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Thread ID: 74174 2006-11-13 23:40:00 php - image resize to specific size but keep aspect ratio -- hard to explain Morgenmuffel (187) Press F1
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498855 2006-11-13 23:40:00 Hi all

I am needing to resize images using php

I can do that really easily without problem

But I have now been faced with a problem I can't figure out

I need to resize some images of varying sizes and aspect ratios to fit in a
80 X 80 thumbnail for a flash gallery
now the problem is that the thumbnail must be 80 x 80 any other size will get stretched to fit
So if my initial image is 800 x 600 and i resize it to 80 X 60 the flash gallery will stretch it to 80 x 80 and the thumbnail is distorted looking,

What i need is some sort of function that will ...
resize the image correctly to 80 X 60
then add an 80 x 80 background behind the image so that the image will be saved as a correctly proportion image

Ok I have explained it badly here is an image (nigel.geek.nz)

The one on the left is what is happening the one on the right is what i want 		Morgenmuffel (187)
498856 2006-11-13 23:50:00 here is an image (nigel.geek.nz)

Cute photo.

Ok. Hmmm. I'll try help you if you promise to help my one (kittenwar.com) in the kitten war (http://kittenwar.com/). :D 		Greg (193)
498857 2006-11-14 00:11:00 The simplest process I could think of would be to 1) Resize initial image while maintaining ratio, 2) Add appropriate borders dependent on size - see nz2.php.net for possible donor code there. Hope that's a help anyway :) MyHost (8982)
498858 2006-11-14 00:15:00 Apparently this also does the trick - http://phpthumb.sourceforge.net/

"Thumbnails can be a fixed dimension regardless of source aspect ratio and background filled with configurable color. Border corners can optionally be rounded (independant horizontal & vertical radius)" 		MyHost (8982)
498859 2006-11-14 01:32:00 Hmm that phpThumb looks good Morgenmuffel (187)
498860 2006-11-14 05:24:00 Hmmm... I recall writing something like what you want. I never actually ended up using it, so its probably full of bugs :p

Let me see.....


<?php
/*
$sourceImage = name of the original file that the thumbnail is created from
$targetImage = name of the ouput file
$forcedWidth = constrains the output file to this width
$forcedHeight contrains the output file to this height
$keepWHRatio = Keep Width/Height Ratio. With this turned on, you only have to specify either
height or width, and the other will resize proportianally. (default = true)
I think this is also called Keep Aspect Ration?? If it is, then that would
be a better name for the variable.
$jpegQuality = quality of the jpeg (0 worst, 100 best, default 75 (recommended))
$deleteOriginal = If you want to delete the original, then input a 1 here.
This is for image upload/convert 'on the fly' sort of thing,
and it will delete the image uploaded, and replace it with a new
image according to your settings. (default = false)
*/
function resizeimgtojpeg ($sourceImage, $targetImage, $forcedWidth, $forcedHeight, $keepWHRatio = true, $jpegQuality = 75, $deleteOriginal = false)
{
if(file_exists($sourceImage))
{
if ($keepWHRatio == true)
{
$sourceSize = getimagesize($sourceImage);

// For a landscape picture or a square
if ($sourceSize[0] >= $sourceSize[1])
{
$finalWidth = $forcedWidth;
$finalHeight = ($forcedWidth / $sourceSize[0]) * $sourceSize[1];
}
// For a potrait picture
else
{
$finalWidth = ($forcedHeight / $sourceSize[1]) * $sourceSize[0];
$finalHeight = $forcedHeight;
}
}
else
{
$finalWidth = $forcedWidth;
$finalHeight = $forcedHeight;
}

$sourceID = imagecreatefromstring(file_get_contents($sourceIma ge));
$targetID = imagecreatetruecolor($finalWidth, $finalHeight);
$target_pic = imagecopyresampled($targetID, $sourceID, 0, 0, 0, 0 , $finalWidth, $finalHeight, $sourceSize[0], $sourceSize[1]);
imagejpeg($targetID, $targetImage, $jpegQuality);
imagedestroy($targetID);
imagedestroy($sourceID);

if ($deleteOriginal && file_exists($sourceImage))
{ unlink($sourceImage); }

return true;
}

else { return false; }
}
?>


Don't mock it if its wrong, I am only a learner! 		mejobloggs (264)
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