv.googlegroups .comfrom
eholz1 contained the following:
I am using some php code to check the size of images, and then
resize or determine new dimension for the image. GD seems quite slow.
It takes about 5 seconds (plus or minus) to calulate dimension for 7
jpeg images.

You don't need GD to get image sizes
http://uk2.php.net/manual/en/function.getimagesize.php

if you are doing thumbnails you need neither.

<a href='<?php echo $path ?>'>
<img src='<?php echo $imagelist[$i] ?>' width='50' height='50'
class='thumb'>

I found this in a php script called imagebrowser.php (a google search
should locate it...)

And this is exactly what yous should NOT do. It causes the entire
(large) image to load, then be resized by the browser.

It is much better to create thumbnails and send an image of the
appropriate size. Depending on the original image size, the size
difference is enormous. For instance, if the original image size is
500x500, your thumbnail may be as much as 99% smaller than the original.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attglobal.net
==================

[eholz1]

One last question,

In terms of making thumbnails, resizing images, etc are there any other
programs that work better
(whatever "better" means) than GD??? I have a version of gallery
(menalto opensource program) and it seems to like netpbm, ImageMagik,
etc. are either of these better or faster, etc. Or are they more or
less equal??? My goal is to check size of original image (typically
3000px by 3072 px) and make a thumbnail, and resize the "big" image to
appropriate browser size (a poor man's gallery program).
and when a viewer clicks the thumbnail, display the bigger image via
php in browser.

eholz1

eholz1 wrote:

Hello Jerry,

I love your posts!!!

Thanks,

ehozl1
Jerry Stuckle wrote:

Michael Austin wrote:

Geoff Berrow wrote:
>
>Message-ID: <11**********************@v33g2000cwv.googlegroups .comfrom
>eholz1 contained the following:
>>
>>
>>I am using some php code to check the size of images, and then
>>resize or determine new dimension for the image. GD seems quite slow.
>>It takes about 5 seconds (plus or minus) to calulate dimension for 7
>>jpeg images.
>>
>>
>>
>You don't need GD to get image sizes
>http://uk2.php.net/manual/en/function.getimagesize.php
>>
>
if you are doing thumbnails you need neither.
>
<a href='<?php echo $path ?>'>
<img src='<?php echo $imagelist[$i] ?>' width='50' height='50'
class='thumb'>
>
I found this in a php script called imagebrowser.php (a google search
should locate it...)
>

And this is exactly what yous should NOT do. It causes the entire
(large) image to load, then be resized by the browser.

It is much better to create thumbnails and send an image of the
appropriate size. Depending on the original image size, the size
difference is enormous. For instance, if the original image size is
500x500, your thumbnail may be as much as 99% smaller than the original.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attglobal.net
==================

[Andy Hassall]

On 6 Jan 2007 09:18:15 -0800, "eholz1" <ew****@gmail.comwrote:

>In terms of making thumbnails, resizing images, etc are there any other
programs that work better
(whatever "better" means) than GD??? I have a version of gallery
(menalto opensource program) and it seems to like netpbm, ImageMagik,
etc. are either of these better or faster, etc. Or are they more or
less equal??? My goal is to check size of original image (typically
3000px by 3072 px) and make a thumbnail, and resize the "big" image to
appropriate browser size (a poor man's gallery program).
and when a viewer clicks the thumbnail, display the bigger image via
php in browser.

ImageMagick is generally more suited to processing photographic images; GD is
mostly for computer-generated "block" graphics. ImageMagick is also somewhat
faster for image processing (resize etc.) and can give subjectively better
results as there's many options for filters and convolutions.

See also http://groups.google.co.uk/group/com...76e8f1a175b4ed

The downside is that (a) it has to be installed in the first place and (b) you
may need to shell out to the "convert" command, although there are a couple of
PHP APIs that give you direct access to the ImageMagick API.

