Search code examples
coldfusioncoldfusion-10coldfusion-11

ImageScaleToFit() with percentages

I want to scale an image using a scale amount value passed to it from a FORM. The thing is that I'm getting syntax errors.

I have a hidden input in my form like this:

<input type="hidden" name="scale" value="0.16"/>

In my page that processes the image I want it to do this:

<cfset ImageScaleToFit(MyImg, ARGUMENTS.SCALE%, "", "highestQuality")/>

I know the above cfml is not correct but I don't understand how to convert the scale value into a percentage that ColdFusion can work with. In this case, 0.16 means I want the image to be 16% of the original size. So I'm reducing it by 84%. If the scale was 3.5 then I need to increase the size of the image by 350%.

  1. How do I pass the value from the input into the ImageScaleToFit() function. Passing it in as above using ARGUMENTS.Scale% is giving me syntax errors. For some reason its not being compiled to 0.16%
  2. How do I convert the actual scale value e.g. 0.16 so that it ends up being a correct percentage that ColdFusion can work with to correctly scale the image either up or down?
Solution

  • ImageScaleToFit is looking for the value in pixels. You need to take the original image width and multiple that by your scale value

    <cfset ImageScaleToFit(MyImg, ARGUMENTS.SCALE * originalImageWidth, "", "highestQuality")/>