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Image manipulation and watermarking in PHP with GD2

Published on 11/16/2009 by Dotnetindex
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The following functions are what I usually use to handle images in my projects. We’ve got reScaleImage which will resize and save an image, keeping aspect ratio.

We’ve got constrainImage which will only get new width and height for an image if it is to be scaled using constraints in both x and y. Let’s pretend we’ve got an image that’s 1000×500 and pass its filename and 500 and 500 as constraints on x and y. It should then return 500×250. This function will not actually do anything with the image itself, only get the new dimensions.

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