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Re: Image scaling

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Re: Image scaling

Subject: Re: Image scaling
From: Adam Knight <email@hidden>
Date: Mon, 7 Jan 2008 11:41:54 -0600

On Jan 4, 2008, at 5:51 PM, John Stiles wrote:

I'd suggest that if you are trying to demonstrate an image's sharpness, a lossy format like JPG is not the format to use :)

FWIW it's entirely possible that Flickr is explicitly running a sharpening filter on the image before scaling it down. I am not 100% sure but I am fairly positive that Google's photo service (Picasa) does this when you scale down images from within its iPhoto plugin.

That's actually exactly what's happening. I did some searching and they boost saturation and run a sharpness filter on the thumbnails. So, using Core Image, I did the same things after running the Lanczos filter and managed to get a decent result. Thanks for the lead. :)

Adam Knight
Co-Founder; CTO
email@hidden

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References:  
  >Image scaling (From: Adam Knight <email@hidden>)
  >Re: Image scaling (From: Adam Knight <email@hidden>)
  >Re: Image scaling (From: John Stiles <email@hidden>)




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