ColdFusion Developer's Guide

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Enforcing size restrictions
ColdFusion provides several functions for retrieving information associated with images,
including the height and width of an image. For example, you can use the ImageGetWidth
and ImageGetHeight functions to determine whether an image is too large to upload to a
website or database.
The following example shows how to prevent users from uploading images that are greater
than 300 pixels wide or 300 pixels high:
The image you uploaded was too big. It must be less than 300 pixels
wide and 300 pixels high. Your image was #imageGetWidth(myImage)# pixels
wide and #imageGetHeight(myImage)# pixels high.
For information about retrieving image metadata, see the ImageGetEXIFTag,
ImageGetIPTCTag, and ImageInfo functions in the CFML Reference.
Compressing JPEG images
To reduce the size of large files, you can convert a JPEG file to a lower quality image by using
the write action of the cfimage tag. Specify a value between 0 (low) and 1 (high) for the
quality attribute, as the following example shows:
You can perform the same operation by using the ImageWrite function:
1094 Creating and Manipulating ColdFusion Images