Resizing Algorithm- Lr5 vs. Photoshop CC?

[rhynetc]

Resizing in Photoshop CC involves lots of algorithmic choices (bicubic smoothing, etc) whereas in Lr 5 the choices are simply to resize or not. How do the algorithms compare, and is there advantage in either method of resizing?

 

[Victoria Bampton]

Lightroom does the same switch between different algorithms behind the scenes, but does it a lot more intelligently. Mark Hamburg said some years ago that in most cases Lightroom will do a better job.

 

[rhynetc]

Thanks, Victoria.

 

[Mark Sirota]

To be specific: Lightroom uses an adaptive bicubic algorithm, similar to bicubic/bicubic smoother/bicubic sharper, but rather than just three variations it is continuously variable. Where it is along the smoother/sharper continuum is automatically selected based on the original and target dimensions.

Lightroom also resizes in linear space (before gamma correction) when working on raw files.

In most cases Lightroom should be able to do a better job for these two reasons, though whether the difference is actually visible is an exercise left to the reader.

 

[rhynetc]

Thanks, Mark.

 

[Denis de Gannes]

To be specific: Lightroom uses an adaptive bicubic algorithm, similar to bicubic/bicubic smoother/bicubic sharper, but rather than just three variations it is continuously variable. Where it is along the smoother/sharper continuum is automatically selected based on the original and target dimensions.

Lightroom also resizes in linear space (before gamma correction) when working on raw files.

In most cases Lightroom should be able to do a better job for these two reasons, though whether the difference is actually visible is an exercise left to the reader.

The thing here is you do not ever see the effects of the Lightroom resizing since that happens automatically when the file is being sent to the printer. So to see the results you have to do the print. Trying to judge print quality on screen is almost futile, if the print is relatively large. If the print is 20" X 30" and Lightroom has to resize to 720 PPI for the say Epson Print Driver try actually creating the actual file at that resolution. Huge file. Try viewing it on your computer monitor your system has to resize the data to display.!!!