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Old August 12th 14, 03:52 PM posted to rec.photo.digital
Sandman
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Posts: 5,467
Default Lightroom vs. Apertu Curves

In article , Floyd L. Davidson wrote:

Sandman:
Here's an example of a feature I'm missing in Lightroom.


I use curves extensively, it's the holy grail of exposure editing.
If you're not using it, start using it!


A curves tool does not edit exposure


Captain literal strikes again.

What you want to adjust, for the purposes stated, are brightness and
contrast.


Then you didn't understand the purpose stated. No surprise there, Floyd.

It shows a larger spectrum of image data than can be displayed on
your monitor, i.e. a higher dynamic range. This is only populated
if you're shooting with RAW files of course. You then have more
bits of image data than JPG or your display can show. Using this,
I can move the qhite point *up*:


It is shot directly into the sun! There is no way to avoid some
areas of clipped whites.


Good input, if the question was how to avoid data clipping when taking
pictures directly into the sun.

When processing the RAW image you can use brightness and contrast to
set the points in the raw sensor data that become absolute white
(255) and absolute black (0) in the RGB image (whether that is saved
as a JPEG or something else). When editing the RGB image you will
never have access to whatever the raw sensor had that was whiter or
blacker. It's gone at that point.


Captain Obvious strikes as well.

Other formats will have greater dynamic range than a JPEG, and at
least some of the shadows can be pulled up.


You don't say, Floyd? You have any more basic image knowledge to share that
everyone already knows about?

Sandman:
Anyone knows if I've missed something?


A bare bones realization of what each program is doing. And a
misconception of what a curves tool does.


So basically you understood nothing. Again, no surprise there.


--
Sandman[.net]