Using CFIMAGE to Watermark an Image - Coldfusion tutorial

Category: Coldfusion tutorials - Difficulty:

Hidden frames and JavaScript

ColdFusion makes it easy to select data out of a database and display it on a page. As soon as you feel good about your success in crossing the divide from static to dynamic, someone will say "That's nice, can you group the list by author?". Whether you are asked to group things by author, make, brand, year or whatever, ColdFusion has you covered with its grouping capabilities.

For anyone new to application development, you may be perplexed when you create your form for editing some data that should allow a user to uncheck a checkbox and update a record to a status of not checked. You will sooner or later discover an oddity about HTML forms. HTML forms won't allow you to uncheck like you think you should be able to. If you uncheck the checkbox, the value becomes NULL and the form doesn't bother to pass the field. You will find that ColdFusion does have a simple solution and much more with the CFPARAM tag.

As a newbie, you can expect to hear comments about "newbie tags". You may hear "Oh, I'd never use CFINSERT or CFUPDATE, I only use SQL within CFQUERY". If you follow a discussion on this you won't see any strong technical cases against them and when I've pushed the discussion, it ends up being admitted that problems haven't been seen since 4.5 but "SQL is much more flexible and powerful".

Using Coldfusion 8 and CFIMAGE to add Watermarks to Images on the fly.