PHP thumbnail image

Question

I have creating PHP application which takes images with any height and width. It creates 2 different images as follows,
1: thumbnail image (small image) with size 130x130
2: preview image (big image) with 600x400.

How can we decide the height and width of thumbnail & preview image from the height and width of input image?

I have few images with sizes 100x1600, 1024x1024, 316x360.

If i decrease/increase the size of input image most of the time, either any image is streched or compact.

What is the way to find the desired height and width so that thumbnail & preview image looks good?

clarify the question.. Do u want to create 2 type of thumbnails keeping aspect ratio? Provide us your syntax and then only we can help you.. we are not magicians.. — Alfred
– Alfred, Commented Jun 7, 2011 at 13:45

user680786 · Accepted Answer · 2011-06-07 13:39:29Z

1

You need ratio:

$src_ratio = $src_width/$src_height; //ratio of source
$ratio = $width/$height; //ratio of preview
if ($ratio < $src_ratio) $height = $width/$src_ratio;
else $width = $height*$src_ratio+1;

answered Jun 7, 2011 at 13:39

user680786

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Dmitri Gudkov · Accepted Answer · 2011-06-07 13:31:57Z

0

If I understand you correctly, you should use getimagesize() function to get the original size of the image file...

answered Jun 7, 2011 at 13:31

Dmitri Gudkov

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2 Comments

Pradip Over a year ago

I have already used it. My question is how can i find out height & width of thumbnail & preview image. I have images with 160x1600, 1024x1024, 316x360 and so on.

Dmitri Gudkov Over a year ago

according to the task you're creating a app that takes any image and creates thumbs and previews, you should know the sizes, it's impossible to create without knowing the sizes...

Michael Berkowski · Accepted Answer · 2011-06-07 13:32:39Z

0

You need the getimagesize() function.

$attributes = getimagesize($thumbfilename);
var_dump($attributes);

answered Jun 7, 2011 at 13:32

Michael Berkowski

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