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Apply a thumbnail crop to a larger image

 
This forum is locked: you cannot post, reply to, or edit topics.   This topic is locked: you cannot edit posts or make replies.    php.amnuts.com Forum Index -> Crop Canvas
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RickWeb
Newbie


Joined: 20 Apr 2006
Posts: 1

PostPosted: Thu Apr 20, 2006 7:13 am    Post subject: Apply a thumbnail crop to a larger image Reply with quote

Hi,

I want to be able to crop a lowres jpeg thumbnail on screen and apply that crop to a much larger copy of the same image.

Is this possible and if it is any pointers would be gratefully received.

I already have the crop canvas system running fine on the low res image.

Thanks
Rick Confused
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amnuts
Site Admin


Joined: 01 Sep 2002
Posts: 662
Location: East Sussex, England

PostPosted: Fri Apr 28, 2006 10:12 am    Post subject: Reply with quote

Hi and welcome to the board!

It should just be a matter of percentages...

When you submit the form to make a crop it passes along for important bits of information; the start x/y position (top left) of the crop and the end x/y position (bottom right) of the crop. For example:

sx=45
sy=58
ex=457
ey=346

Assuming the large image was twice as large as the one you cropped, double the figures about to get your cropping area. If it was three times large then multiply them by three, etc. Once you have the new dimensions, use them to make the crop to your large image.

Andy
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