Limitations and imagecopyresampled vs imagecopyresized

[PEJAS]

 

I have used the script below to upload and resize images.

 

I have noticed some kinde of LIMITATIONS...

 

• imagecopyresampled & imagecopyresized >>>

     - image size 3.638 x 3.139 px works fine but not 3.639 x 3.139 or 3.638 x 3.140 px

     - image size 3.874 x 2.996 px works fine but not 3.875 x 2.996 or 3.874 x 2.997 px

     - image size 3.335 x 3.335 px is the largest Square images possible to upload

     and all this is independent of filsize in kb

 

Is there any way to calculate the this limitations? As 3.874x2.996 > 3.638x3.139 this dosen't make any sense 

As I get the same result with both imagecopyresampled and imagecopyresized what are the real difference?

 

thanks for all help.

 

=== SCRIPT ================================================================

//Create image from file

$uploadedfile = $_FILES['file']['tmp_name'];

$src = imagecreatefromjpeg($uploadedfile);

 

// Set a maximum height and width

$newwidth = 1280;

$newwidth1 = 700;

$newwidth2 = 120;

$newheight = 1280;

$newheight1 = 700;

$newheight2 = 120;

 

// Get new dimensions

list($width,$height)=getimagesize($uploadedfile);

 

// Set imageratio

$ratio = $width/$height;

 

// Set new sizes

if ($newwidth/$newheight > $ratio) {

  $newwidth = $newheight*$ratio;

  $newwidth1 = $newheight1*$ratio;

  $newwidth2 = $newheight2*$ratio;

} else {

  $newheight = $newwidth/$ratio;

  $newheight1 = $newwidth1/$ratio;

  $newheight2 = $newwidth2/$ratio;

}

 

// Resample  Resize

$tmp = imagecreatetruecolor($newwidth, $newheight);

$tmp1= imagecreatetruecolor($newwidth1, $newheight1);

$tmp2= imagecreatetruecolor($newwidth2, $newheight2);

 

//imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);

//imagecopyresampled($tmp1,$src,0,0,0,0,$newwidth1,$newheight1,$width,$height);

//imagecopyresampled($tmp2,$src,0,0,0,0,$newwidth2,$newheight2,$width,$height);

 

imagecopyresized($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);

imagecopyresized($tmp1,$src,0,0,0,0,$newwidth1,$newheight1,$width,$height);

imagecopyresized($tmp2,$src,0,0,0,0,$newwidth2,$newheight2,$width,$height);

 

//Save  files to folders

$filename = "images/". $_FILES['file']['name'];

$filename1 = "images/small/". $_FILES['file']['name'];

$filename2 = "images/thumbnail/". $_FILES['file']['name'];

 

magejpeg($tmp,$filename,100);

imagejpeg($tmp1,$filename1,100);

imagejpeg($tmp2,$filename2,100);

 

// Delete tempfiles

imagedestroy($src);

imagedestroy($tmp);

imagedestroy($tmp1);

imagedestroy($tmp2);

=== SCRIPT ================================================================

 

 

[PEJAS]

Sorry pushed the wrong button!

[BlueSkyIS]

first, i assume that your measurements are in inches, not pixels. as 3.638 x 3.139 px doesn't make sense. (or are you using a . as thousands separator?)

 

anyway: the issue probably comes down to RAM. 2 images of the same pixel dimensions will not necessarily have the same file size. In fact, it would be very rare where 2 different images of the same pixel dimensions have the exact same file size. beyond pixel x pixel, there is the issue of color: how many colors and how much variation of colors from pixel to pixel. a 500 x 500 pixel image of a polar bear in a snowstorm would be far smaller than a 500 x 500 pixel image of the Mona Lisa.

 

in the end, the limit is probably the max memory allowed in php.ini and/or the max available on your server.