Rotate Images

[owner]

Hello,

 

I am trying to rotate my images using imagerotate (part of GD Library) but for some crazy reason, it doesn't seem to want to rotate gif or png images.  I don't get any errors while trying to rotate the images as well.  Here is the code I am using to try and rotate a png image.

 

// Load
$source = imagecreatefrompng('myimagetorotate.png');

// Rotate 90 Degrees
$rotate = imagerotate($source, 90, 0);

// Output
imagepng($source,'myimagetorotate.png', 0, NULL);

 

Like I said, I can rotate a jpg/jpeg image perfectly using this code (using imagecreatefromjpeg and imagejpeg respectfully)

 

Thanks in advance!

[teamatomic]

I seem to remember from messing with this a while back that is you specify NULL you will also need to set a filter. Maybe something like:

imagepng($source,'myimagetorotate.png', 0, PNG_NO_FILTER, NULL);

 

 

HTH

Teamatomic

[owner]

Wrong parameter count for imagepng() in index.php

 

Here is the syntax

bool imagepng  ( resource $image  [, string $filename  [, int $quality  [, int $filters  ]]] )

 

I tried

 

PNG_FILTER_NONE

PNG_NO_FILTER

 

for the filter, but no luck

 

 

[The Little Guy]

I had this problem once, it was because the old image was still cached... do Ctrl+F5 to refresh and clear cache...

[owner]

Still not rotated lol

[The Little Guy]

The following should take the original and overwrite the original:

 

$filename = 'somefile.gif';
$degree = 90;
$source = imagecreatefromgif($filename);
$rotate = imagerotate($source, $degree, 0);

$colorTransparent = imagecolortransparent($source);
imagefill($rotate, 0, 0, $colorTransparent);
imagecolortransparent($source, $colorTransparent);
imagegif($rotate, $filename);

[owner]

I am not very familiar with these three functions:

imagecolortransparent($source);

imagefill($rotate, 0, 0, $colorTransparent);

imagecolortransparent($source, $colorTransparent);

 

Will this preserve transparent backgrounds if present?

 

 

[The Little Guy]

I am not very familiar with these three functions:

imagecolortransparent($source);

imagefill($rotate, 0, 0, $colorTransparent);

imagecolortransparent($source, $colorTransparent);

 

Will this preserve transparent backgrounds if present?

 

Yup!

[owner]

Would it be necessary to call the imagedestroy function?

 

imagedestroy($rotate);

 

Sorry for all the questions

owner

[The Little Guy]

you can if you want...

 

php should destroy it automatically once the script finishes.

 

If you are doing it to more than one image at a time I would destroy the resource for each image when your done with it.

 

I am not sure if you can destroy the $rotate or not I'm fairly sure you can't...

[owner]

Here is the final source code.  Seems to work flawless

 

$source = imagecreatefrompng('image.png');			

$rotate = imagerotate($source, $rotationD, 0);

$colorTransparent = imagecolortransparent($source);
imagefill($rotate, 0, 0, $colorTransparent);
imagecolortransparent($source, $colorTransparent);
imagepng($rotate, 'image.png');

imagedestroy($rotate);

 

Thank you very much!!!