• Welcome to the Lightroom Queen Forums! We're a friendly bunch, so please feel free to register and join in the conversation. If you're not familiar with forums, you'll find step by step instructions on how to post your first thread under Help at the bottom of the page. You're also welcome to download our free Lightroom Quick Start eBooks and explore our other FAQ resources.
  • Stop struggling with Lightroom! There's no need to spend hours hunting for the answers to your Lightroom 6 questions. All the information you need is in Adobe Lightroom 6 - The Missing FAQ!

    To help you get started, there's a series of easy tutorials to guide you through a simple workflow. As you grow in confidence, the book switches to a conversational FAQ format, so you can quickly find answers to advanced questions. When you upgrade to subscription, there's also a Lightroom Classic version available.
  • It's Lightroom update time again! Color Grading and improved zoom across the whole Lightroom family, plus graphical watermarks for the cloud-based Lightroom apps, as well as the usual new cameras, lens profiles and bug fixes. See this blog post for Lightroom Classic and this blog post for the Lightroom Cloud Ecosystem changes.

Lightroom Interpolation

PatrickC

Active Member
Joined
Jan 30, 2008
Messages
178
Location
UK
Does anyone know how much effort Adobe put in to the interpolation algorithms?

The general rule when interpolating with PS is to only inteerpolate in +1'% increments - as far as I know, this still stands in the latest versions CS3/4. Obviously it isn't possible to do this when exporting from LR. So how good is the LR interpolation? Or do I need to do it in PS if I have to go up by more than 1'%?

Patrick Cunningham
 

Mark Sirota

Senior Member
Joined
Oct 8, 2007
Messages
4,055
Location
Philadelphia, PA, USA
Lightroom Experience
Power User
Some are now questioning the 1'% step approach; I don't think there is widespread concensus either way.

Lightroom 2.3 uses an adaptive bicubic algorithm -- rather than just the three steps that PS provides (smoother, standard, sharper) Lightroom adapts automatically depending on the size of the source and the desired output. It also operates in linear (not gamma-corrected) space rather than on a rendered file, as PS does.

So compared with bicubic in PS, LR should be better. Some images may get better results from other methods, however.

Do some tests and compare, and please report what you find!
 
Joined
Sep 29, 2007
Messages
22,670
Location
Isle of Wight, UK
Lightroom Experience
Power User
Lightroom Version
Cloud Service
Mark Sirota;4'929 said:
Some are now questioning the 1'% step approach; I don't think there is widespread concensus either way.
Last I heard, when Bicubic Smoother and Bicubic Sharper were introduced (CS?), 1'% increments were no longer necessary.
 

ernie

Active Member
Joined
Oct 12, 2007
Messages
390
Location
Little Rock, Arkansas
Lightroom Experience
Intermediate
Lightroom Version
Jeff Schewe in one of the Luminous Landscape videos said not to use the 1'% method anymore. Both bicubic smoother in ps and LR are better.
Question for Mark-what does it mean linear vs gamma corrected space?
 

Mark Sirota

Senior Member
Joined
Oct 8, 2007
Messages
4,055
Location
Philadelphia, PA, USA
Lightroom Experience
Power User
Gamma-corrected space effectively has a contrast curve applied; linear space does not. LR operates on its files before applying the contrast curve, because it works with raw data rather than rendered images.

Did that help?
 

PatrickC

Active Member
Joined
Jan 30, 2008
Messages
178
Location
UK
Thank you all for your contributions. A very useful discussion - I might try running a few comparisons at some point, but we're preparing for an exhibition in Sao Paulo (that's the biggest city in Brazil for those who don't know!), so pretty busy at the moment.

Patrick Cunningham
 

ernie

Active Member
Joined
Oct 12, 2007
Messages
390
Location
Little Rock, Arkansas
Lightroom Experience
Intermediate
Lightroom Version
Yes, I think. Would another way to say it be that linear means untouched raw data? if that is true, then I understand.
Patrick, do you live in Sao Paulo or just there to do the exibition? Our first exchange student we had (93-94) was from there. She still lives there and we email every so often. Big city, but small world, huh.
 

PatrickC

Active Member
Joined
Jan 30, 2008
Messages
178
Location
UK
Sue lived in SP for many years before I met her; we live in England now.

Sao Paulo is a huge city, much larger than New York or London. It is a thriving, modern business centre with huge state of the art shopping centres and striking modern high-rise offices. The traffic is absolutely appalling and I can think of no worse prospect than to live there! I wouldn't want to live in New York either, though for some mysterious reason I have ended up living in the suburbs of London. Do a search for Sao Paulo on our site (though the pics there are fairly old).

Six degrees of sparation!

Patrick
 
Joined
Oct 8, 2007
Messages
5,522
Location
London
Lightroom Experience
Power User
Victoria Bampton;4'934 said:
Last I heard, when Bicubic Smoother and Bicubic Sharper were introduced (CS?), 1'% increments were no longer necessary.
Its benefit nowadays is to provide the nice warm feeling that you're doing something.

John
 
Top