batch change exposure by delta

[fraize]

hi, 

my pictures are often underexposed. when I print them, the result is often much darker than on screen.

I'd like to apply a +0.5 exposure to all pictures of a catalogue. not to give them all the same absolute exposure, but to give them an addtional +0.5 exposure on each.

I now that in library / quick development, I can add such relative exposure to a picture (right arrow). 

but It doesn't apply to multiple selection.

with "synchronize parameters", I have the opposite problem: it does apply a change to all selected pictures, but not a relative +0.5 exposure (it basically align all exposures).

does anyone know how to do what I'm looking for?

thx.

[Per Berntsen]

If your prints are too dark, your screen is too bright.

Reduce the brightness of your screen to match the prints, or even better, calibrate your monitor with a hardware calibrator, with brightness set to 100 - 120 candela. This will also create a custom monitor profile, which describes your monitor accurately. With an accurate monitor profile, Lightroom will display your images accurately. Then use the correct printing profile for your printer/paper combination, and the prints should be quite close to what you see on screen.

[fraize]

will do, thanks.

but what if I want to correct a large quantity of picutres afterwards (as all of my previous ones were improperly corrected. Is there anyway to do the bath adaptation I mention in my question?

[Jao vdL]

Per is right that you shouldn't do this. You should calibrate your screen correctly and view your prints using good lighting. That said, if you select multiple images and hit the + or - in quick develop, it should apply to all selected images as a relative adjustment as long as you are in grid view

[fraize]

it works !

thanks.

[TheDigitalDog]

This idea of a delta is counter productive. 

First, you don't really know your raws at least, are over or under exposed via LR. It doesn't provide that data. You need to view a raw Histogram via something like RawDigger to nail actual exposure. 

Next, any rendering in LR can appear 'over exposed' or 'under exposed' when the source data may not be because of the current rendering settings. Below is a good primer about this from Jeff Schewe to look over. 

If you calibrate the display to actually match a print, they match and the print doesn't look 'too dark' compared to the print. 

See:

Why are my prints too dark?

High resolution: http://digitaldog.net/files/Why_are_my_prints_too_dark.mp4

Low resolution: https://youtu.be/iS6sjZmxjY4

Schewe article on Exposure: 

http://schewephoto.com/ETTR/

[Eric Pec]

No, I am sorry. Interesting approach but I do not know how to do this.

Best Regards
Eric Pecquerie
Sent from my iPad Pro

[Bob Somrak]

 Dont know how to do what?