CODEWITHSUNDEEP
performanceimagecoldfusionresizecoldfusion-9
Seybsen
Seybsen

Reputation: 15581

Proportional image resize in Coldfusion 9

I have a function which should resize all images in given folders (I don't know exactly how much, but I guess 2500+) and save them to a diffrent folder:

<CFSET base = expandpath("./images") />
<CFSET folders = listtoarray("folder1,folder2") />
<CFLOOP array="#folders#" index="folder">
  <CFDIRECTORY name="qImages" directory="#base#/#folder#/big/" action="list" listinfo="name" type="file" filter="*.jpg" />
  <CFLOOP query="qBilder">
    <CFIMAGE action="resize" height="" width="320" source="#base#/#folder#/big/#name#" destination="#base#/#folder#/#name#" overwrite="yes" />
  </CFLOOP>
</CFLOOP>

I wonder how to do this more efficient than I do?! I read that in CF there are 17 different algorithms for resizing images. Which would be the most performant one with a good mix of image quality and speed?

Upvotes: 1

Views: 1208

Answers (2)

Mike Causer
Mike Causer

Reputation: 8314

Set your interpolation to "highestPerformance" for images <= 100x100 pixels and "highestQuality" or "lanczos" for the rest. If you are creating .jpgs the default quality is 0.75 which means 75%. For tiny images, drop this to 0.5 or less for quick low quality images.

If you want a proportional resize, provide imageResize() with a width or height, but not both.

http://cfquickdocs.com/cf9/#imageresize

Upvotes: 1

Henry
Henry

Reputation: 32905

You may test the performance of imageResize() first. As jan said, play with the "interpolation parameter" to get your quality vs speed. If it is proven too slow / too ugly for you, use ImageMagik

Upvotes: 1

Related Questions