--
Andy Hassall :: an**@andyh.co.uk :: http://www.andyh.co.uk
http://www.andyhsoftware.co.uk/space :: disk and FTP usage analysis tool

[eholz1]

Hello Andy,

Thanks for the info. I do have both netpbm and ImageMagik installed on
my "test" server, so that is ok.
I can convert images, and them move them to my production web site.
Thanks again,

ewholz

(how come all the image stuff seems to come from the UK???, I guess no
one uses it in the US :)
Andy Hassall wrote:

On 6 Jan 2007 09:18:15 -0800, "eholz1" <ew****@gmail.comwrote:

In terms of making thumbnails, resizing images, etc are there any other
programs that work better
(whatever "better" means) than GD??? I have a version of gallery
(menalto opensource program) and it seems to like netpbm, ImageMagik,
etc. are either of these better or faster, etc. Or are they more or
less equal??? My goal is to check size of original image (typically
3000px by 3072 px) and make a thumbnail, and resize the "big" image to
appropriate browser size (a poor man's gallery program).
and when a viewer clicks the thumbnail, display the bigger image via
php in browser.

ImageMagick is generally more suited to processing photographic images; GD is
mostly for computer-generated "block" graphics. ImageMagick is also somewhat
faster for image processing (resize etc.) and can give subjectively better
results as there's many options for filters and convolutions.

See also http://groups.google.co.uk/group/com...76e8f1a175b4ed

The downside is that (a) it has to be installed in the first place and (b) you
may need to shell out to the "convert" command, although there are a couple of
PHP APIs that give you direct access to the ImageMagick API.

--
Andy Hassall :: an**@andyh.co.uk :: http://www.andyh.co.uk
http://www.andyhsoftware.co.uk/space :: disk and FTP usage analysis tool

[Jerry Stuckle]

eholz1 wrote:

One last question,

In terms of making thumbnails, resizing images, etc are there any other
programs that work better
(whatever "better" means) than GD??? I have a version of gallery
(menalto opensource program) and it seems to like netpbm, ImageMagik,
etc. are either of these better or faster, etc. Or are they more or
less equal??? My goal is to check size of original image (typically
3000px by 3072 px) and make a thumbnail, and resize the "big" image to
appropriate browser size (a poor man's gallery program).
and when a viewer clicks the thumbnail, display the bigger image via
php in browser.

eholz1

eholz1 wrote:

>>Hello Jerry,

I love your posts!!!

Thanks,

ehozl1
Jerry Stuckle wrote:

>>>Michael Austin wrote:

Geoff Berrow wrote:
>Message-ID: <11**********************@v33g2000cwv.googlegroups .comfrom
>eholz1 contained the following:
>
>
>
>>I am using some php code to check the size of images, and then
>>resize or determine new dimension for the image. GD seems quite slow.
>>It takes about 5 seconds (plus or minus) to calulate dimension for 7
>>jpeg images.
>
>
>
>You don't need GD to get image sizes
>http://uk2.php.net/manual/en/function.getimagesize.php
>

if you are doing thumbnails you need neither.

<a href='<?php echo $path ?>'>
<img src='<?php echo $imagelist[$i] ?>' width='50' height='50'
class='thumb'>

I found this in a php script called imagebrowser.php (a google search
should locate it...)
And this is exactly what yous should NOT do. It causes the entire
(large) image to load, then be resized by the browser.

It is much better to create thumbnails and send an image of the
appropriate size. Depending on the original image size, the size
difference is enormous. For instance, if the original image size is
500x500, your thumbnail may be as much as 99% smaller than the original.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attglobal.net
==================

I agree with Andy. ImageMagick is the best way to go, if you can
install it.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attglobal.net
==================

[Geoff Berrow]

Message-ID: <11**********************@51g2000cwl.googlegroups. comfrom
eholz1 contained the following:

>
In terms of making thumbnails, resizing images, etc are there any other
programs that work better
(whatever "better" means) than GD??? I have a version of gallery
(menalto opensource program) and it seems to like netpbm, ImageMagik,
etc. are either of these better or faster, etc. Or are they more or
less equal??? My goal is to check size of original image (typically
3000px by 3072 px) and make a thumbnail, and resize the "big" image to
appropriate browser size (a poor man's gallery program).
and when a viewer clicks the thumbnail, display the bigger image via
php in browser.

Done that :-)
www.walkingoutdoors.co.uk/Geoff/gallery/

Code:
http://www.walkingoutdoors.co.uk/Geo...ry/gallery.zip
--
Geoff Berrow (put thecat out to email)
It's only Usenet, no one dies.
My opinions, not the committee's, mine.
Simple RFDs http://www.ckdog.co.uk/rfdmaker/