the Camera Screen
exposure correctly using the LCD screen."
need to start with a calibrated camera screen
In order to correctly assess exposure when shooting on location. This
is a simple process
but can often be overlooked. Here is a quick guide.
1. Start by setting your camera picture style
(sometimes called NATURAL).
If you are
shooting RAW this has no effect on your final image as picture styles
overruled by Lightroom or Photoshop anyway. Set the white balance to AUTO white
- again, this has no effect on the final selections made when
setting on the camera - don’t use RAW. Fit a
standard lens, step outside and take a picture of an average scene.
be your garden, car park, whatever.
3. Download the picture
to your desktop on your computer and insert the
memory card back into the camera. Open the jpg in Photoshop and view it
hardware calibrated monitor. Press play on the camera and
two images. Zoom into 100% on camera and scoot around the picture
of highlight and shadow areas. If the picture on the camera seems
darker than the one on your computer screen, enter the menu system
brightness and adjust to taste.
your selection is correct by comparing the two images again and
you should now be able to accurately assess exposure using your camera
Switch your camera back to RAW if that’s your normal shooting system
good to go.
The reason you can’t use RAW to do the same process is that Lightroom
Photoshop builds its own interpretation of the RAW data and to some
plays a part in the exposure process. In practice, the differences
negligible, but the image you see on the back of the camera is a camera
jpg so it makes sense to compare this image with a hi-res version of
in-camera processed jpg on your computer screen.
little tweaks like these that make the whole shooting process
easier and give you confidence in your exposure decisions.
picture looks good on the camera screen, it is good.
article by Damien Lovegrove at www.prophotonut.com revised and
updated by John Curgenven. All permissions granted."
shooting in RAW, the histogram shown on the camera’s LCD is based on
the camera processed jpg.
The raw file isn’t actually a picture with distinct image pixel values
so it can’t be represented in a histogram. Each picture pixel has a
value of red, green and blue, whilst each camera pixel has a luminance
value only. So the histogram is created in camera at the same time as
the jpeg preview based on the values in the jpeg. You can confirm this
by selecting different white balance settings and shooting the same
frame several times. The histogram values for each of the colours will
change even though the raw files will be identical.
The histogram is not a very useful tool to asses exposure but it is
brilliant at the post production stage.
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