Since Lightroom is so good, what do you use Photoshop for?

Started 8 months ago | Discussions thread
Dave Stott
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Re: Since Lightroom is so good, what do you use Photoshop for?
In reply to soloryb, 8 months ago

soloryb wrote:

Robgo2 wrote:

soloryb wrote:

Actually, if you work in layers, never altering the background layer, Photoshop is non-destructive as well. Files are much larger, but that is another issue.

If you flatten the layers before printing you can do some pixel destruction. Wouldn't that result in a reduction in print quality if there were many layers involved?

Firstly, you should always make a duplicate image for printing, leaving the master copy intact. Secondly, I am not aware that flattening the print file causes any degradation of print quality, even though pixels are altered permanently. Finally, are we sure that Lightroom does not create a hidden converted file as part of the printing process? If so, that would involve altering pixels.

Rob

I'm fairly certain that any edits that PS does to an image causes some image degradation as it alters the actual pixels. Flattening just consolidates all those edits, which means that the image pixels have been altered and therefore degraded. I've read (and also always followed this practice) that you should flatten all your layers before sending the image to the printer. That means that after editing in PS and then printing, you are working with a slightly degraded image. The greater the number of edits, the more this is true. I really don't know at what point this makes a difference in the final print.

I know that LR printing involves a complex interpolation algorithm, but this is the first time I've heard anybody say that it might alter pixels during this process and then affect the quality of the final output. One of the biggest selling points for LR is that it never alters pixels like PS can. Could you please say where you got this information?

soloryb

This is a strange dialogue.   Lightroom doesn't alter pixels 'cos a RAW file doesn't have any pixels.  ACR likewise doesn't create a pixel based file till you exit it.

When you output an image from Lightroom it takes the RAW file,  applies the Lightroom edits,  and produces a pixel based file.   You may see it,  if you Export it,  or Publish it, or pass to another editor,  or you may not if it is headed for a printer.   But it is most certainly there.

Dave

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