Image Verification Snippets


How to display visitors IP in an Image using PHP

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05 December, 2012   

Instead of providing a traditional address to the image, the image file data is base64-encoded and stuffed within the src attribute. Doing so saves a network request for each image, and prevent exposure of directory paths. Please note that IE7 and below are not compatibles with data URIs.

Essentially the trick is to draw the panel/frame/etc.

Essentially the trick is to draw the panel/frame/etc. into a BufferedImage and use the ImageIO class to write it to an image file.

28 January, 2013   

Save a screen capture of a Java Frame/Panel/Window

15 April, 2012   

PHP code example for an image CAPTCHA.

I had to scan a bunch of paper documents (one image per page), and upload them all to a web site that would accept only one PDF file containing the whole set.

02 June, 2011   

This is your most basic version of an image CAPTCHA.

Java code example to create thumbnail of an image

18 February, 2012   

CSS code example for a background image repeat vertically (y-axis), horizontally (x-axis), in both directions, or in neither direction.

This PHP script will get the day of the week from the server date and then display an image (jpg or gif) to match.

16 March, 2011   

Take an image, and put a water mark on top of it. Note that you can only use this function once per page.

19 April, 2011   

This snippet shows how to get the thumbnail from exif metadata. This is very useful for generating very fast thumbnails!! I hope many would benefit from this.

08 December, 2012   

Full screen background image using pure CSS3.

13 February, 2013   

PHP Code example for ASCII CAPTCHA

04 May, 2011   

Take a JPG image, and convert it to ASCII code!

CSS Code example : how to repeat a background image only horizontally.

08 February, 2012   

CSS code example for Image Preloading

09 January, 2013   

Better way to handle Broken Image. Missing images will either just display nothing, or display a [ ? ] style box.

This technical tip shows how to read the image and mark all the barcode regions, for all the recognized barcodes in the image. The barcode region is the part of the image that only contains the barcode itself. In a large image, it is possible that there are other texts or images along with the barcode. Getting the barcode region will separate...