First you must have an upload form in your HTML, notice that the file input field in the form below is profile_pic

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In Controller, create an instance of DooGdImage, along with the upload/source path and the path to save your resized pictures:

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Doo::loadHelper(‘DooGdImage’);
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//upload/source path, and output saved path
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$gd = new DooGdImage(‘/var/www/uploaded/’, ‘/var/www/resized_pic/’);
Call uploadImage() to save the uploaded file with a new name. The example below save the picture with the date as file name, img_20100104203245.jpg

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$uploadImg = $gd->uploadImage(‘profile_pic’, ‘img_’ .date(‘Ymdhis’));
Before your resize the picture, you can set the quality, generated image type and file name suffix (optional)

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$gd->generatedQuality = 85;
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$uploadImage->generatedType=”jpg”;
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//This thumbnail is 46×46 pixels, resize adaptively (perfect 46×46 crop from center)
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//Pic name is img_201001011200_46x46.jpg
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$gd->thumbSuffix = ‘_46x46’;
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$gd->adaptiveResize($uploadImg,46,46);
You can use createThumb/createSquare to resize the pictures too.

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//Resize propotionally (so will not be perfect 75×75 depends on the image ratio, no cropping done)
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//Pic name is img_201001011200_75x75.jpg
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$gd->thumbSuffix = ‘_75x75’;
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$gd->createThumb($uploadImg, 75, 75);
Some updates*

You can validate if the uploaded images meet your requirements by using checkImageType(), checkImageSize() and checkImageExtension()

checkImageType() – check if image mime type is in the allowed list. Default: JPEGs, GIFs and PNGs
checkImageExtension() – check if image file extension is in the allowed list.