CFImage Presentation Outline

I gave a presentation on ColdFusion 8's CFIMAGE tag, Image Functions, and Foundeo's CFImage Effects Component yesterday to the Albany, NY CFUG.

I have made the code samples & slides available online. Feel free to use this presentation at your local CFUG, just take note of the terms of use on the aforementioned link.

CFIMAGE & Image Functions Presentation Outline

Image Procesing in ColdFusion 8

• CFIMAGE has 9 different actions
• Over 50 Image functions were added to CF8

Action attribute values for CFIMAGE tag

• border - add a border to an image
• captcha - creates a captcha image (see below)
• convert - convert a jpg to a png, etc.
• info - returns a structure of image info, such as height & width
• read - reads an image and stores it in an image object variable
• resize - resizes an image to a specified height and width
• rotate - rotates an image given an angle
• write - writes an image object to a file
• writeToBrowser - serves the image dynamically using a HMTL img tag.

Example: Resize an Image

<cfimage action="resize" source="sourceFile" destination="destFile" height="num" width="num">

Code Example 1: Resize an Uploaded Image

See source code download above.

Suppose you only wanted to resize big images

You need to know the height and width

Get Image Info using CFIMAGE

<cfimage action="info" source="filePath" structName="variableName">
<cfdump var="#variableName#">

Code Example 2: Image Info

See source code download above.

Code Example 3: Conditionally Resize an Image

See source code download above.

CAPTCHA Codes

Stands for: Completely Automated Public Turing test to tell Computers and Humans Apart

• Used to detect spam in web forms (blog comments or registration pages)
• Displays text in an image. Attempts to be hard for a computer to process using image to text OCR algorithms. Also hard for humans to read!
• CAPTCHA's don't meet accessibility standards

<cfimage action="captcha" text="anything" width="50" height="300">

Code Example 4: CAPTCHA Images Generated with CFIMAGE

See source code download above.

Code Example 5: CAPTCHA Form Example

This example shows how to code a form using captcha's, see the code download link above.

Image Functions in ColdFusion 8

You can do things like:

• Create Blank Images from Scratch
• Draw Shapes & Lines on an Image
• Add Text to an image
• Overlay one image on to another image, or put images side by side.
• Crop, Flip, Blur, Grayscale, Invert, Rotate, etc.
• Get EXIF & IPTC Image Metadata

Code Example 6: Build a button from scratch using Image Functions

See source code download above

But what if you wanted...

• Gradients
• Rounded Corners
• iTunes Reflection Effect
• Drop Shadows
• And More...

Then you need Foundeo's CFImage Effects!

Finished up with a demo of CFImage Effects.